HP 67 Power Supply (not oscillating)

[teenix]

Nice

This is a list from my 67 emulator and shows what ROM pages (256 words) execute at start up to the key wait loop.

ROM 0 $0000 - $00FF 1818-0268
ROM 2 $0200 - $02FF 1818-0268
ROM 4 $0400 - $04FF 1818-0228
ROM F $0F00 - $0FFF 1818-0231 or 1818-0232 (not sure)

I don't have a list of RAM that might be accessed during start up, maybe I'll add that to the emulator when I get time.

This is a list of 67 chip data that I got from my ROM/RAM reader. The last 2 I'm not sure of because the chips were faulty. I didn't want to remove these from a working board in case of damage like what happened with the ROM0 chip from a HP-92 - it fractured.

Code:


                 ROM Start   RAM start
1818-0268        0           NA
1818-0228        400         0
1818-0226        800         10
1818-0232        C00  ?      20 ?
1818-0231        1400 ?      30 ?

cheers

Tony