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- ;
- ; *** Listing 8-11 ***
- ;
- ; Sets the BIOS equipment flag to select an 80-column
- ; color monitor.
- ; Uses accumulator-specific MOV, AND, and OR instructions.
- ;
- call ZTimerOn
- rept 1000
- sub ax,ax
- mov es,ax ;point ES to the segment at 0
- mov al,es:[410h] ;get the equipment flag
- and al,not 30h ;mask off the adapter bits
- or al,20h ;set the adapter bits to select
- ; 80-column color
- mov es:[410h],al ;set the new equipment flag
- endm
- call ZTimerOff