PS/2 Keyboard adapter for TRS-80?

RIght, thanks, I;ll look into those. Of couese the problem with crospoint switch ICs is that they will act like an array of mechanical switches, and could have 'sneak paths'. If the origianl keyboard has a diode in series iwth each key (or with some of the keys, like SHIFT), then the crosspoint switch IC may not correctly simulate the keyboard's behaviour. A good solution would seem to be a set of latches (one for each column), feeding open-collector buffers (enabled by the column scan lines), the outputs of corresponding buffers of each latcvh being linked togeter and to the row lines. Problem is, there is no 8-bit latch with open-colelctor outputs that I can quickly spot, so it's 2 or 3 ICs (3 ICs, say a '374 and a couple of '03s ) for each column. I suppose you could program an FPGA to do it, but that's horrible... -tony