23 Mar
2009
23 Mar
'09
6:32 p.m.
Hi
My pdp-8/e has developed a nasty fault.
I have all the manuals and a scope but before delving in too deep I thought
I'd see what the 'Hive mind' knew.
Its straight forward enough of a fault. I can no longer toggle in values via
the switch register.
The address sets up ok and the switch register value appears to transfer to
core on raising DEP.
The location counter increments normally.
However going back and checking the locations shows nothing there.
It does not appear to be a problem with the core as replacing the low
address 4k with a higher one makes no difference.
Experienced PDP-8 fixers please comment.
Rod Smallwood