HP-71 Diagnostics
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06-08-2020, 04:19 PM
Post: #12
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RE: HP-71 Diagnostics
(06-08-2020 03:32 PM)Dave Frederickson Wrote: There are two versions of the Service ROM image. The original is 64k, like the O/S ROM, so that it'll run in Emu71/DOS. The ROM itself is only 16k and both versions will run in Emu71/Win. There is another version of the Service ROM without the HP-IL or Card Reader tests - a prototype. THAT's interesting ! If it exists an alternate version, you can try to check the checksum byte at the very end of the 16K ROM (address 7FFE), using the built-in debugger. Here is what is inside the known diag rom image: 07f20 714F714000003040404F3F780412214F 07f40 704040404F720C020F7F7408001F7E31 07f60 41414E3F790909060E3141512E5F7909 07f80 1926462949494231010F71010F304040 07fa0 4F37081068170F7028102F7364180413 07fc0 63040874030161594543400000000000 07fe0 00000000000000000000000000000046 If it's a different version, I'm ready to document the method I used to extract it. BTW, the 64k file is just the 16k diag rom padded with 0 for loading into Emu71/DOS. It will not run in Emu71/DOS but still it was interesting for me to study it (didn't go very far actually). J-F |
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