I have the programming docs for the above machines and possibly a 
few others. Details on how to initialize all the hardware and a complete 
address map. 

	Poking at some of the MI front ends, it looks like there's enough 
on the VME end to support some expansion cards initially. There's also an 
MI AIC6300 driver, perhaps it could be cleaned up to support the AIC6250 
so that it can be attached by VME or to the mainbus.

	Also, for Allen's web site, the 8500+ is an 88110 machine where 
the 8500 is 88100. Both have A24(?) VME backplanes for expansion.

	The DUART's on the 400 series have two ports each, only one 
supports "modem control", so one channel on each DUART is for the RS-232 
ports, the secondary channel on one DUART is for the mouse, and the other 
secondary channel is unused.

	I believe the other UART is the keyboard controller (Standard AT 
style IBM keyboard) with a timer circuit. That's off the top of my head as 
the docs are at home. There is an 8 bit color, and a 24 bit color board, 
each with optional Z-buffer daughterboards.

 -- 

The nice thing about Windows is - It does not just crash, it displays a
dialog box and lets you press 'OK' first.
						-- Arno Schaefer