CPS Option Board

Since I have one laying on my desk... Barely the length of a short ISA slot, with fingers on the end like a floppy drive edge connector, as well as a set of header pins for a floppy drive cable that goes to the "real" drive. The card is in series with the floppy drive cable. It has one main chip, about 8051 sized, maybe 60 pins: Transcopy 3 c CPS TC19GO32AP-0036 Japan 8819EA! the ! could be just a vertical line. There is a 48 mhz crystal, and a 1987 copyright. Two sets of jumpers seem to select between PC/XT and AT/Compaq, another set looks like DMA1 or DMA2. Remaining chips are a LS245 to the ISA bus, a 7406 by the PC/XT jumpers, and a 8812S UM8326B next to the crystal. ********* My guess is that knowing what the big chip is and does is the only "catch", the rest could be traced out in a few minutes.