Specifications

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AX = 4F04h DL = 02h load saved status
CX= Bit 0: Video-Hardware status
Bit 1: Video-BIOS status
Bit 2: Video-DAC status
Bit 3: SuperVGA status
ES:BX= buffer where status is saved
AL= 4Fh (as function is supported)
AH= 00h: OK
00h: OK
01h: error
AX = 4F05h BH=00h select memory screen window
BL= 00h: window A
01h: window B
address of window in screen memory (units)
DX= 4Fh (since function is supported)
AL= 00h: OK
AH= 01h: error
AX = 4F05h BH=01h return memory screen window
BL= 00h: window A
01h: window B
address of window in screen memory (units)
DX= 4Fh (since function is supported)
AL= 00h: OK
AH= 01h: error