Reading HP67 ROMs

[teenix]

Hi all,

After some code fiddling, I can now read and write to the RAM stored in the ROM chips. This now enables testing of the ROM as well as RAM and the abbreviated RAM test output is as follows...

Cmd: Check Data... >OK

RAM Memory Bank: 0

Pass 1 - Write $A5

Writing: 0
Writing: 1
etc
Writing: 14
Writing: 15

Reading: 0 OK
Reading: 1 OK
etc
Reading: 14 OK
Reading: 15 OK

Pass 2 - Write $5A

Writing: 0
Writing: 1
etc
Writing: 14
Writing: 15

Reading: 0 OK
Reading: 1 OK
etc
Reading: 14 OK
Reading: 15 OK

Completed - RAM Test Passed

I wanted the ROM Reader also to be able to hook directly onto the calculator CPU board and test all ROMs at once, but this could lead to bus conflicts so I will stick to individual ROM chips only.

cheers

Tony