jhamby on Nostr: Apparently the first batch of the C64 motherboards from the factory in Japan had some ...

Apparently the first batch of the C64 motherboards from the factory in Japan had some misrouted traces because someone looked over the PCB design and didn't realize what the intended use for those lines was and removed them from the layout, and because Commodore didn't want to spend the money to scrap those boards and print a new batch that could use the fast I/O lines, they instead made the ROM engineer rewrite the I/O routines to use the CPU and transfer at even slower than VIC-20 speeds.