HP-65 goes on hold after reading a card

[teenix]

(11-30-2020 10:23 AM)albertofenini Wrote:  Hi Tony, Hi Everyone

don't worry, we will ask Santa to bring us a new reworking station, our is quite dated ..
The hybrid pins reparation works very well, is the hybrid itself that doesn't work ...
To your knowledge, is the process of storing and executing a program involving the ROMS ?
I feel that the storage space for programs is in the hybrid, and the card reader handling as well, so I would say ROMs have little to do with that ...
We have a set from a old unit and we will give it a try replacing the actual ones

It would be nice to know what exactly each ROM ids responsible for, is that complicated ?

By the way, the unit that keeps on all the C segments (Disp0 and RCD low in amplitude...) would benefit from a ROM change ?
HP-65 1605A02841 - weird display and card reader issues

Lucky you :-)

The commands that access the program storage are in each of the 3 ROMs.

I assume ROM 0-3, ROM 4-7, ROM 8-B are in ascending chip numbering

1818-0073 - 1 command
1818-0074 - 11 commands
1818-0075 - 8 commands

All the logic is in the hybrid

Yes a ROM change might fix the display, even though it seems more likely elsewhere.

cheers

Tony