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Reading HP67 ROMs
06-29-2022, 02:06 AM (This post was last modified: 06-29-2022 02:07 AM by teenix.)
Post: #21
RE: Reading HP67 ROMs
Hi all,

I was reading the 1818-0229 ROM chip listed as ROM 5 in the 97 service manual to test some code mods because it is accessed from ROM Bank 1 and is now working ok.

I then thought that this was supposed to be the highest ROM with RAM included on chip and then logically this would be the highest RAM bank, address space $30 - $3F, but it only read back from address space $20 - $2F.

The plot thickens.


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