2026-05-20T16:50:07Z https://yabu.me Tube🌿Time https://yabu.me/npub1xvgjz7sfg3le9r5etgx02vvwttwqk6mhm3pm5yldua2wgf0hz7us7262t2 https://files.mastodon.social/accounts/avatars/109/243/623/902/756/898/original/693ad7d7e2e93a5e.png https://files.mastodon.social/accounts/avatars/109/243/623/902/756/898/original/693ad7d7e2e93a5e.png https://yabu.me/nevent1qqs889460tmdffyxglfsycmlx2784f3vw4ncq5q87gvtp36q8vsa6tqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj9tzyrf found a DE-3 in the wild, folks<br/> <img src="https://files.mastodon.social/media_attachments/files/116/434/960/683/813/105/original/f251a1de2131f2df.png"> <br/> 2026-04-20T03:42:03Z https://yabu.me/nevent1qqsz99ge2ymxcn83jfgsp6xpwlfjfunumdvxplcw6a0efpy90c3p6yszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjm6zzec SPACE BALLS!<br/> <img src="https://files.mastodon.social/media_attachments/files/116/383/243/720/527/085/original/6cc836f0d463c603.png"> <br/> 2026-04-11T00:29:39Z https://yabu.me/nevent1qqspet66xasaymjq8jeq42t6py9ydw79jprcdut4kccgvpl758qujwqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjgdlm59 congratulations to the Artemis crew (and team) for a successful splashdown and for inventing the most complex way to travel from Florida to California. there&#39;s a boat involved, too 2026-04-11T00:11:53Z https://yabu.me/nevent1qqsrf6ykkhsug04ydk4pxu7whzkmsyw38gzd5nqm5x043xj33w6y3lszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj6tujkp do you have an old IBM 5151, 5153, or 5154 monitor with crumbling rubber feet? here&#39;s a replacement option for you. 🧵<br/> <img src="https://files.mastodon.social/media_attachments/files/116/315/383/564/908/306/original/8709eb99fa8e5405.jpg"> <br/> <img src="https://files.mastodon.social/media_attachments/files/116/315/383/661/307/921/original/487d5c33e664b5b5.jpg"> <br/> 2026-03-30T00:51:46Z https://yabu.me/nevent1qqsrpyzfrqyu3w64pxy4cstczryj2avpejvw8t4mhl6zfpnsfzrt2gszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjhh5gn4 In reply to <a href='/nevent1qqsxqdfpn0c5kuu27gnx3qu873p4czt38xfryg0xqrwe2ka6xnzsx5qa7nshq'>nevent1q…nshq</a><br/>_________________________<br/><br/>bam! and it&#39;s in color now.<br/> <img src="https://files.mastodon.social/media_attachments/files/116/264/783/753/494/396/original/de7fdb55eb53a3f9.png"> <br/> 2026-03-21T02:24:00Z https://yabu.me/nevent1qqsxqdfpn0c5kuu27gnx3qu873p4czt38xfryg0xqrwe2ka6xnzsx5qzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjuu5ze6 In reply to <a href='/nevent1qqsd7k7madknlxr489l9gy02f7naej8fsq26dtf7sfm00f5mjvhqwkqdvra7z'>nevent1q…ra7z</a><br/>_________________________<br/><br/>ok figured out how to boot the system with the NVRAM issue. hit STOP-A, then type n, then type &#34;boot disk&#34; lol they simplified it so i don&#39;t need the whole sd(0,1,0) nonsense.<br/> <img src="https://files.mastodon.social/media_attachments/files/116/264/779/835/804/053/original/e744ca2fcee81fba.png"> <br/> 2026-03-21T02:23:19Z https://yabu.me/nevent1qqsd7k7madknlxr489l9gy02f7naej8fsq26dtf7sfm00f5mjvhqwkqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjaxrs3w In reply to <a href='/nevent1qqs2r6fvr4gas4c4vwka0nmyr6cw44ruwt5yc4yf3xz6dqnuzsmcd2qhfw8hr'>nevent1q…w8hr</a><br/>_________________________<br/><br/>so someone pointed out that the two crossed out names on the TurboGX card, CURTIS and CHRIS M, left Sun to found Nvidia!<br/> <img src="https://files.mastodon.social/media_attachments/files/116/264/593/110/140/163/original/6f048a9c69587b2f.png"> <br/> 2026-03-21T01:35:49Z https://yabu.me/nevent1qqs2r6fvr4gas4c4vwka0nmyr6cw44ruwt5yc4yf3xz6dqnuzsmcd2qzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjzprxd7 In reply to <a href='/nevent1qqs9s6pmwre3z8577t7kkkfmk89t0fxtr6fq72lglek6cgyrhw4jskcxklvnw'>nevent1q…lvnw</a><br/>_________________________<br/><br/>anyway, setting up a new video card on a Sun machine is super easy and total jumperless! all you have to do is burn a new EPROM and solder some wires, then update your NVRAM config, and presumably some OS shenanigans, maybe recompiling a kernel or something lol. 2026-03-21T01:14:43Z https://yabu.me/nevent1qqs9s6pmwre3z8577t7kkkfmk89t0fxtr6fq72lglek6cgyrhw4jskczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjuylcq6 In reply to <a href='/nevent1qqsqk2csjup5p4ajdfgucqlyh05eh8hf27lnm7djrwcssmfr4n7vvtss40sps'>nevent1q…0sps</a><br/>_________________________<br/><br/>i should boot an operating system, but i stole the SCSI2SD in this box for use with another system and i&#39;m too lazy to find it. maybe the Amiga 1000? 2026-03-21T01:13:29Z https://yabu.me/nevent1qqsqk2csjup5p4ajdfgucqlyh05eh8hf27lnm7djrwcssmfr4n7vvtszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjjugzup In reply to <a href='/nevent1qqsx60v058y6fcjzw96vdg4eeyhfwpf0q4cjedzv8w7kual8x39slhcz3hdkp'>nevent1q…hdkp</a><br/>_________________________<br/><br/>oh yeah! it boots in color now. just check out that cool 3D-rendered SUN logo with colorful shapes.<br/> <img src="https://files.mastodon.social/media_attachments/files/116/264/497/500/293/766/original/9e93d51ad7cffca4.png"> <br/> 2026-03-21T01:12:45Z https://yabu.me/nevent1qqsx60v058y6fcjzw96vdg4eeyhfwpf0q4cjedzv8w7kual8x39slhczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjx773rh In reply to <a href='/nevent1qqsfytmqryf6ds4pvgsde7ue4yzaq9rsggewtqmuk8wlvcghau7tqcqmrz2as'>nevent1q…z2as</a><br/>_________________________<br/><br/>my 13W3 Video Snake Oil (<a href="https://github.com/schlae/13W3">https://github.com/schlae/13W3</a>) lets you wire up the adapter in a number of ways. on a hunch, let&#39;s try and wire pin 5 (CSYNC) up to the HSYNC on the VGA video connector.<br/> <img src="https://files.mastodon.social/media_attachments/files/116/264/491/255/659/517/original/37e81938cb69544b.png"> <br/> 2026-03-21T01:10:21Z https://yabu.me/nevent1qqsfytmqryf6ds4pvgsde7ue4yzaq9rsggewtqmuk8wlvcghau7tqcqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj7h79um In reply to <a href='/nevent1qqs8nsd4zuux4we9rep6mc5y0t7eyqwgk2pj328kjsqdg5mq3e5tzpc3aakra'>nevent1q…akra</a><br/>_________________________<br/><br/>yeah looks like the color card works (this is the green video channel) but i will need a way to convert the sync signals to this monitor.<br/> <img src="https://files.mastodon.social/media_attachments/files/116/264/459/227/424/720/original/2d7565a13ec70940.png"> <br/> 2026-03-21T01:01:43Z https://yabu.me/nevent1qqs8nsd4zuux4we9rep6mc5y0t7eyqwgk2pj328kjsqdg5mq3e5tzpczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjepw3n7 In reply to <a href='/nevent1qqs0awu9604ggjrejnkpy0zwk0lhvq7d8jhqzjfjada80pfkj5p6dlssp8yf2'>nevent1q…8yf2</a><br/>_________________________<br/><br/>with the monochrome video card, the new PROM boots up. NVRAM is invalid since it probably remaps everything, but at least it is smart enough to recover the MAC address. i was expecting to have to reconfigure the whole thing manually, because Sun.