8 Feb
2016
8 Feb
'16
7:24 a.m.
Mine was a DEC MSV11 w/128Kbytes installed, solder filling the holes
for the other half of the memory positions. I did not have problems
with traces lifting from that board (I was using an adjustable Weller
soldering station and had fine control over the temperature).
Installing the DIPs went fine but the first test was not successful -
the new memory did not appear. Quick inspection and a few bad solder
joints found and reflowed, and two more cycles of that and I had my
256Mbytess.
Speaking of such modifications. Many, many years ago I modified a M8044 /
MSV11-D board. Removing all the 16 k chips. Replacing those with desoldered
64k chips. Burning a new address decoding PROM. One wire had to go on top
of the chips since the extra address pin used to be a supply pin of the 16k
chips. It worked after a few iterations. And it actually still works.
http://i.imgur.com/miyVaHC.png
