Reading HP67 ROMs

[teenix]

Hi all,

I used my ROM reader project to read all the ROMs from a HP-97 including the ROM0 display driver, and then also verify the RAM. I found one chip which the RAM seemed consistently faulty.

I've put these in a data base of sorts which the PC program can use for IC access. These are the IC's it has so far, with model and HEX ROM start addresses.

1818-0267 97 0
1818-0228 97 400
1818-0226 97 800
1818-0233 97 C00
1818-0229 97 10400
1818-0230 97 10800

I'll add more as I can. Any user can add more ROMs by entering the reading requirements like start address etc.

During a ROM read if a comparison file is available, the incoming data will be checked while the read is in progress. If the comparison file is not available, then one can be easily generated after the initial read takes place.

The circuit board needs a few mods, so I will tackle that as time permits and then make the project available.


Just a quick note, I've also been playing around with ROM IC replacements and after fiddling with some code and circuit designs, I think I have a setup that will work and It should fit into the same space as the original 8 pin ROMs. The ROM 0 will need extra work because it also controls the display anodes which I haven't quite figured out yet, so it still needs some work, plus I need to create a test jig to simulate the Sync, Is and Data busses and verify its operation before trying it out for real.

cheers

Tony