<br/> <img src="https://files.mastodon.social/media_attachments/files/116/264/454/726/008/721/original/dbd8322c1800038c.png"> <br/> 2026-03-21T01:00:45Z https://yabu.me/nevent1qqs0awu9604ggjrejnkpy0zwk0lhvq7d8jhqzjfjada80pfkj5p6dlszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjc35yl2 In reply to <a href='/nevent1qqsfwtjrzk7kue4msyjd5yx5kxyu0slcd7sn3j6gcdzxg2j3praclqs9arx8c'>nevent1q…rx8c</a><br/>_________________________<br/><br/>new PROM programmed and ready to go.<br/> <img src="https://files.mastodon.social/media_attachments/files/116/264/452/650/359/781/original/af07ccef17a2677a.png"> <br/> 2026-03-21T00:59:36Z https://yabu.me/nevent1qqsfwtjrzk7kue4msyjd5yx5kxyu0slcd7sn3j6gcdzxg2j3praclqszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj5ny36c In reply to <a href='/nevent1qqsts9jcas2lsln247cg6892dymant8e6z2hg5g382tvzpuhg70suesjjd47j'>nevent1q…d47j</a><br/>_________________________<br/><br/>looks like The Retro Web has a PROM image i can use.<br/><a href="https://theretroweb.com/motherboards/s/sun-sparcstation-1">https://theretroweb.com/motherboards/s/sun-sparcstation-1</a> 2026-03-21T00:38:46Z https://yabu.me/nevent1qqsts9jcas2lsln247cg6892dymant8e6z2hg5g382tvzpuhg70sueszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjdazp7u In reply to <a href='/nevent1qqsd8d8rusuqqqet7qug7xmsxuucfdkpqmk52xxzeemz0gjtx9sq2rqptj4gk'>nevent1q…j4gk</a><br/>_________________________<br/><br/>PROM is 525-1043-07, which is for a SPARCstation 1, not a 1+. uhh, looks like i actually own a SPARCstation 1 but the lid has the wrong logo on it!<br/> <img src="https://files.mastodon.social/media_attachments/files/116/264/365/688/732/714/original/796ae0fd04bcd233.png"> <br/> 2026-03-21T00:38:03Z https://yabu.me/nevent1qqsd8d8rusuqqqet7qug7xmsxuucfdkpqmk52xxzeemz0gjtx9sq2rqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj70enqr In reply to <a href='/nevent1qqsww3344lfchlshlvmm8t4pzl6dl7m8dl86vnw6vd0cnne9uduyrgq5k7wjz'>nevent1q…7wjz</a><br/>_________________________<br/><br/>could be an old PROM version. the previous screen shows ROM Rev 1.1, but here it looks like I need PROM 2.0 or higher.<br/> <img src="https://files.mastodon.social/media_attachments/files/116/264/360/698/521/843/original/24f2529e2fcd6dc8.png"> <br/> 2026-03-21T00:36:33Z https://yabu.me/nevent1qqsww3344lfchlshlvmm8t4pzl6dl7m8dl86vnw6vd0cnne9uduyrgqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjvp7e23 In reply to <a href='/nevent1qqs88wg37kdwfkj85w0x6wlyu7fhtwzhd46zp4x9ph6ttjgf0qad2ssr7whcy'>nevent1q…whcy</a><br/>_________________________<br/><br/>quick sanity check with the old video card, and that still works OK.<br/> <img src="https://files.mastodon.social/media_attachments/files/116/264/356/201/263/522/original/a8108273f76f2ba7.png"> <br/> 2026-03-21T00:35:21Z https://yabu.me/nevent1qqs88wg37kdwfkj85w0x6wlyu7fhtwzhd46zp4x9ph6ttjgf0qad2sszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjx2m9n3 In reply to <a href='/nevent1qqs25hw3svd7xzw0vmv5dcj0q22gf0sklp74w85728gzsq3xttfpnmqgd7ze8'>nevent1q…7ze8</a><br/>_________________________<br/><br/>that wasn&#39;t it either. no change. 2026-03-21T00:34:29Z https://yabu.me/nevent1qqs25hw3svd7xzw0vmv5dcj0q22gf0sklp74w85728gzsq3xttfpnmqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjk77a2g In reply to <a href='/nevent1qqsdjqv5hyz29vy2ncjxsqu9k865kfl22gwf9w7sak2dcl6jj0ec5fguvgzdu'>nevent1q…gzdu</a><br/>_________________________<br/><br/>no CSYNC comes out. checked it with a scope. OK, maybe the monitor sense pins being floating is a problem? i think it should still come up even with nothing (1152x900 66Hz).<br/> <img src="https://files.mastodon.social/media_attachments/files/116/264/351/657/604/022/original/527a1d86fce0cbe8.png"> <br/> 2026-03-21T00:34:08Z https://yabu.me/nevent1qqsdjqv5hyz29vy2ncjxsqu9k865kfl22gwf9w7sak2dcl6jj0ec5fgzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj9rjm2v In reply to <a href='/nevent1qqswyxnk488gn4h8zc2jqcan57pvly5ll45kgrv39ugqtr0tkfxa7eg4vdqc9'>nevent1q…dqc9</a><br/>_________________________<br/><br/>hmm, maybe my adapter board (configured for H/V sync) will not work with this card that puts out CSYNC only.<br/> <img src="https://files.mastodon.social/media_attachments/files/116/264/344/360/100/393/original/fa8aebd9da1afb27.png"> <br/> 2026-03-21T00:32:34Z https://yabu.me/nevent1qqswyxnk488gn4h8zc2jqcan57pvly5ll45kgrv39ugqtr0tkfxa7egzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjtzkjcs In reply to <a href='/nevent1qqsdjpcena6tf8emecfw28gcsj22724qw8trp3qz46p99qu8wftgtfswc8csv'>nevent1q…8csv</a><br/>_________________________<br/><br/>aaand i get a black screen. that&#39;s odd. 2026-03-21T00:31:00Z https://yabu.me/nevent1qqsdjpcena6tf8emecfw28gcsj22724qw8trp3qz46p99qu8wftgtfszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjl5xc6u In reply to <a href='/nevent1qqs0rkycpmqwfrxj93p89c8578v5uhjc4tj4aqs0smpnep9yuzxnclcx3jgpy'>nevent1q…jgpy</a><br/>_________________________<br/><br/>looks like the people who designed it left their names on the circuit board. i guess some of them are crossed out because they left the team?<br/> <img src="https://files.mastodon.social/media_attachments/files/116/264/327/894/953/122/original/403355131d5b8814.png"> <br/> 2026-03-21T00:30:07Z https://yabu.me/nevent1qqs0rkycpmqwfrxj93p89c8578v5uhjc4tj4aqs0smpnep9yuzxnclczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjxlaqcy In reply to <a href='/nevent1qqsw0kqwlq98gjvs7zcl0jwlcuey2pwfz5sarn2zk926cdf5uuc68lcnyd7ll'>nevent1q…d7ll</a><br/>_________________________<br/><br/>the new card is a TurboGX so i can get color graphics.<br/> <img src="https://files.mastodon.social/media_attachments/files/116/264/324/937/991/795/original/7fee90db5a7260a5.png"> <br/> 2026-03-21T00:27:20Z https://yabu.me/nevent1qqsw0kqwlq98gjvs7zcl0jwlcuey2pwfz5sarn2zk926cdf5uuc68lczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjwguv2s time to upgrade the video card in my Sun SPARCstation 1+.<br/> <img src="https://files.mastodon.social/media_attachments/files/116/264/320/980/485/697/original/7f6796d628af4fd6.png"> <br/> 2026-03-21T00:26:29Z https://yabu.me/nevent1qqstvnr80a5pvkl67gmjtf0mw5mah7dqmtarz0llulshtp6pezvuxfqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmja9a4kp it&#39;s another early morning Silicon Valley Electronics Flea Market! <br/><br/>West Valley College. it&#39;s on Saturday again, but we have to share the parking lot with a farmers market now for some reason.