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Monster Media 1993 #2
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tame21.zip
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TAME21.ASM
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Assembly Source File
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1993-07-24
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1KB
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52 lines
; masm 5.10a
;
; masm tame21;
; link /tiny tame21;
;
; p.fitzsimmons 93/7/24
CSEG SEGMENT PARA PUBLIC 'CODE'
ASSUME CS:CSEG
ORG 100H
begin: jmp start
OLD_2F dd ? ; this is in the code seg!
isr0x2f proc near
pushf
cmp ax, 1680h
je Mine
popf
jmp cs:[old_2f] ; not for us. Chain to next 2f handler.
Mine: popf
sti
xor dx,dx
mov ax,1 ; Number of milliseconds in DX:AX, a
; value of 0 means that the current
; timeslice is released.
hlt ; Call OS/2.
db 35h,0CAh ; Signature to differentiate between a
; normal HLT-instruction and the call to
; DosSleep().
iret
isr0x2f endp
start proc near
mov ax,352fh ;get int2f adr; returns in es:bx
int 21h
mov word ptr cs:OLD_2F+0, bx
mov word ptr cs:OLD_2F+2, es
mov dx, offset isr0x2f
mov ax,252fh ;set int2f adr to ds:dx
int 21h
; t&sr
mov dx, offset start
int 27h
start endp
CSEG ENDS
end begin