19 Jul
2005
19 Jul
'05
2:07 a.m.
I''ve converted the S-box version, not the PB version. However, there were
some scanned docs of the KDJ11-d series boards on shoppas trailing edge
site. I looked at my copy and it does show you which/where the jumper and
resistor combination that needs to be changed to convert from 16K to 32K
proms. I included your particular board.
Doug
At 05:16 PM 7/14/2005, you wrote:
Hi,
Does anyone have direct experience replacing the eproms in a M7554-PB?
The top layer says "CPU KDJ11-D". It's s-box and is labeled M7554-PB.
The eproms are 27C256's. I want to replace them with 23-261E5 and
23-262E5 images (16k, or 27C128) to turn the board into (hopefully) a
PDP-11/53.
I managed to erase two 27C128's and burn them this morning but I discovered
that the instructions I found on the web
http://users.safeaccess.com/engdahl/KDJ11.htm
don't match my board (very nice instructions, none the less - thanks!)
I may just try it and see what happens, or reprogram the 27C256's with
the image doubled, just for fun.
-brad