<br/> <img src="https://files.mastodon.social/media_attachments/files/116/227/693/934/558/347/original/253de9998822d3fe.jpg"> <br/> 2026-03-14T13:11:57Z https://yabu.me/nevent1qqsqy8v8ypnp2dp5tgj8f7qtxhw68n6q6g443l7snq4d8e82l3x5ynczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjynwgt6 In reply to <a href='/nevent1qqs0ywhjwutkz52plwskfda9p7y9yg93pkn65yx6pfndgkp7uuxz3ggzd3uv6'>nevent1q…3uv6</a><br/>_________________________<br/><br/>iirc roy had training as a draftsman. 2026-02-28T03:36:41Z https://yabu.me/nevent1qqs94mxaf0peskarzhn8k3dxesmslpurqyhka95pj8av2j56mvhdz7gzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjlhspyz In reply to <a href='/nevent1qqst4ugr400tfxepka5wp8zjcq8hsq0zghkcuwg354r5rcnjesha8jskljnr8'>nevent1q…jnr8</a><br/>_________________________<br/><br/>nope 2026-02-28T03:05:21Z https://yabu.me/nevent1qqspmq447qdfh6af66hhqnesdjw5xkc9sv2xj5q29chppdsa4vys3hszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjvn0rhw a bad Leisure Suit Larry game? no, it&#39;s Roy Lichtenstein in 1973.<br/> <img src="https://files.mastodon.social/media_attachments/files/116/145/968/182/728/388/original/6ab0c52a34bb061d.png"> <br/> 2026-02-28T02:47:31Z https://yabu.me/nevent1qqsfkryxumj205dl8p9rfnmsufc7yft6w42vdu7vg5fy2r9l8hqycagzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjafp5tf RE: <a href="https://social.treehouse.systems/@lillian/116077971040259901">https://social.treehouse.systems/@lillian/116077971040259901</a><br/><br/>i uhh was involved in designing a device that did this. not my decision and i pushed back pretty hard, but was overridden. it ended up blowing up someone&#39;s phone. 2026-02-16T06:43:02Z https://yabu.me/nevent1qqsz8v4qz5mu72tz5nhqe5lyhqyemzjyapcg0ekeyk6zjrtndkvednszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjldw206 today at the Computer History Museum we adjusted the read timings on the 1401 computer&#39;s 1402 card reader. to do this, we load a deck of &#34;555&#34; timing cards, which have the number 5 punched in columns 1-3 and 78-80. seems that 555 really is a magic number for timers...<br/> <img src="https://files.mastodon.social/media_attachments/files/115/975/308/748/472/971/original/0896cbf4cbcda98d.png"> <br/> 2026-01-28T23:29:28Z https://yabu.me/nevent1qqs84jvx5hynhtc9t8nhurw99pwqsudcvh9tclyl9vtjsver6xvddqqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjhlmu0u In reply to <a href='/nevent1qqsvp65q9u2pehww89lw72d7v5yc5w926g2y5mg9j0czlch5lh70cvq82pvdm'>nevent1q…pvdm</a><br/>_________________________<br/><br/>live again right now! 2025-12-24T18:48:18Z https://yabu.me/nevent1qqsvp65q9u2pehww89lw72d7v5yc5w926g2y5mg9j0czlch5lh70cvqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjaxxmw3 now streaming: reverse engineering!<br/><a href="https://www.twitch.tv/tubetimeus">https://www.twitch.tv/tubetimeus</a><br/> <img src="https://files.mastodon.social/media_attachments/files/115/754/450/892/751/834/original/ad4a65dfe1c0dd13.png"> <br/> 2025-12-20T23:19:33Z https://yabu.me/nevent1qqsy773lfjv4u27zxclvlsg4nh2efql6ntqn7nztlmax5df8w2k3raszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjx760dx In reply to <a href='/nevent1qqs8gaex2nqcxupdzvpmedngg3tlqzlhc2nq5dv7fz5kl70x97vtr7stcf46v'>nevent1q…f46v</a><br/>_________________________<br/><br/>oh no<br/> <img src="https://files.mastodon.social/media_attachments/files/115/741/254/180/100/286/original/77de27259f46af7d.png"> <br/> 2025-12-18T15:23:07Z https://yabu.me/nevent1qqs8gaex2nqcxupdzvpmedngg3tlqzlhc2nq5dv7fz5kl70x97vtr7szyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjumnnf8 In reply to <a href='/nevent1qqstg7k7yn65wa4fwvrvja4s2zvshd6n4xc8f2grygacc7vhx4lf0dggrtuhz'>nevent1q…tuhz</a><br/>_________________________<br/><br/>pulled the chip off the other card. uh that entire via was corroded away, even part of the trace on the other side. no wonder I couldn&#39;t find any copper.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/733/070/915/869/649/original/6117181c272a8aaf.jpg"> <br/> 2025-12-17T04:43:36Z https://yabu.me/nevent1qqstg7k7yn65wa4fwvrvja4s2zvshd6n4xc8f2grygacc7vhx4lf0dgzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjfnntv5 In reply to <a href='/nevent1qqsdqkkvyy8ewv20zsn7mcgz3rt29jgsv0wlujez42qnu5awjntcd5qsg4826'>nevent1q…4826</a><br/>_________________________<br/><br/>that worked! the card passes all the self tests now.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/647/745/267/446/762/original/8f4a7e954fe634f5.png"> <br/> 2025-12-02T03:03:31Z https://yabu.me/nevent1qqsdqkkvyy8ewv20zsn7mcgz3rt29jgsv0wlujez42qnu5awjntcd5qzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjpqzv57 In reply to <a href='/nevent1qqsf869e95zquq50cvu0jvnyye78mf5lm3af45e2s78c4gcnyqpt6ksx4mek6'>nevent1q…mek6</a><br/>_________________________<br/><br/>quick diagram of the resistor array, a 4816P-B07-000. the comparator output goes to pins 1, 3, 5, and 7. pins 2, 4, 6, and 8 are grounded (so the 670 ohm resistors go to ground). the outputs to the FPGA seem to be on pins 10, 12, 14, and 16. the remaining pins go...elsewhere. i suspect it&#39;s some sort of termination network that might do some level shifting. perhaps the comparators have ECL outputs or something.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/647/730/969/937/392/original/de42954f68c96163.png"> <br/> 2025-12-02T03:01:50Z https://yabu.me/nevent1qqsf869e95zquq50cvu0jvnyye78mf5lm3af45e2s78c4gcnyqpt6kszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj0uk80z In reply to <a href='/nevent1qqsr8xemk76v5p8t0wvukr97c3pszsqqzc89yeu27dm32cszwl5pl8cgz5djk'>nevent1q…5djk</a><br/>_________________________<br/><br/>it was easier to just remove the resistor array completely so i could clean up the pads and the resistor leads.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/647/728/043/078/083/original/ddcbb83d9ccd9317.png"> <br/> 2025-12-02T02:58:28Z https://yabu.me/nevent1qqsr8xemk76v5p8t0wvukr97c3pszsqqzc89yeu27dm32cszwl5pl8czyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj6fh6tt In reply to <a href='/nevent1qqsfxxpp9qqqmyk5dydww6wvsl75jfv2lk3quk3c94y7kxcdjtc7knglsphq0'>nevent1q…phq0</a><br/>_________________________<br/><br/>yeah there are corroded solder joints on that resistor array. at least 1 high resistance connection.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/647/725/034/917/437/original/ed359a7f68ec1055.png"> <br/> 2025-12-02T02:57:49Z https://yabu.me/nevent1qqsfxxpp9qqqmyk5dydww6wvsl75jfv2lk3quk3c94y7kxcdjtc7kngzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjw79ljx In reply to <a href='/nevent1qqsgcgfrtl8vde74lfnfznx2mzvkpf987nzfuk030wkneddeeuwksxsfkdq35'>nevent1q…dq35</a><br/>_________________________<br/><br/>pod1 and pod2 are on the connector nearest the edge of the board (middle connector is for 3 and 4). pod1 chips are on the bottom of the board, pod2 chips on the top. and bit 2 is on this wire coming off the connector. but i suspect a problem with the resistor array tied to the outputs of the comparator chip.