HP-10 disassembly/reassembly

[teenix]

(02-14-2020 09:16 PM)[kby] Wrote:  Tony,
From your answer (and further assuming what I asked about in the previous reply), there are some pinout issues on the CPU. The line in question (line 4 from the keyboard) actually connects to pin 36 of the CPU, not pin 37. I took (hopefully) good photos of both sides of the board so I can figure out what else is off.

Sadly, reflowing the solder (again) and trying to scrub out under the chip near that pin didn't help (which is not a surprise, but one could hope). My guess is the pin is disconnected inside the DIP package.-kby

Yes, I just noticed that the pin outs are not correct. I must have been having a senior citizen moment :-) I'll repair asap.

Sad news for the possibly faulty CPU.

cheers

Tony