简介
分别使用AH=0中断方式、AH=1轮询方式读取键盘按键，并输出按键的扫描码和ASCII码。ESC键退出程序
程序运行结果
image.png
代码
- AH=0中断方式
ASSUME CS:CODE1,DS:DATA1,SS:STACK1
STACK1 SEGMENT STACK
STACK_AREA DW 200H DUP(?)
STACK_BTM EQU $-STACK_AREA
STACK1 ENDS
DATA1 SEGMENT
EXPLAIN_MODE_SELECT DB 13,10,"please select mode:1.read key from keyboard. 2.read key from buffer. other.quit",13,10,'$'
EXPLAIN_INPUT DB 13,10,"please press any key:",13,10,'$'
EXPLAIN_OUTPUT_SCAN DB 13,10,"scan code:",'$'
EXPLAIN_OUTPUT_ASCII DB 13,10,"ascii code:",'$'
ASCII DB 20H DUP(0)
DATA1 ENDS
CODE1 SEGMENT
MAIN PROC NEAR
MOV AX,STACK1
MOV SS,AX
MOV SP,STACK_BTM
MOV AX,DATA1
MOV DS,AX
MOV ES,AX
MOV AH,09H
MOV DX,OFFSET EXPLAIN_INPUT
INT 21H
MAIN_LOOP_1:
MOV AH,0 ;中断方式读取按键
INT 16H
MOV CL,AL
XOR CH,CH
MOV BL,AH
XOR BH,BH
MOV AH,09H
MOV DX,OFFSET EXPLAIN_OUTPUT_ASCII
INT 21H
PUSH CX
CALL OUTPUT_NUM_DEC
MOV AH,09H
MOV DX,OFFSET EXPLAIN_OUTPUT_SCAN
INT 21H
PUSH BX
CALL OUTPUT_NUM_DEC
CMP BX,1
JNZ MAIN_LOOP_1
MOV AX,4C00H
INT 21H
MAIN ENDP
OUTPUT_NUM_DEC PROC NEAR ;[SP+2]:num
PUSH BP
MOV BP,SP
PUSH SI
PUSH DI
PUSH AX
PUSH BX
PUSH CX
PUSH DX
MOV AX,[BP+4]
MOV SI,10
MOV DI,0
MOV BP,OFFSET ASCII
HEX2DEC_LOOP2:
MOV DX,0
MOV CX,10
DIV CX
MOV DS:[BP+DI],DL
INC DI
CMP AX,0
JNE HEX2DEC_LOOP2
MOV CX,DI
HEX2DEX_LOOP3:
DEC DI
MOV DL,DS:[BP+DI]
PUSH DX
CALL OUTPUT_NUM
LOOP HEX2DEX_LOOP3
POP DX
POP CX
POP BX
POP AX
POP DI
POP SI
POP BP
RET 2
OUTPUT_NUM_DEC ENDP
OUTPUT_NUM PROC NEAR ;[SP+2]:num(byte)
PUSH BP
MOV BP,SP
PUSH AX
PUSH DX
MOV DL,[BP+4]
CMP DL,9
JA OUTPUT_NUM_ALPHA
ADD DL,'0'
JMP OUTPUT_NUM_OUTPUT
OUTPUT_NUM_ALPHA:
ADD DL,'A'-10
OUTPUT_NUM_OUTPUT:
MOV AH,02H
INT 21H
POP DX
POP AX
POP BP
RET 2
OUTPUT_NUM ENDP
CODE1 ENDS
END MAIN
- AH=1轮询方式
ASSUME CS:CODE1,DS:DATA1,SS:STACK1
STACK1 SEGMENT STACK
STACK_AREA DW 200H DUP(?)
STACK_BTM EQU $-STACK_AREA
STACK1 ENDS
DATA1 SEGMENT
EXPLAIN_MODE_SELECT DB 13,10,"please select mode:1.read key from keyboard. 2.read key from buffer. other.quit",13,10,'$'
EXPLAIN_INPUT DB 13,10,"please press any key:",13,10,'$'
EXPLAIN_OUTPUT_SCAN DB 13,10,"scan code:",'$'
EXPLAIN_OUTPUT_ASCII DB 13,10,"ascii code:",'$'
ASCII DB 20H DUP(0)
DATA1 ENDS
CODE1 SEGMENT
MAIN PROC NEAR
MOV AX,STACK1
MOV SS,AX
MOV SP,STACK_BTM
MOV AX,DATA1
MOV DS,AX
MOV ES,AX
MOV AH,09H
MOV DX,OFFSET EXPLAIN_INPUT
INT 21H
MAIN_LOOP_1:
TRY_READ: ;轮询方式读取按键
MOV AH,0
INT 16H
JZ TRY_READ
MOV CL,AL
XOR CH,CH
MOV BL,AH
XOR BH,BH
MOV AH,09H
MOV DX,OFFSET EXPLAIN_OUTPUT_ASCII
INT 21H
PUSH CX
CALL OUTPUT_NUM_DEC
MOV AH,09H
MOV DX,OFFSET EXPLAIN_OUTPUT_SCAN
INT 21H
PUSH BX
CALL OUTPUT_NUM_DEC
CMP BX,1
JNZ MAIN_LOOP_1
MOV AX,4C00H
INT 21H
MAIN ENDP
OUTPUT_NUM_DEC PROC NEAR ;[SP+2]:num
PUSH BP
MOV BP,SP
PUSH SI
PUSH DI
PUSH AX
PUSH BX
PUSH CX
PUSH DX
MOV AX,[BP+4]
MOV SI,10
MOV DI,0
MOV BP,OFFSET ASCII
HEX2DEC_LOOP2:
MOV DX,0
MOV CX,10
DIV CX
MOV DS:[BP+DI],DL
INC DI
CMP AX,0
JNE HEX2DEC_LOOP2
MOV CX,DI
HEX2DEX_LOOP3:
DEC DI
MOV DL,DS:[BP+DI]
PUSH DX
CALL OUTPUT_NUM
LOOP HEX2DEX_LOOP3
POP DX
POP CX
POP BX
POP AX
POP DI
POP SI
POP BP
RET 2
OUTPUT_NUM_DEC ENDP
OUTPUT_NUM PROC NEAR ;[SP+2]:num(byte)
PUSH BP
MOV BP,SP
PUSH AX
PUSH DX
MOV DL,[BP+4]
CMP DL,9
JA OUTPUT_NUM_ALPHA
ADD DL,'0'
JMP OUTPUT_NUM_OUTPUT
OUTPUT_NUM_ALPHA:
ADD DL,'A'-10
OUTPUT_NUM_OUTPUT:
MOV AH,02H
INT 21H
POP DX
POP AX
POP BP
RET 2
OUTPUT_NUM ENDP
CODE1 ENDS
END MAIN
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