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/647/718/687/491/608/original/52ab6fb6123a25dc.png"> <br/> 2025-12-02T02:57:05Z https://yabu.me/nevent1qqsgcgfrtl8vde74lfnfznx2mzvkpf987nzfuk030wkneddeeuwksxszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjxrc6mp In reply to <a href='/nevent1qqsvd76l7jm9fepvjddrmga33affrk8ht2ms99wyf34elmlhmxn6djs73h5zv'>nevent1q…h5zv</a><br/>_________________________<br/><br/>whoops, spoke to soon. it fails 1 of the comparator tests. now i just have to figure out which one it is physically on the board...<br/> <img src="https://files.mastodon.social/media_attachments/files/115/647/711/702/864/783/original/5328f4a451f32859.png"> <br/> 2025-12-02T02:54:24Z https://yabu.me/nevent1qqsvd76l7jm9fepvjddrmga33affrk8ht2ms99wyf34elmlhmxn6djszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj7ssd67 In reply to <a href='/nevent1qqsvv70k0at2mgsczn22we9nqqf6rpxfdzwrctnpv7mjxp9yp8ytpqc3zzpn0'>nevent1q…zpn0</a><br/>_________________________<br/><br/>my hunch that i need the cables plugged in to pass the test might be right. looks like this card works now!!!<br/> <img src="https://files.mastodon.social/media_attachments/files/115/636/145/223/558/145/original/0481829acbb75e1b.png"> <br/> <img src="https://files.mastodon.social/media_attachments/files/115/636/145/762/282/262/original/61245813d7d0bb03.png"> <br/> 2025-11-30T01:53:01Z https://yabu.me/nevent1qqsvv70k0at2mgsczn22we9nqqf6rpxfdzwrctnpv7mjxp9yp8ytpqczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjwq2cuv In reply to <a href='/nevent1qqsrk9xv5y6p3l7j8jv24ls2frzegn7zpkp5w84pgkhhuefzg59qxvsldyt79'>nevent1q…yt79</a><br/>_________________________<br/><br/>well, there&#39;s good news and bad news. my via fix actually worked! but now there&#39;s a problem with the comparators. :(<br/> <img src="https://files.mastodon.social/media_attachments/files/115/636/117/103/871/259/original/4208364e0e263b83.png"> <br/> 2025-11-30T01:45:40Z https://yabu.me/nevent1qqsrk9xv5y6p3l7j8jv24ls2frzegn7zpkp5w84pgkhhuefzg59qxvszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjakhe69 In reply to <a href='/nevent1qqsf7ep48pzr2jc79yc7fn42j2uqa24u3fc9fy7x0ygqfuhe2kpdjscqmfsgj'>nevent1q…fsgj</a><br/>_________________________<br/><br/>here&#39;s what i&#39;m trying to do. the top image is a normal via. you can see this is an 8 layer board, and the via has no connections to inner layers. it just goes straight through. then in the middle image, the gunk has etched out the copper in the top part of the via. in the bottom image, i&#39;ve drilled out the material to expose fresh copper, then jammed a wire in there. there&#39;s a little solder which (hopefully) wetted to the via barrel.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/636/108/291/661/357/original/430cda051d08ad30.png"> <br/> 2025-11-30T01:44:29Z https://yabu.me/nevent1qqsf7ep48pzr2jc79yc7fn42j2uqa24u3fc9fy7x0ygqfuhe2kpdjsczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjap2xlt In reply to <a href='/nevent1qqsqygk565ls5drhxmhjrmjt7rmtt7qq27pfclvqvgs2n67fmjrny6gdv92xa'>nevent1q…92xa</a><br/>_________________________<br/><br/>drilled down until I found copper in the via barrel. I wonder if this will work.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/636/051/108/006/144/original/9a90e91d41806725.jpg"> <br/> 2025-11-30T01:28:54Z https://yabu.me/nevent1qqsqygk565ls5drhxmhjrmjt7rmtt7qq27pfclvqvgs2n67fmjrny6gzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj8we7tq In reply to <a href='/nevent1qqsxy9pyf0muarp8xd3nqe2zg8hskyp5sh6rflvq6z09d6ep7fx2j6sfnr80s'>nevent1q…r80s</a><br/>_________________________<br/><br/>this is why. there&#39;s one via that&#39;s broken. just one. that&#39;s the only thing standing in between me and a working card. I&#39;ll have to excavate to try and find some copper I can solder to.<br/><br/>the trace leading to it is cut so I can check for the ESD diode in the FPGA on the other side of the via to confirm when it&#39;s been reconnected.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/628/521/644/030/042/original/76437da2af28f15e.jpg"> <br/> 2025-11-28T17:36:20Z https://yabu.me/nevent1qqsxy9pyf0muarp8xd3nqe2zg8hskyp5sh6rflvq6z09d6ep7fx2j6szyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjyuhzth In reply to <a href='/nevent1qqsxkmayvs3f2y5tlh594e80zjpj4vtxe8flh3va8vg2nkvpr27dzkgn59gjc'>nevent1q…9gjc</a><br/>_________________________<br/><br/>so it passes all the tests except for the VRAM serial readout tests for one bank (bank 1, choices are bank 0-9). think I know why <br/><br/>(screenshot is from the self test for a different card but you get the idea)<br/> <img src="https://files.mastodon.social/media_attachments/files/115/628/513/667/229/169/original/8358b9d184d36654.jpg"> <br/> 2025-11-28T17:33:30Z https://yabu.me/nevent1qqsxkmayvs3f2y5tlh594e80zjpj4vtxe8flh3va8vg2nkvpr27dzkgzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjur9sw0 In reply to <a href='/nevent1qqsqfymj94jpaynjrr64ed70h9nyd7zjey07u70nqd3y9dhxcjg2ssgdl9ren'>nevent1q…9ren</a><br/>_________________________<br/><br/>still working on this. I&#39;ve fixed a bunch of traces, let&#39;s see if it passes the self test<br/> <img src="https://files.mastodon.social/media_attachments/files/115/628/510/094/681/171/original/f086660ea30ace55.jpg"> <br/> 2025-11-28T17:31:27Z https://yabu.me/nevent1qqsxhnwz5uv9jyttdda2qmgfh4z8fvz54tm3egj0dfldwy5mdfe4rhqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj8cxsm3 ON THE BENCH OF HEALING: this is a &#34;Classic Professional Graphics Display&#34; which is actually a rebadged IBM 5175 PGC monitor.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/585/854/568/147/058/original/dbf6ff96ffe3beab.png"> <br/> 2025-11-21T04:43:31Z https://yabu.me/nevent1qqsqfymj94jpaynjrr64ed70h9nyd7zjey07u70nqd3y9dhxcjg2ssgzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjtheusl In reply to <a href='/nevent1qqspa2shjrpdn2wxwwu0nd95f09y6jnah3nx4scnntf3re5mzsj87gqtdy3rv'>nevent1q…y3rv</a><br/>_________________________<br/><br/>found someone on the eevblog forums who said they reverse engineered a schematic. naturally, they never posted it and then fell off the face of the earth<br/> <img src="https://files.mastodon.social/media_attachments/files/115/569/415/760/132/551/original/09434bfeab27a03e.png"> <br/> 2025-11-18T07:03:11Z https://yabu.me/nevent1qqspa2shjrpdn2wxwwu0nd95f09y6jnah3nx4scnntf3re5mzsj87gqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjldgj0y In reply to <a href='/nevent1qqs0s0jp9vudegnnlfrtjs2amckjrfzn6ze6usp6wc92708jaht8h3ga70j3x'>nevent1q…0j3x</a><br/>_________________________<br/><br/>doing a little digging with a sharp knife. you can see the anti-pad openings in the copper pour on the layer directly underneath. but there&#39;s no copper in the via barrel for me to solder to. it&#39;s all dissolved away.