21 Sep
2015
21 Sep
'15
7:09 a.m.
Spot on. it HAS the 2114 ram chips. now to find
replacements..
The slight delay after power-on before giving the error indication suggested
a memory test to me...
Of course it might not be 2114 problems, but I have replaced so many of those
ICs over the years in all sorts of devices that I suspect them on sight now :-)
strange enough there are 12 positions for ram chips
and two of them are
left unpopulated: pos 1 and pos 7.
2114s are normally used in pairs,, of course. They are 1K*4 RAMs, so it takes 2
to make a byte. I hope some kind person hasn't 'borrowed' a couple of RAMs
from the plotter, that would be nasty.
-tony