On Oct 1, 2014, at 11:06 AM, Mark J. Blair <nf6x at nf6x.net> wrote: Nice work! Very handy. One suggestion: you might want to split out the "common function" common to one that doesn't include modified Unibus; assuming you're only developing peripheral cards (not a guarantee), you can get away with significantly less HV and -V capable pins if you ignore that (at the user's peril, I guess). - Dave

On Oct 1, 2014, at 2:06 PM, Mark J. Blair <nf6x at nf6x.net> wrote: Well, in the 11/44 at least it's used as the bus that the CPU and memory sit on; only the AB slots at either end of the backplane are standard Unibus. It's similar in the 11/34. In the 11/44, the console interface module (an 8085 micro which performs the functions formerly delegated to the front panel) and the bus jumpers and terminators are the only things that occupy standard Unibus slots; the modified Unibus is mainly meant for memory (thus the core voltages). Typical Unibus peripherals are quad-width; those that are hex-width are *generally* only in it for the additional power, not unlike quad-width Qbus cards that don't use the CD bus. There are certainly exceptions, but I don't know what they are. If someone is trying to build Unibus memory, they'll probably be interested in the modified Unibus pins. Otherwise, it's somewhat unlikely. - Dave