2 ms·Author here if anyone has questions.by kens 1y agoAuthor here if anyone has questions.MBCook 1y agoCan you explain what’s odd about the ROM chips of the PET necessitating the adapters for replacement with more common parts?kens 1y agoThe 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 1y agoOh interesting. I’ve never heard of a chip like that. Thanks.