Well, I probably paid that sort of figure for the TechRefs 10 years ago. OK, they were brand new, from IBM. And I regard that as money very well spent. Think how long it would tkae to re-create all that information -- to trace out all the schematics and comment the BIOS source. [...] Mine too. I make a point of buying any second-hand computer book that contains non-obvious infromation (I probably won't publish an 'introduction to BASIC' type book if it's generic, but I would buy one for a specific machine if it contained bus pinouts or a schematic, or a detailed memory mape that I didn't already have). I have books on machines I don't own, and probably will never own. The information in them, though, comes in very useful quite often (as I mentioned in another message, a 3rd party book on repairing the Commodore 1541 -- a drive I have little interest in -- had some useful information regarding a chip used in an Epson drive that I am interested in repairing. Thank %deity I bought that book when I saw it). And I mean, there must be somebody who needs a schematic for an interface between Unibus amd an IBM 360 channel, right? (No, I am not offering to get rid of my DX11 printset..) -tony