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MOUSEINT.ASM
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Assembly Source File
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1992-05-13
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1KB
|
53 lines
;MOUSEINT.ASM - dedicated mouse interrupt calling routine
;Copyright (c) 1991 Ethan Winer
.Model Medium, Basic
MouseRegs Struc
RegAX DW ?
RegBX DW ?
RegCX DW ?
RegDX DW ?
Segmnt DW ?
MouseRegs Ends
.Code
MouseInt Proc Uses SI DS ES, MRegs:Word
Mov SI,MRegs ;get the address of MouseRegs
Mov AX,[SI+RegAX] ;load each register in turn
Mov BX,[SI+RegBX]
Mov CX,[SI+RegCX]
Mov DX,[SI+RegDX]
Mov SI,[SI+Segmnt] ;see what the segment is
Or SI,SI ;is it zero?
Jz @F ;yes, skip ahead and use default
Cmp SI,-1 ;is it -1?
Je @F ;yes, skip ahead
Mov DS,SI ;use the segment specified
@@:
Push DS ;either way, assign ES=DS
Pop ES
Int 33h ;call the mouse driver
Push SS ;regain access to MouseRegs
Pop DS
Mov SI,MRegs ;access MouseRegs again
Mov [SI+RegAX],AX ;save each register in turn
Mov [SI+RegBX],BX
Mov [SI+RegCX],CX
Mov [SI+RegDX],DX
Ret ;return to BASIC
MouseInt Endp
End