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/568/549/987/867/141/original/71a6f524793862cd.jpg"> <br/> 2025-11-18T03:23:04Z https://yabu.me/nevent1qqs0s0jp9vudegnnlfrtjs2amckjrfzn6ze6usp6wc92708jaht8h3gzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj0v0h48 In reply to <a href='/nevent1qqszzxht5g3mth23kfg2w8cju4zv3hszs5h853mmhymhs65grnt28pq9s4ky3'>nevent1q…4ky3</a><br/>_________________________<br/><br/>welp, this resistor just floated away. the pads and vias are basically destroyed.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/562/629/311/989/225/original/eaf26f0952f022c6.jpg"> <br/> 2025-11-17T02:16:39Z https://yabu.me/nevent1qqszzxht5g3mth23kfg2w8cju4zv3hszs5h853mmhymhs65grnt28pqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjrmejry oh now that&#39;s some corrosion. <br/><br/>(hp 16717a logic analyzer card with the characteristic corrosion caused by the decaying adhesive foam holding the plastic guard slides in place)<br/> <img src="https://files.mastodon.social/media_attachments/files/115/562/613/815/940/058/original/cbfaecf74f0e7e7f.jpg"> <br/> 2025-11-17T02:15:08Z https://yabu.me/nevent1qqspnwtnfrugaq8j0vf0njgrmdh7smgwe579u4n2g7nnupnz47cherczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj2ma70m In reply to <a href='/nevent1qqsxzjrq0f0j8kg9n72ymwjpshrr7dezyaaz0uqjtx9ew8vnulnp9pcxy00z4'>nevent1q…00z4</a><br/>_________________________<br/><br/>what could you make out of a disposable vape without any hardware changes?<br/><br/>* flappy bird game (one button)<br/>* magic 8 ball (magic &#34;vape&#34; ball?)<br/>* &#34;flute&#34; (using pressure sensor)<br/>* temperature data logger with waveform display<br/>* adjustable battery power supply 2025-11-15T19:42:36Z https://yabu.me/nevent1qqsxzjrq0f0j8kg9n72ymwjpshrr7dezyaaz0uqjtx9ew8vnulnp9pczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjnxzmcn In reply to <a href='/nevent1qqsqw8lfv0d9s4hj55087mxnnzhyvudvta6sn7tf2pnkldgkxcxztpch4gvdn'>nevent1q…gvdn</a><br/>_________________________<br/><br/>some fancy ones also have bluetooth and even a touchscreen! (i haven&#39;t reverse-engineered those yet) 2025-11-15T19:40:18Z https://yabu.me/nevent1qqsqw8lfv0d9s4hj55087mxnnzhyvudvta6sn7tf2pnkldgkxcxztpczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjw9a4nn In reply to <a href='/nevent1qqswzvnyvl0kk32h6v8clexrdll63ugwjajx30yuefymzwypk6xy3zssy3hnc'>nevent1q…3hnc</a><br/>_________________________<br/><br/>a typical vape board has<br/>* cortex M0 MCU<br/>* NOR flash IC<br/>* a pushbutton or slide switch<br/>* li-ion battery + charger<br/>* nice LCD display (sometimes LED)<br/>* differential pressure sensor<br/>* coil driver(s) with voltage feedback 2025-11-15T19:39:36Z https://yabu.me/nevent1qqswzvnyvl0kk32h6v8clexrdll63ugwjajx30yuefymzwypk6xy3zszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjsy0q20 In reply to <a href='/nevent1qqsxw6nj2630p3wwqv2wnujrv87ukyz6m4luug4hem0a6s8rypf8zdszeld7j'>nevent1q…ld7j</a><br/>_________________________<br/><br/>many of these vapes bring the ARM SWD lines out through the charging connector&#39;s CC lines. with a simple breakout board and an SWD dongle you can reprogram the firmware.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/555/387/160/518/590/original/3b4e044a9eac51ac.png"> <br/> 2025-11-15T19:35:18Z https://yabu.me/nevent1qqsxw6nj2630p3wwqv2wnujrv87ukyz6m4luug4hem0a6s8rypf8zdszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj38em3y did you know that you can find free Cortex M0 development boards at the side of the road? folks call them disposable vapes but they&#39;re hackable, and i&#39;ve reverse engineered a bunch of them! see <a href="https://github.com/schlae/VapeRE/">https://github.com/schlae/VapeRE/</a><br/> <img src="https://files.mastodon.social/media_attachments/files/115/555/373/156/120/201/original/741b38ada438efe8.png"> <br/> 2025-11-15T19:34:18Z https://yabu.me/nevent1qqs0svp8ujlayh6hj5je69j5qy8krylhe3fd8jxm00dh5g4fdrkg9dszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjg42ae7 here&#39;s a handy guide to electronic components.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/460/904/167/473/588/original/506edaf23c695c6a.png"> <br/> 2025-10-30T03:07:52Z https://yabu.me/nevent1qqs0x0wtjz0xk9ns7e3z409q3k4qrvshncc2jddlauc7vpqvxjqamvczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmja8wlwm My coffee table book, Open Circuits, with beautiful cross-section photos of electronics, is 25% off through the 12th. Use the super-secret discount code &#34;SHOWOFF&#34;. What, you already have the book? BAM--you just thought of a friend who would enjoy a copy.<br/><br/>nostarch.com/open-circuits<br/> <img src="https://files.mastodon.social/media_attachments/files/115/341/631/324/500/943/original/62c640cd21afc3cc.png"> <br/> 2025-10-09T01:34:01Z https://yabu.me/nevent1qqsyxafqklcap7uy26rn0k26fgsvvvytl40tdfpf97sv77vc88jpu5qzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjzdkq3a In reply to <a href='/nevent1qqs058gpkdy6dhhg0cpckdz7gfk8u35wla6ds7xeutpjq7uc83mreqgwzhavz'>nevent1q…havz</a><br/>_________________________<br/><br/>while looking for my alligator/crocodile clip meme, i found this meme as well.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/307/978/975/328/154/original/da4f7dd4b30081f1.png"> <br/> 2025-10-03T02:55:43Z https://yabu.me/nevent1qqs058gpkdy6dhhg0cpckdz7gfk8u35wla6ds7xeutpjq7uc83mreqgzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjs84hfj In reply to <a href='/nevent1qqsx8p3fjxgqy5z2u3wgth3avap532wex5ejlf3r5f26szqxngh8daqj952zr'>nevent1q…52zr</a><br/>_________________________<br/><br/>hmm i guess technically this is an alligator clip because it has the wider jaw<br/> <img src="https://files.mastodon.social/media_attachments/files/115/307/975/298/551/597/original/eb6853da3eb904c2.png"> <br/> 2025-10-03T02:54:50Z https://yabu.me/nevent1qqsx8p3fjxgqy5z2u3wgth3avap532wex5ejlf3r5f26szqxngh8daqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjrwmxqp well this was a challenge to model!