While you wait for proper info... apologies if you've already considered and rejected this, or if it's a silly idea... Were you after software or hardware info or both? Either way... I don't know the DT2766 itself, but I found a DT2766 picture that looked like 4 simple D2As on a card. Based on that, and on what I remember from a few decades ago, have you looked around for DEC documentation on the AAV11C? There ought to be some in various realtime-related documents which with luck would be available on Bitsavers and elsewhere, but I couldn't quickly find anything useful just now. The AAV11C was a simple PIO dual height Qbus 4channel DAC card (and before it, there was the AAV11A quad height card). If you're lucky you *might* get a pleasant surprise from the AAV11C. Or it might be completely different My hardcopy of DEC's 1985 Microcomputer Products Handbook has five pages on the AAV11C in chapter 33, covering addressing, configuration, but not connector pinout. Chapter 33 references the LSI11 Analog System Users Guide, an AAV11C Field Maintenance Print Set, and the AAV11 Diagnostic Documentation Kit. Manx says the Analog System Users Guide isn't online, didn't check the others.. There was also an AAV11D which really was a rather different beast, with upmarket features like DMA. Best of luck John Wallace