Category : Files from Magazines
Archive   : JUL91.ZIP
Filename : 2N07048A

PAGE 57,130
TITLE ^Break and ^C and Prtscn
NAME BREAK

; ========================================================================
; DESC: These routines disable and enable the special
; interrupt keyboard buttons.
;
; INTERRUPTS: 0x23 ^C
; 0xlB ^Break
; 0x05 Prtscn
;
; REVISIONS: JT Jewell 91/01/28.
;
; COMPILER: Microsoft Assembler Ver 5.10A
;
; COMPILE: masm break.asm,break.obj;
;
; ROUTINES: To call the routines from C:
; DISABLE BREAK();
; ENABLE_BREAK(),
; ========================================================================


_TEXT SEGMENT PUBLIC 'CODE'
ASSUME CS:_TEXT
ASSUME DS:_TEXT

PUBLIC _DISABLE_BREAK


; ******************************************

_DISABLE_BREAK PROC NEAR

PUSH BP
MOV BP,SP

PUSH DS
PUSH DI
PUSH SI
PUSH ES

MOV AX, 3523H ; SAVE ORIGINAL 0x23 Handle.
INT 21H
MOV word ptr cs:ORG_INT23,bx
MOV word ptr cs:ORG_INT23+2,es

MOV AX, 351BH ; SAVE ORIGINAL 0xlB Handle.
INT 21H
MOV word ptr cs:ORG_INT1B,bx
MOV word ptr cs:ORG_INT1B+2,es

MOV AX, 3505H ; SAVE ORIGINAL 0x05 Handle.
INT 21H
MOV word ptr cs:ORG_INT05,bx
MOV word ptr cs:ORG_INT05+2,es

MOV dx,seg _TEXT:NULL_BREAK
MOV ds,dx

MOV dx,offset _TEXT:NULL_BREAK

MOV ax,2523H ; SET INT 23H VECTOR
INT 21H

MOV ax,251BH ; SET INT lBH VECTOR
INT 21H

MOV ax,2505H ; SET INT 05H VECTOR
INT 21H

POP ES
POP SI
POP DI
POP DS
POP BP
RET

_DISABLE_BREAK ENDP


; *******************************************

PUBLIC _ENABLE_BREAK

_ENABLE_BREAK PROC NEAR

PUSH BP
MOV BP,SP

PUSH DS
PUSH DI
PUSH SI
PUSH ES

LDS DX,cs:ORG_INT23 ; RETRIEVE PREVIOUS INT23
MOV AX,2523H
INT 21H

LDS DX,cs:ORG_INT1B ; RETRIEVE PREVIOUS INTlB
MOV AX,251BH
INT 21H

LDS DX,cs:ORG_INT05 ; RETRIEVE PREVIOUS INT05
MOV AX,2505H
INT 21H

POP ES
POP SI
POP DI
POP DS
POP BP
RET

_ENABLE_BREAK ENDP


;*******************************************

NULL_BREAK PROC FAR

IRET

NULL_BREAK ENDP


; *******************************************

ORG_INT23 dd 0
ORG_INT1B dd 0
ORG_INT05 dd 0


; ******************************************

_TEXT ENDS
END