<br/> <img src="https://files.mastodon.social/media_attachments/files/115/307/900/466/133/299/original/57b4d274a0c8704f.png"> <br/> 2025-10-03T02:36:35Z https://yabu.me/nevent1qqsf6fdm5nr4cde5cvn89v6kx6rlcjsz70rpwhv7uk7ed97zcuvk9eqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjqmadag In reply to <a href='/nevent1qqs2xg4ywscd9qvhyhlv2jyhqkcww4cx8hylewkhgzm8zsfxmncjj8grausuc'>nevent1q…usuc</a><br/>_________________________<br/><br/>easy enough to replace, and the instrument works now! 2025-09-29T03:37:47Z https://yabu.me/nevent1qqs2xg4ywscd9qvhyhlv2jyhqkcww4cx8hylewkhgzm8zsfxmncjj8gzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj9xdvl7 In reply to <a href='/nevent1qqstawky7znn5yeheq9gvjd79s6ynycxxua5ymda88u33zdpavfujac46x8d2'>nevent1q…x8d2</a><br/>_________________________<br/><br/>and here&#39;s the cap, slightly worse for the wear, after being removed. (the crack was caused by the desoldering process)<br/><br/>it measures ~2K across the terminals. i&#39;ve never seen an encapsulated MLCC ceramic cap fail this way.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/285/486/782/517/921/original/ad3a04f8b592c6bc.png"> <br/> 2025-09-29T03:36:39Z https://yabu.me/nevent1qqstawky7znn5yeheq9gvjd79s6ynycxxua5ymda88u33zdpavfujaczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjqz3gdg In reply to <a href='/nevent1qqs9fgjzzs4lswux78dpz5hmkfe2uuqj2vvged85gxtf7vtuxfcjmrswqsgep'>nevent1q…sgep</a><br/>_________________________<br/><br/>there is only one possible path. the current has to be flowing through this capacitor, 551. i can&#39;t think of anything else.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/285/482/257/348/280/original/3c61d9d6aad0c54d.png"> <br/> 2025-09-29T03:35:09Z https://yabu.me/nevent1qqs9fgjzzs4lswux78dpz5hmkfe2uuqj2vvged85gxtf7vtuxfcjmrszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj3vxkd9 In reply to <a href='/nevent1qqs270tm5d025gf763jmsays7m77suvfe2ajwe9g56d7q0qe2lclpdqk0drjh'>nevent1q…drjh</a><br/>_________________________<br/><br/>so with the transistor pulled, i still measured ~2K resistance between ground and resistor 757. uhh that should be totally isolated! 2025-09-29T03:34:06Z https://yabu.me/nevent1qqs270tm5d025gf763jmsays7m77suvfe2ajwe9g56d7q0qe2lclpdqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjqmyhda In reply to <a href='/nevent1qqs8v85a7nnn68v8ak79h79vnpnwrzfq59ggpr5xq9u0xl4auszaulgrnrwxs'>nevent1q…rwxs</a><br/>_________________________<br/><br/>this is transistor 389. like i said before, i tested it and it is working. but the culprit is indeed in this photo.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/285/465/071/862/885/original/a898cb61f016608c.png"> <br/> 2025-09-29T03:30:34Z https://yabu.me/nevent1qqs8v85a7nnn68v8ak79h79vnpnwrzfq59ggpr5xq9u0xl4auszaulgzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj0s9mpp In reply to <a href='/nevent1qqs82ezsq7v42v9tm9v5pstsegxa9m5yxrvf2cxarl02dulppf8rmpslh403m'>nevent1q…403m</a><br/>_________________________<br/><br/>we&#39;re getting very close to the problem here. transistor 389&#39;s base-emitter junction is reverse biased, so it is turned off. i pulled the transistor and tested it, so i know it works.<br/><br/>but despite it being off, we know there is current flowing in resistor 757 due to the voltage drop. so where is the current coming from? it can&#39;t be from the transistor since it is off.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/285/455/895/292/779/original/c6b2a79ab3118358.png"> <br/> 2025-09-29T03:29:23Z https://yabu.me/nevent1qqs82ezsq7v42v9tm9v5pstsegxa9m5yxrvf2cxarl02dulppf8rmpszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmje6kqt5 In reply to <a href='/nevent1qqsz977wera46h70rct600e3mvw5z5vfz6fertz7wq3jawpy59f5u5qkkc0yg'>nevent1q…c0yg</a><br/>_________________________<br/><br/>time for the full schematic. i&#39;ve filled in some measured voltages below. basically there&#39;s a resistor divider that creates -12V (or +12, for the upper side). then a voltage follower (transistor 389, 388). those transistors drive the common base cascode stages.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/285/441/796/696/076/original/c7967c1b16f6c820.png"> <br/> 2025-09-29T03:25:53Z https://yabu.me/nevent1qqsz977wera46h70rct600e3mvw5z5vfz6fertz7wq3jawpy59f5u5qzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjfa3khq In reply to <a href='/nevent1qqswpqk87vdzt646yrmhfexz0rh7j20ad3rykkcsuxg6p5aaeesztls9yzcrw'>nevent1q…zcrw</a><br/>_________________________<br/><br/>so in the idle state with no waveform being generated, the low side current sink was sitting at -5.1V instead of -13.6V. this is a problem! but how is it happening?<br/> <img src="https://files.mastodon.social/media_attachments/files/115/285/419/057/643/704/original/75e22e2ab4c6277f.png"> <br/> 2025-09-29T03:19:23Z https://yabu.me/nevent1qqswpqk87vdzt646yrmhfexz0rh7j20ad3rykkcsuxg6p5aaeesztlszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjq2uvdp In reply to <a href='/nevent1qqsq0shsyxn53gn8wcxrttwuyesfn6v5zwedsqeagx2ljjsprajyz5q68c2qg'>nevent1q…c2qg</a><br/>_________________________<br/><br/>...For high dc stability, the difference of the emitter dc currents (378, 379, 380 vs 381, 382, 383), which is about zero, is kept constant by an automatic control loop including OP 303 and transistor 377. this loop is forcing i1 - i2 vi in the frequency range from dc to some hundred Hz. Trimmer 700 is adjusted for flat amplitude response in the take-over range of the direct drive via C536 and C537.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/285/404/166/410/619/original/c5fa881109648239.png"> <br/> 2025-09-29T03:16:17Z https://yabu.me/nevent1qqsq0shsyxn53gn8wcxrttwuyesfn6v5zwedsqeagx2ljjsprajyz5qzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjkylm30 this is the amplifier simplified diagram, from the service manual<br/><br/>...the POWER AMPLIFIER is a complementary collector-output type. At frequencies aboe some hundred Hz the ac input voltage is passed through the input buffer and C536, C537 directly to the base of transistors 378 and 381, converted to ac currents by 378...383 and fed through 385, 386, 387 and 390, 391, 392 respectively to the internal 50 ohm output resistor, made up by the resistors 781...786.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/285/395/528/681/936/original/0b560a50a9519ee8.png"> <br/> 2025-09-29T03:14:16Z https://yabu.me/nevent1qqsqm9jvnfp0lp6vpqt7f2cdnk592wgfwwhftxvrglkzyeyrekq5frczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjs58sf7 today i fixed this old function generator! you&#39;ll never believe what was wrong with it.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/285/383/100/218/298/original/6f26fad57b6709f9.png"> <br/> 2025-09-29T03:09:53Z https://yabu.me/nevent1qqsx8w9qqd866v2arwptjnceyz8hvrjnq9mt9pcn3jfp8tznzqum0sgzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj0haa0s i fixed a computer this week. this is the 1960s IBM 1401 at the Computer History Museum in California.