SDPSC9: GEM VGA screen driver
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  This file contains disassembled source for SDPSC9, the VGA driver used in 
GEM/3. The reassembled file appears to work correctly.

  Compared to the original GEM version of SDPSC9, this file has one extra
function, which I've called v_delay(). It's simply a wrapper around the
BIOS's microsecond delay functionality, and should be called with:

function = 1000
#ptsin   = 0
#intin   = 2
intin[0] = low word of delay (microseconds)
intin[1] = high word of delay (microseconds)

