I found https://deramp.com/downloads/mfe_archive/011-Digital%20Equipment%20Corporat… which has the source code... But I couldn't find the tools to use these files to create microcode images.

http://filedump.theglitchworks.net/software/vintage/dec/roms/bdv11_upgrade/ has a number of ROM images. Don't know if they are the ones you want. What are the XX-XXXXX-XX numbers on the PROMs you are looking for? Warner On Tue, Feb 8, 2022 at 6:18 PM Rod Smallwood via cctalk < cctalk at classiccmp.org> wrote: > Hi > > Jerry Walker and I have an 11/34 under restoration. > > We have run into a bit of a problem. > > On the M8266 CPU control board a defective 7404 (E111) has killed a > bunch of the PROMs holding the microcode. > > Does anybody have or can get images of the PROMs on this board so > replacement devices an be programmed. > > Rod > > >