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/233/766/946/797/324/original/09bfd22c310a6abe.png"> <br/> 2025-09-20T00:22:44Z https://yabu.me/nevent1qqstqursh7jda9g7g37wp7gcz9d3lsyet3xwlcgz4kqp53qeejm79gqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjmlvn43 In reply to <a href='/nevent1qqsxgsd9wnajeurys6jvtxpvwylqgemtzs36fsuynrrl32yyez79ljctyp0x8'>nevent1q…p0x8</a><br/>_________________________<br/><br/>some newfangled computer with a colorful case<br/> <img src="https://files.mastodon.social/media_attachments/files/115/202/868/051/523/154/original/32439e14a4217052.jpg"> <br/> 2025-09-14T13:24:39Z https://yabu.me/nevent1qqsxgsd9wnajeurys6jvtxpvwylqgemtzs36fsuynrrl32yyez79ljczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjjh4jt7 In reply to <a href='/nevent1qqstf2dnsue4z282sa60cj72njflf4dh3kxlfq7qtj5xn64h2ffnuaqxx2tex'>nevent1q…2tex</a><br/>_________________________<br/><br/>ooh a DEC AlphaStation.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/202/861/702/940/075/original/5c186f61f4e9567f.jpg"> <br/> 2025-09-14T13:23:00Z https://yabu.me/nevent1qqstf2dnsue4z282sa60cj72njflf4dh3kxlfq7qtj5xn64h2ffnuaqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjfml5x2 In reply to <a href='/nevent1qqstpl0et2r804gwc86lghzupscryjnwp3lhkt6dj28wt9788qzwz2gxfg3wr'>nevent1q…g3wr</a><br/>_________________________<br/><br/>this thing plugs into a PC expansion slot and provides IO, timers, ADCs, presumably as some sort of electronics learning thing.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/202/852/033/947/144/original/3fb9f28ca9e30d62.jpg"> <br/> 2025-09-14T13:20:54Z https://yabu.me/nevent1qqstpl0et2r804gwc86lghzupscryjnwp3lhkt6dj28wt9788qzwz2gzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjd667rv In reply to <a href='/nevent1qqs2mrv6yc0aw63hwjn6774js6w2d4fvza7qmph2mf9yerad3rva00cnze6ta'>nevent1q…e6ta</a><br/>_________________________<br/><br/>mystery device.<br/> <img src="https://files.mastodon.social/media_attachments/files/115/202/843/601/153/151/original/a59e84b4a2129732.jpg"> <br/> 2025-09-14T13:18:21Z https://yabu.me/nevent1qqs2mrv6yc0aw63hwjn6774js6w2d4fvza7qmph2mf9yerad3rva00czyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjsng5u5 In reply to <a href='/nevent1qqstmuuhq28xwd4n9a3v9dmx5rx8mf65e38ye66ykh6w3na0zkdnmpq680rr0'>nevent1q…0rr0</a><br/>_________________________<br/><br/>this&#39;ll really ring your bell<br/> <img src="https://files.mastodon.social/media_attachments/files/115/202/815/475/817/480/original/b9d4498a09e78465.jpg"> <br/> 2025-09-14T13:11:04Z https://yabu.me/nevent1qqstmuuhq28xwd4n9a3v9dmx5rx8mf65e38ye66ykh6w3na0zkdnmpqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj8wjjf5 In reply to <a href='/nevent1qqsw7cvms4vdugcmcsqu74dc8jjdd7gu8qcx6p3atz6fwpfh9dkpgqqtgqm2s'>nevent1q…qm2s</a><br/>_________________________<br/><br/>oh wow an Armatron<br/> <img src="https://files.mastodon.social/media_attachments/files/115/202/801/473/303/054/original/b7abad669abbeea7.jpg"> <br/> 2025-09-14T13:07:30Z https://yabu.me/nevent1qqsw7cvms4vdugcmcsqu74dc8jjdd7gu8qcx6p3atz6fwpfh9dkpgqqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjv5vqs6 In reply to <a href='/nevent1qqs8gpnyz6a8fsx6y5yxaqetntl9aqar8lqfks0p0u5e47t8e45lmkggv9yr5'>nevent1q…9yr5</a><br/>_________________________<br/><br/>Sencore! (I&#39;ll add alt text to these images later)<br/> <img src="https://files.mastodon.social/media_attachments/files/115/202/796/241/113/615/original/ffa06fbcd45b8123.jpg"> <br/> 2025-09-14T13:06:35Z https://yabu.me/nevent1qqs8gpnyz6a8fsx6y5yxaqetntl9aqar8lqfks0p0u5e47t8e45lmkgzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjqtnft9 it&#39;s the last Silicon Valley Electronics Flea Market here at West Valley College! 🧵<br/> <img src="https://files.mastodon.social/media_attachments/files/115/202/790/083/858/979/original/4a2abadd950f3d0b.jpg"> <br/> 2025-09-14T13:04:59Z https://yabu.me/nevent1qqs8xhuv0ht9zs79algxqf78um98n8qttpjer6nuq2jjegtku70c9ygzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjptm76f i reverse-engineered the Raspberry Pi Compute Module 5! check it out at <a href="https://github.com/schlae/cm5-reveng">https://github.com/schlae/cm5-reveng</a><br/> <img src="https://files.mastodon.social/media_attachments/files/115/085/630/825/109/253/original/3eb7b310ffb80639.png"> <br/> 2025-08-24T20:31:12Z https://yabu.me/nevent1qqsft39mc27m9z34n0lj7cd7upd5d0xsaxpks57kp80ksuce7yufwuczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjjga4xp retrocomputing...in 1976!?<br/> <img src="https://files.mastodon.social/media_attachments/files/115/042/806/150/008/355/original/acf2d417c7979443.png"> <br/> 2025-08-17T06:58:55Z https://yabu.me/nevent1qqsg9a44r6ltx2qxhn4e3zyyzkkg8lnvkdw65pzyftrg0uruu0ajd6czyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjtmkvrj this DIP chip has a tiny window in it so you can see the quartz crystal inside. (it&#39;s a PXO-600 programmable crystal oscillator chip)<br/> <img src="https://files.mastodon.social/media_attachments/files/115/041/750/179/347/356/original/c35f6f0e8ac56110.png"> <br/> 2025-08-17T02:30:18Z https://yabu.me/nevent1qqsd82h4n2w93nv36ctrdgduurjc4hw6m920fet52kxsra476dmr0mczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjr800f5 In reply to <a href='/nevent1qqsx3fdg2sq0ll7kfzmsm8z9l8qtja9yfw8zyx7m06w5srsk80wv53cjgasl3'>nevent1q…asl3</a><br/>_________________________<br/><br/>I&#39;m a fan of Very Light Morse?<br/> <img src="https://files.mastodon.social/media_attachments/files/115/004/687/331/570/454/original/c457a7f9177da7d4.jpg"> <br/> 2025-08-10T13:24:45Z https://yabu.me/nevent1qqsx3fdg2sq0ll7kfzmsm8z9l8qtja9yfw8zyx7m06w5srsk80wv53czyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjlt9zxd In reply to <a href='/nevent1qqs2d4j8jutudnn6lal09qfcp74ae3ruymnultk6anh7zpu6l8ynehssasatm'>nevent1q…satm</a><br/>_________________________<br/><br/>some sort of fancy soldering iron controller?<br/> <img src="https://files.mastodon.social/media_attachments/files/115/004/656/551/844/072/original/c487b01a02ef2fc8.jpg"> <br/> 2025-08-10T13:16:41Z https://yabu.me/nevent1qqs2d4j8jutudnn6lal09qfcp74ae3ruymnultk6anh7zpu6l8ynehszyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjrk8wkv In reply to <a href='/nevent1qqsgzuty49gulc73re289hc4typ587qpdd04y3n4lmv6tajluau2xxc95w9m0'>nevent1q…w9m0</a><br/>_________________________<br/><br/>oh no, a Coleco Adam!