HP 67 Power Supply (not oscillating)

[teenix]

I'm a little unsure if this is where you would like to go, but delving deeper hardware wise, I suppose in that sense all of the components of the calculator, except for the CRC IC, as they work as a team.

Hardware dependencies down the line would be something like...

The output to the display is generated by the anode driver and the cathode driver.

The cathode driver for digits is dependent on the ACT for RCD, and ROM0 for STB
The anode driver for LED segments is dependent on the ROM0 IC
ROM0 is dependent on information on the Is bus, bits 0 - 7, generated by the ACT
This info is dependent on the ACT A and B register settings and the display ON/OFF control
These settings are dependent on the code from the ROMs

As mentioned, the code in the ROM ICs listed in the emulator output will get the power up display [0.00] and these should be the only ROMs required to get to this point.

cheers

Tony