KDJ11 eproms / M7554-PB conversion?

[Douglas Taylor]

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