【正文】 NZ DELAY3 MOV AL,08H 。送08H MOV DX,289H OUT DX,AL MOV CX,0FFFFHDELAY4: DEC CX CMP CX,00 JNZ DELAY4 MOV AL,10H 。送10H MOV DX,289H OUT DX,AL MOV CX,0FFFFHDELAY5: DEC CX CMP CX,00 JNZ DELAY5 MOV AL,20H 。送20H MOV DX,289H OUT DX,AL MOV CX,0FFFFHDELAY6: DEC CX CMP CX,00 JNZ DELAY6 MOV AL,40H 。送40H MOV DX,289H OUT DX,AL MOV CX,0FFFFHDELAY7: DEC CX CMP CX,00 JNZ DELAY7 MOV AL,80H 。送80H MOV DX,289H OUT DX,Al MOV CX,0FFFFHDELAY8: DEC CX CMP CX,00 JNZ DELAY8 DEC BX 。依次從A到D輸入以上八個脈沖，可使其正轉(zhuǎn) CMP BX,00 JNE WORK 。循環(huán)，達到連續(xù)正轉(zhuǎn)的效果 MOV DX,288H IN AL,DX 。檢測A口第二位的開關(guān)狀態(tài) AND AL,00000010B CMP AL,00H 。若開關(guān)閉合 JZ T3 。則跳到T3 JMP S2 。否則重新循環(huán)轉(zhuǎn)動T3: MOV DX,28AH MOV AL,10H 。報警燈燈亮，報警器響起來，系統(tǒng)停止工作 OUT DX,AL MOV DX,288H IN AL,DX 。檢測A口第二位的開關(guān)狀態(tài) AND AL,00000010B CMP AL,00H 。若開關(guān)閉合 JZ T3 。則跳到T3 JMP S2 。否則 重新循環(huán)轉(zhuǎn)動S1 ENDP。B:S2 PROC NEAR MOV DX,28AH MOV AL,00H OUT DX,AL MOV AL,02H 。給第二個燈送低電平，使其亮 OUT DX,AL MOV BX,48WORK1: 。依次反向輸入脈沖，使其反轉(zhuǎn) MOV AL,80H 。送80H MOV DX,289H OUT DX,AL MOV CX,0FFFFHDELAY11: DEC CX CMP CX,00 JNZ DELAY11 MOV AL,40H 。送40H MOV DX,289H OUT DX,AL MOV CX,0FFFFHDELAY22: DEC CX CMP CX,00 JNZ DELAY22 MOV AL,20H 。送20H MOV DX,289H OUT DX,AL MOV CX,0FFFFHDELAY33: DEC CX CMP CX,00 JNZ DELAY33 MOV AL,10H 。送10H MOV DX,289H OUT DX,AL MOV CX,0FFFFHDELAY44: DEC CX CMP CX,00 JNZ DELAY44 MOV AL,08H 。送08H MOV DX,289H OUT DX,AL MOV CX,0FFFFHDELAY55: DEC CX CMP CX,00 JNZ DELAY55 MOV AL,04H 。送04H MOV DX,289H OUT DX,AL MOV CX,0FFFFHDELAY66: DEC CX CMP CX,00 JNZ DELAY66 MOV AL,02H 。送02H MOV DX,289H OUT DX,AL MOV CX,0FFFFHDELAY77: DEC CX CMP CX,00 JNZ DELAY77 MOV AL,01H 。送01H MOV DX,289H OUT DX,Al MOV CX,0FFFFHDELAY88: DEC CX CMP CX,00 JNZ DELAY88 DEC BX CMP BX,00 JNZ WORK1 。循環(huán)使其連續(xù)反轉(zhuǎn) MOV DX,288H IN AL,DX 。檢測A口第二位的開關(guān)狀態(tài) AND AL,00000010B CMP AL,00H 。若開關(guān)閉合 JZ T4 。則跳到T4 JMP S3 。否則重新循環(huán)轉(zhuǎn)動T4: MOV DX,28AH MOV AL,10H 。報警燈燈亮，報警器響起來，系統(tǒng)停止工作 OUT DX,AL MOV DX,288H IN AL,DX 。檢測A口第二位的開關(guān)狀態(tài) AND AL,00000010B CMP AL,00H 。若開關(guān)閉合 JZ T4 。則跳到T4 JMP S3 。否則 重新循環(huán)轉(zhuǎn)動S2 ENDP。CS3 PROC NEAR MOV DX,28AH MOV AL,00H OUT DX,AL MOV AL,04H 。給第三個燈送低電平，使其亮 OUT DX,AL MOV DX,290H MOV AL,00H UP: MOV CX,0FFFFH DELAY000: DEC CX CMP CX,00 JNZ DELAY000 MOV CX,0FFFFH DELAY001: DEC CX CMP CX,00 JNZ DELAY001 OUT DX,AL 。直流電機加速轉(zhuǎn)動 INC AL CMP AL,0FFH JNE UP MOV AH,AL MOV DX,288H IN AL,DX 。檢測A口第二位的開關(guān)狀態(tài) AND AL,00000010B CMP AL,00H 。若開關(guān)閉合 JZ T8 。則跳到T8 JMP S6 。否則重新循環(huán)轉(zhuǎn)動T8: MOV DX,28AH MOV AL,10H 。報警燈燈亮，報警器響起來，系統(tǒng)停止工作 OUT DX,AL MOV DX,288H IN AL,DX 。檢測A口第二位的開關(guān)狀態(tài) AND AL,00000010B CMP AL,00H 。若開關(guān)閉合 JZ T8 。則跳到T8 JMP S6 。否則 重新循環(huán)轉(zhuǎn)動S3 ENDP S6 PROC NEAR MOV DX,28AH MOV AL,00H OUT DX,AL MOV AL,08H 。給第四個燈送低電平，使其亮 OUT DX,AL MOV DX,290H MOV AL,AH DOWN: MOV CX,0FFFFH DELAY003: DEC CX CMP CX,00 JNZ DELAY003 MOV CX,0FFFFH DELAY004: DEC CX CMP CX,00 JNZ DELAY004 OUT DX,AL 。直流電機減速轉(zhuǎn)動 DEC AL CMP AL,00H JNZ DOWN S6 ENDPS4 PROC NEAR MOV DX,288H IN AL,DX 。檢測A口第二位的開關(guān)狀態(tài) AND AL,00000010B CMP AL,00H 。若開關(guān)閉合 JZ T2 。則跳到T2 JMP A 。否則重新循環(huán)轉(zhuǎn)動T2: MOV DX,28AH MOV AL,10H 。報警燈燈亮，報警器響起來，系統(tǒng)停止工作 OUT DX,AL MOV DX,288H IN AL,DX 。檢測A口第二位的開關(guān)狀態(tài) AND AL,00000010B CMP AL,00H 。若開關(guān)閉合 JZ T2 。則跳到T2 JMP A 。否則 重新循環(huán)轉(zhuǎn)動S4 ENDP CODE ENDSEND START 41