I acquired a non-functional PDP-8/A several months ago and in that time I've replaced
all the outwardly damaged parts and have gotten the machine to power on with no issues.
However the problem I've been having now that I can't quite seem to pin down is
that every time I power the machine the address field is displayed as 07777 and the value
field is displayed as 7777. Attempting to change addresses or the value of the address
doesn't work as I can enter the value just fine but upon entering the Load Address
button it defaults back to being all sevens. I've made sure the pins on the CPU board
are set so it should start at address 0, the advanced options are also all turned off and
as far as I can tell there's nothing out of the ordinary with the pin settings on the
IO board.
I'm fairly certain at this point that the issue is with the Programmer's Panel but
I'm not 100% sure.
I've done some further testing using advice I got from users over at the Vintage
Computer Forum and SR and LSR work as intended, I can enter a value into SR and then view
it at a later time. Something interesting I did find was while checking over the CPU I was
looking at the switches on it and while S1-1 was set as expected S1-7 was also on which is
the CPU autostart disabled feature.
Upon powering the computer back on after turning S1-7 off both the ADDRS and DISP displays
show a single 0. I thought I was on the right track though now the panel doesn't work
as if the panel lock was toggle even though it's not, not even the read functions and
SR are working. Switching S1-7 back on reverts the problem back to what it was before and
far as I know all the voltages on the power supply are correct. Any help would be
appreciated, even if it's just a push in the right direction.