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AH = C0h
Return: CF = 1 if BIOS doesn't support call
ES:BX pointer to ROM table
byte_count dw ? ; number of bytes following
model db ? ; PC=ff, XT=fe or fb, PCjr = fd, etc, etc
submodel db ? ; distingushes between AT and XT/286, etc.
BIOS_rev db ? ; 0 for first release, 1 for 2nd, etc.
featbyte db ? ; 80h = DMA channel 3 used by hd BIOS
; 40h = 2nd 8259 installed
; 20h = Real-Time Clock installed
; 10h = INT 15h called upon INT 9h
; 8h = wait for external event supported
; 4h = extended BIOS area allocated at 640K
; 2h = bus is Micro Channel instead of PC
; 1h reserved
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