Need PC-AT "keyboard BIOS" docs

I had this idea for a keyboard adapter for classic machines, but I don't understand the 40-pin "keyboard BIOS" microcontroller well enough to know if it's possible... The idea is this - a PS/2-keyboard to RS-232 converter - plug in any AT- style keyboard, hook the other end into the receive pin of the target's console port. I started from a) a microprocessor-based OMNIBUS peripheral and wanted to put an LCD or VFD on it for status and control. Then I decided I wanted to be able to _talk_ to the embedded processor, not just listen, but without the bulk and hassle of a dedicated VT100 or laptop. If I could cobble up a simple way to turn PS/2-style keyboard strokes into 9600 baud ASCII characters, I could leave that circuit in place and plug in a keyboard as needed. I know that the 6402 serial chip can be strapped to operate in a dumb converter mode - I've seen it used in GPIB<->serial boxes for the PET with no microcontroller in the box. Depending on the microprocessor-facing end of an AT "keyboard BIOS" chip, I was thinking that you could pull one from an old motherboard (that still had them independent from the core chipset), run the scan codes through a translator EPROM, use the "release" scan codes as a trigger to a latch that would hold the character in place for the 6402 to send. Three major chips and about an afternoon of point-to-point wiring, maybe a TTL part or two, to drive the keyboard and maybe trigger the UART. Does this sound like a reasonable approach? I'm not opposed to using a PIC or Atmel microcontroller, but a no-CPU approach with stuff from my junk box is especially appealing. I have a lifetime supply of low density EPROMs, a stack of 6402s and old motherboards with removable keyboard chips. Just not sure it's possible since I don't understand the keyboard chip at the moment. So... is there a good place (on the web) to learn about the "keyboard BIOS" chip? Alternatively, is there already a project like this that I can clone? If anyone has any examples of how to attach a PeeCee keyboard to a 68000 or 6502 directly, without going through a UART, I guess I'd be interested in that, too; but since I was already planning on sticking a Z8530 or 6551 or 16550 chip on the OMNIBUS board anyway, I might as well use the same serial port for all embedded console I/O. Thanks for any pointers, -ethan __________________________________________________ Do You Yahoo!? Yahoo! Finance - Get real-time stock quotes http://finance.yahoo.com