Int 10 Fn BF11  - Video - Compaq Extensions - Get Extended Environment     [b]

   AX = BF11h

Return: AL = BFh if supported
       CF clear
       ES:DI -> ASCII signature "COMPAQ"
       ES:SI -> advanced functionality table (see #0146)

Note:  supported by at least the QVision board and the LTE Lite and ProSignia
     ROM BIOSes

See Also: AX=1A00h,AX=BF03h

Bitfields for Compaq advanced video functionality:
Bit(s) Description (Table 0146)
 31    future graphics extensions (reserved, set to 0)
 30-16 reserved
 15-12 available video memory in 256K blocks, less one (0000 = 256K, etc.)
 11-8  reserved
 7 QVision modes supported
 6 Advanced VGA modes supported
 5 Accelerated VGA modes supported
 4 standard VGA modes supported
 3-2   reserved
 1 132-column modes supported
 0 reserved