HP82143 Processor details

[blackjetrock]

(06-03-2023 05:57 PM)brouhaha Wrote:  

(06-03-2023 01:31 AM)cruff Wrote:  I recall Steve Leibson told me in reference to the 98037A that the 3870 has no way to read out the contents of the ROM without decapping the chip and extracting it from the mask.

Steve Leibson is very knowledgeable about almost everything electronic, but this is a rare case in which he is mistaken. The MK3870 has a documented test mode that can be used to dump the ROM. It's tricky to do so, but possible.

Hmm, I have a working printer and have found a ROM dump procedure, so I think I'll have a go, maybe.