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Simtel MSDOS 1992 December
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simtel1292_SIMTEL_1292_Walnut_Creek.iso
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msdos
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ega
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egablank.arc
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EGABLANK.SCR
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1986-09-10
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1KB
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67 lines
n egablank.com
a
jmp 0153 ; jmp initial
dw 0, 0
dw 0, 0
dw 0
cs: ; newint8:
cmp wo [010a],+00 ; check countdown
jz 0122 ; if zero, donothing
cs:
dec wo [010a] ; decrement countdown
jnz 0122 ; if not 0, donothing
push ax
mov al,00 ; byte to turn off
call 0142 ; call onoff
pop ax
cs:
jmp far [0102] ; jmp oldint8
cs: ; newint9:
cmp wo [010a],+00 ; check countdown
jnz 0136 ; if not 0, ok
push ax
mov al,20 ; byte to turn on
call 0142 ; call onoff
pop ax
cs: ; ok:
mov wo [010a],2000 ; set countdown
cs:
jmp far [0106] ; jmp oldint9
push dx ; onoff:
push ax
mov dx,03ba ; reset flip-flop
in al,dx ; for monochrome
mov dx,03da ; reset flip-flop
in al,dx ; for color
mov dx,03c0 ; attribute port
pop ax
out dx,al ; turn on or off
pop dx
ret
mov ax,3508 ; initial:
int 21
cs:
mov [0102],bx ;save oldint8
cs:
mov [0104],es
mov dx,010c ; set newint8
mov ax,2508
int 21
mov ax,3509
int 21
cs:
mov [0106],bx ; save oldint9
cs:
mov [0108],es
mov dx,0127 ; set newint9
mov ax,2509
int 21
mov dx,0153 ; bytes for resident
int 27 ; terminate
r cx
86
w
q