<br/> <img src="https://files.mastodon.social/media_attachments/files/115/004/644/854/338/901/original/37aa68d39bec8ba8.jpg"> <br/> 2025-08-10T13:13:45Z https://yabu.me/nevent1qqsgzuty49gulc73re289hc4typ587qpdd04y3n4lmv6tajluau2xxczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj3hpgqf it&#39;s time for the August electronics flea market here in silicon valley (West Valley College)!<br/> <img src="https://files.mastodon.social/media_attachments/files/115/004/639/625/030/235/original/229a0c9035d6b49f.jpg"> <br/> 2025-08-10T13:12:49Z https://yabu.me/nevent1qqsxgs88kzz75dqm7s5xukt8r96490863e4ar308d76lc4s8k3c7npgzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjajjqhl i&#39;m proud to have been involved in the creation of this new book from <br/><span itemprop="mentions" itemscope itemtype="https://schema.org/Person"><a itemprop="url" href="/npub1zuwgrjzzsydwcv2gj7dkzgtv7ef4j8r3zxkxy3mrhjsacy46a2rsel4emf" class="bg-lavender dark:prose:text-neutral-50 dark:text-neutral-50 dark:bg-garnet px-1"><span>No Starch Press</span> (<span class="italic">npub1zuw…4emf</span>)</a></span> , Designing Electronics That Work! it&#39;s full of useful material for anyone who wants to build anything electronic and bring it to mass production.<br/><br/><a href="https://nostarch.com/designingelectronics">https://nostarch.com/designingelectronics</a><br/> <img src="https://files.mastodon.social/media_attachments/files/114/989/984/347/690/727/original/53295fea6c9a6195.png"> <br/> 2025-08-07T23:06:22Z https://yabu.me/nevent1qqszjv35qk3l2ytscrwdxhp2dhlrjg6su0r5vtvrwq08lc7syvflwgqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj80expw In reply to <a href='/nevent1qqswdgszr4kfn9pe90tck6yy8dlt8h20sd8yv9j60a77gx50xu0p25gdcrhg4'>nevent1q…rhg4</a><br/>_________________________<br/><br/>it&#39;s a manual key punch! you can punch your own 80 column cards with it.<br/> <img src="https://files.mastodon.social/media_attachments/files/114/945/672/081/491/579/original/2eb8fa3ddfd1f909.png"> <br/> 2025-07-31T03:17:15Z https://yabu.me/nevent1qqswdgszr4kfn9pe90tck6yy8dlt8h20sd8yv9j60a77gx50xu0p25gzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjdw6zxx what&#39;s in the mystery box?<br/> <img src="https://files.mastodon.social/media_attachments/files/114/945/667/491/857/688/original/daa44803882b72aa.png"> <br/> 2025-07-31T03:15:48Z https://yabu.me/nevent1qqsyl9zh89z0k3f3navywp3ry5zejzl8zhe4nn8vswpn275argdfnygzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjcsrnrf In reply to <a href='/nevent1qqs0kupf6gtuj8fkc74vdnffmjtrzygq200valpnwk54qssskuvv8wc3da0nt'>nevent1q…a0nt</a><br/>_________________________<br/><br/>Happy birthday, Amiga! <br/>~ In memory of Dave Needle, wild man, Amiga hardware designer ~<br/> <img src="https://files.mastodon.social/media_attachments/files/114/903/246/815/408/232/original/c0c4b16237b37044.png"> <br/> <img src="https://files.mastodon.social/media_attachments/files/114/903/247/669/530/599/original/4417ea6d4afc5275.png"> <br/> 2025-07-23T15:27:09Z https://yabu.me/nevent1qqs0kupf6gtuj8fkc74vdnffmjtrzygq200valpnwk54qssskuvv8wczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmj33tvu0 In reply to <a href='/nevent1qqspjwvavkafqt0y4xnmlzxj7ek7h7tk78ugkaf83zpjutqq9kjzq2saew0z2'>nevent1q…w0z2</a><br/>_________________________<br/><br/>Anyway, the Amiga had better games.<br/> <img src="https://files.mastodon.social/media_attachments/files/114/903/244/251/576/170/original/730ff8685d2d08f6.png"> <br/> <img src="https://files.mastodon.social/media_attachments/files/114/903/245/075/438/344/original/1c63c592e4a31440.png"> <br/> 2025-07-23T15:26:26Z https://yabu.me/nevent1qqspjwvavkafqt0y4xnmlzxj7ek7h7tk78ugkaf83zpjutqq9kjzq2szyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjlvrsur In reply to <a href='/nevent1qqsdl4wz5pcq5suhv9clunjpg6vtqgxk989hg2c9lffzyvhdvfs90qgqsycma'>nevent1q…ycma</a><br/>_________________________<br/><br/>This may also have contributed to the success of the Macintosh–although it had no custom chips, it had high resolution monochrome graphics and was easy to set up and use, and also had business-related software such as the brand new Microsoft Excel.<br/> <img src="https://files.mastodon.social/media_attachments/files/114/903/242/765/098/542/original/251e4ab21416c025.png"> <br/> 2025-07-23T15:25:50Z https://yabu.me/nevent1qqsdl4wz5pcq5suhv9clunjpg6vtqgxk989hg2c9lffzyvhdvfs90qgzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjp9dsac In reply to <a href='/nevent1qqs22km3ndedl55tsyuke2qhmnjhxaufd3q32ake3pydzdajjdzczuqrsrlux'>nevent1q…rlux</a><br/>_________________________<br/><br/>Although the Amiga had great graphics, the high res modes caused eyestrain–the interlace flickered noticeably, and they did this to retain compatibility with TV video, even though dedicated monitors were most popular. Business users preferred IBM clones with flicker-free high res B&amp;W graphics. 2025-07-23T15:25:32Z https://yabu.me/nevent1qqs22km3ndedl55tsyuke2qhmnjhxaufd3q32ake3pydzdajjdzczuqzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjv3hjgt In reply to <a href='/nevent1qqsx5nk65sgzj0qpxtmr4pgx33nrnhm3nm2j8ur9nvkl587ymny9vzgn2j0am'>nevent1q…j0am</a><br/>_________________________<br/><br/>You could save money on a PC clone, such as the Leading Edge PC ($1495) but this only had monochrome graphics and ran at 1/2 the clock with a slow 8088 CPU. For EGA graphics, it would cost you an additional $524 (plus a new monitor) and the custom chips on this card were bad compared to the Amiga.<br/> <img src="https://files.mastodon.social/media_attachments/files/114/903/236/673/696/270/original/204ea14fbd0a9776.png"> <br/> <img src="https://files.mastodon.social/media_attachments/files/114/903/237/733/826/491/original/194edc2f26eea175.png"> <br/> 2025-07-23T15:24:36Z https://yabu.me/nevent1qqsx5nk65sgzj0qpxtmr4pgx33nrnhm3nm2j8ur9nvkl587ymny9vzgzyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmjlj5gu2 In reply to <a href='/nevent1qqsdggkgygccl7pvjcv78gu0fzyvnhmtsz6yqhvahwkcc6gxzqlyyncnk0zc0'>nevent1q…0zc0</a><br/>_________________________<br/><br/>Computers were expensive in those days. The base price ($1295) plus the monitor ($495) plus 256K of additional RAM ($195) brought the total up to $1985 – after adjusting for inflation, this would be about $6000!<br/> <img src="https://files.mastodon.social/media_attachments/files/114/903/234/826/165/357/original/c30da58571b5eacc.png"> <br/> 2025-07-23T15:24:01Z https://yabu.me/nevent1qqsdggkgygccl7pvjcv78gu0fzyvnhmtsz6yqhvahwkcc6gxzqlyynczyqe3zgt6p9z8ly5wn9dqeaf33eddczmtwlwy8wsnahn4fep97utmje3sfrj It’s the 40th birthday of the first computer I remember using. The Amiga 1000 was released this day in 1985!<br/> <img src="https://files.mastodon.social/media_attachments/files/114/903/233/105/769/500/original/a024fbf96ab20ea9.png"> <br/> 2025-07-23T15:23:31Z