Like I said, the alternatives can certainly work. Until they don't. And some alternatives work better than others. I checked some notes and found the Eric Smit

Like I said, the alternatives can certainly work. Until they don't. And some alternatives work better than others. I checked some notes and found the Eric Smith[1] page where I learned about this. Eric has been around the retrocomputing and DEC world for a long time. I also have a note that the Russian КР559ИП3 is the equivalent to/copy of the original driver chips. I've never seen one. [1] http://www.brouhaha.com/~eric/retrocomputing/dec/interfacing/chips.html http://www.brouhaha.com/~eric/retrocomputing/dec/interfacing...