Isn't just about everybody who has a 9915 looking for one? I have the pinout of the keyboard connector on the 9915. The keyboard matrix is the same as for the HP85 (and the service manual for that is on the MoHPC CD-ROM). It is just a matrix of switches (OK, shift, ctrl, caps lock are outside the main matrix, if you see what I mean), and a speaker. No active components. I am thinking of 3 solutions : 1) Find a broken 85, raid the keyboard, wire it to a DB25. Problem is that HP stuff rarely dies... 2) Wire up a matrix of switches. 3) Make an interface (microcontroller + a few ICs) to like a PC/AT keyboard to the 9915. Probably the best solution, but the most work. -tony

To stick with the 9915 keyboard for the moment. The Matrix is something like 11 * 8 (or is it 10*8?). And from what I rmember, only 1 key in the matrix is ever 'down' at a time. I was going to simulato that by a couple of analogue muxes back-to-back (if you see what I mean), then I cna feed in the right select codes and effectively press a key. Shift and Control are handled spearately (they have their own pins on the DB25 connector), an open-collector output for each would do. For machines that need have several keys pressed at once, there was (is?) a 4*4 crosspoint switch IC in the 4000 series CMOS. There's proably something like it still available. I was going to use a normal PC/AT keyboard, which has an intenral microcontroller to do the scanning. Feed the serial output of that into my onw microcontroller that then controls the muxes, etc. -tony