HP97 The journey begins

[dmh]

I can drop a couple of cards round if you like Tony.

(11-13-2021 01:00 AM)teenix Wrote:  Hi all,

I had a bit of trouble with the card reader, but it appeared to be because of the transferring of code from the other processor to this one. The sense chip operates from different IO pins on this processor and I found a bug there. Also the code works in a different way in the new processor because it has to work independent of the printer and vice versa. As such, a few variables that were used in the card process did not work anymore but once they were altered the card read/write seemed to come to life.

It is a bit difficult to test this part of the board. It looks like the motor coupler slips intermittently so it will need replacing and I'm not sure if the single magnetic card I have works properly or not. If they play up unnoticed, it can lead to a long chase into complex code for faults that may not exist.

Still some testing to go and once that is complete, I will add code for the IR printer and 97S interfaces.

I think HP probably designed the whole 97 in less time than it has taken me to do the main board, but it has been a trip.

cheers

Tony