Reading HP67 ROMs

[teenix]

Hi Eduardo,

I updated the Classic Notes with everything I know to date.

I have breadboarded a circuit and will attempt to connect it to the Is bus and see what happens.

If I get time I was going to make the project work in one of two modes.

1) Connect direct to the HP circuit board after isolating the Is bus to read the ROMs.

2) Separate power supply, clocking etc. and sockets for the ROMs including the 18 pin ROM0 chip to test them individually and be able to read/write RAM as well. This method should also work with Spice ROMs.

This might take awhile, as I am still in temporary accommodation while battling crazy property prices and dwindling stocks where I would like to be.

cheers

Tony