HP-71 Diagnostics

[KimH]

J-F

It is the same - i did walk through all the lines, xxx46 is the Checksum.

But, don't let that hold you back, maybe there is some insight which can be applied elsewhere

/Kim

(06-08-2020 04:19 PM)J-F Garnier Wrote:  

(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