77 lines
2.0 KiB
NASM
77 lines
2.0 KiB
NASM
|
PAGE ,132
|
||
|
|
TITLE CALC
|
||
|
|
CGROUP GROUP CODESEG
|
||
|
|
CODESEG SEGMENT PARA PUBLIC 'CODE'
|
||
|
|
ASSUME CS:CGROUP,DS:CGROUP,ES:CGROUP
|
||
|
|
PUBLIC CALC
|
||
|
|
|
||
|
|
ORG 100H
|
||
|
|
|
||
|
|
CALC PROC FAR
|
||
|
|
JMP START
|
||
|
|
|
||
|
|
;---------------------------------------------------------------------;
|
||
|
|
; ;
|
||
|
|
; DATA AREA ;
|
||
|
|
; ;
|
||
|
|
;---------------------------------------------------------------------;
|
||
|
|
|
||
|
|
DB 'INTERRUPT NUMBER ='
|
||
|
|
INT_NUMBER DB 61h
|
||
|
|
|
||
|
|
SCREEN_HANDLE DW 0001h
|
||
|
|
|
||
|
|
MESSAGE DB 'PEMATH is not resident',13,10
|
||
|
|
MESSAGE_LEN EQU $-MESSAGE
|
||
|
|
|
||
|
|
TAG DB 'PEMATH'
|
||
|
|
TAG_LEN EQU $-TAG
|
||
|
|
|
||
|
|
;---------------------------------------------------------------------;
|
||
|
|
; ;
|
||
|
|
; CODE AREA ;
|
||
|
|
; ;
|
||
|
|
;---------------------------------------------------------------------;
|
||
|
|
|
||
|
|
START:
|
||
|
|
;---------------------------------------------------------------------;
|
||
|
|
; TEST FOR PRESENCE OF CALCULATOR ;
|
||
|
|
;---------------------------------------------------------------------;
|
||
|
|
SUB AX,AX
|
||
|
|
MOV ES,AX
|
||
|
|
SUB BH,BH
|
||
|
|
MOV BL,INT_NUMBER
|
||
|
|
SHL BX,1
|
||
|
|
SHL BX,1
|
||
|
|
MOV DI,ES:[BX]
|
||
|
|
MOV ES,ES:[BX+2]
|
||
|
|
ADD DI,4
|
||
|
|
LEA SI,TAG
|
||
|
|
MOV CX,TAG_LEN
|
||
|
|
REPE CMPSB
|
||
|
|
JE CALL_CALC
|
||
|
|
MOV BX,SCREEN_HANDLE
|
||
|
|
MOV CX,MESSAGE_LEN
|
||
|
|
LEA DX,MESSAGE
|
||
|
|
MOV AH,40h
|
||
|
|
INT 21h
|
||
|
|
JMP SHORT CALC_EXIT
|
||
|
|
;---------------------------------------------------------------------;
|
||
|
|
; CALL CALCULATOR ;
|
||
|
|
;---------------------------------------------------------------------;
|
||
|
|
CALL_CALC:
|
||
|
|
MOV AL,INT_NUMBER
|
||
|
|
MOV BYTE PTR INT_CODE,AL
|
||
|
|
DB 0CDh ; INT
|
||
|
|
INT_CODE:
|
||
|
|
DB 00h
|
||
|
|
NOP
|
||
|
|
NOP
|
||
|
|
|
||
|
|
CALC_EXIT:
|
||
|
|
INT 20h
|
||
|
|
|
||
|
|
CALC ENDP
|
||
|
|
|
||
|
|
CODESEG ENDS
|
||
|
|
END CALC
|