Firmware library was Kaypro 4 CP/M disks

I built one years ago, initially for the CoCo, I later used in on an MS-DOS machine. It consists of 16 output lines (notionally address, but could be used for enables/clocks where nexcessoar), 8 input lines (used to read in the data), and +/-5V, +/-12V power lines. The CoCO version used TTL latches and buffers, the PC version used an 8255 PCB from Maplin. A manual toggle swithc tri-states all ouytput lines and turns off the PSU rails so you can safely insert/remove ICs. These signals all go to one row of pins of a 64 pin DIN 41612 socket. The other row of pins is wired ot the 32 pins of a ZIF socket. I then have little boards with a DIN41612 plug wired appropriately to conenct the inputs, outputs, and power lines ot the right pins of the socket. I suspect that for me, soldeirng up wone of those boards takes less time than modifying a configuration file, so it's actually easier for me to do it in hardware than to have thing that's configured in software. -tony