2 ms·

Can you explain what’s odd about the ROM chips of the PET necessitating the adapters for replacement with more common parts?

• kens 2y ago
  The MOS Technology 6540 ROM included some on-chip address decoding. The adapter board has a TTL chip to perform this decoding, and uses a standard 2716 EPROM.
  • MBCook 2y ago
    Oh interesting. I’ve never heard of a chip like that. Thanks.