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Reading HP67 ROMs
06-10-2022, 12:52 PM
Post: #16
RE: Reading HP67 ROMs
(06-10-2022 08:50 AM)Marcovecchio Wrote:  This is great, Tony! There is a lot of effort and knowledge in there, many thanks for putting this together.

And also, thanks for ROM0 support, this is a very welcome addition! With this piece of hardware, it will be much easier to pinpoint defective chips on classic or spice calculators. And I think it may work with Woodstock ones with almost no modifications, right?

This ROM dumper might even evolve in the future into a ROM checker / identifier, all that is needed is a small table of CRC pre calculated vales for the known ROMs. Then the ROM would be read, have it's CRC calculated and compared to the table. If found, the ROM is both OK and identified with no margin for error! This feature might be completely implemented as software at PC side.

As I already have the data for most ROMs, it can verify against the library data and also list the opcodes on screen as it reads them.

I am hoping to check all the RAM registers via the DATA line as well.

As well as the sockets, there is also a connector for flying leads which can connect direct to the chip pins with suitable connectors - even on a prototype board.

I just played around with a 67 CRC chip and fooled it into reading a card. The CRC did all the normal motor control etc when a dummy card was inserted, but the data actually came from a PIC processor and afterwards the program ran nicely too - interesting

cheers

Tony
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Messages In This Thread
Reading HP67 ROMs - Marcovecchio - 05-05-2022, 01:50 AM
RE: Reading HP67 ROMs - teenix - 05-05-2022, 03:59 AM
RE: Reading HP67 ROMs - teenix - 05-12-2022, 05:06 AM
RE: Reading HP67 ROMs - Marcovecchio - 05-05-2022, 10:53 PM
RE: Reading HP67 ROMs - teenix - 05-05-2022, 11:36 PM
RE: Reading HP67 ROMs - Marcovecchio - 05-06-2022, 01:51 AM
RE: Reading HP67 ROMs - teenix - 05-06-2022, 05:11 AM
RE: Reading HP67 ROMs - teenix - 05-07-2022, 12:41 AM
RE: Reading HP67 ROMs - Marcovecchio - 05-08-2022, 01:30 AM
RE: Reading HP67 ROMs - teenix - 05-08-2022, 02:34 AM
RE: Reading HP67 ROMs - Dreato - 05-12-2022, 04:28 PM
RE: Reading HP67 ROMs - Marcovecchio - 05-13-2022, 03:56 AM
RE: Reading HP67 ROMs - teenix - 05-13-2022, 04:58 AM
RE: Reading HP67 ROMs - teenix - 06-05-2022, 10:37 AM
RE: Reading HP67 ROMs - Marcovecchio - 06-10-2022, 08:50 AM
RE: Reading HP67 ROMs - teenix - 06-10-2022 12:52 PM
RE: Reading HP67 ROMs - teenix - 06-12-2022, 08:13 AM
RE: Reading HP67 ROMs - Marcovecchio - 06-25-2022, 10:57 PM
RE: Reading HP67 ROMs - teenix - 06-26-2022, 06:38 AM
RE: Reading HP67 ROMs - teenix - 06-28-2022, 02:34 AM
RE: Reading HP67 ROMs - teenix - 06-29-2022, 02:06 AM
RE: Reading HP67 ROMs - teenix - 07-12-2022, 03:28 AM
RE: Reading HP67 ROMs - Marcovecchio - 07-14-2022, 11:11 AM
RE: Reading HP67 ROMs - teenix - 07-21-2022, 01:34 AM
RE: Reading HP67 ROMs - tangdfx - 07-21-2022, 02:36 AM
RE: Reading HP67 ROMs - teenix - 07-21-2022, 02:58 AM
RE: Reading HP67 ROMs - tangdfx - 07-21-2022, 03:19 AM
RE: Reading HP67 ROMs - teenix - 07-21-2022, 03:48 AM
RE: Reading HP67 ROMs - tangdfx - 07-21-2022, 04:02 AM
RE: Reading HP67 ROMs - teenix - 07-29-2022, 08:38 AM
RE: Reading HP67 ROMs - Paul Dale - 07-30-2022, 09:05 AM
RE: Reading HP67 ROMs - Thomas Klemm - 07-30-2022, 10:23 AM
RE: Reading HP67 ROMs - teenix - 08-08-2022, 03:39 AM
RE: Reading HP67 ROMs - teenix - 08-27-2022, 08:04 AM
RE: Reading HP67 ROMs - teenix - 08-28-2022, 05:26 AM



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