HP97 The journey begins

[teenix]

Hi all,

I've slowly been making progress on the HP-97 CPU board replacement.

Here is an image of the board design so far. I still have to tidy it up and verify it but it is starting to take shape.



I've put together the print character ROM for the PIK chip emulation and how it will work under the control of the new processor. Once the HP microcode sends the data to the processor, I wasn't sure how it would handle the print data but after some access to the character ROM it should only take a few 100 nano seconds of processing to output it to the print heads. This means the processor should easily cope with executing the microcode, keyboard and other odds and ends.

cheers

Tony