硬件实验解答

试验4－8259中断试验STACKSEGMENTSTACK DW64DUP(?)STACKENDSCODESEGMENT ASSUMECS:CODE，SS:STACKSTART:PUSHDS;保存数据段

MOVAX,0000H

MOVDS,AX；数据段清0

MOVAX,OFFSETIRQ7；取中断程序入口地址（相对地址）

ADDAX,2023H；加装载时IP＝2023H地址（绝对地址）

MOVSI,003CH；填8259中断7中断向量

MOV[SI],AX；填偏移地址 MOVAX,0000H；段地址CS＝0000H

MOVSI,003EH

MOV[SI],AX；填段地址向量 CLI；关中段 POPDS

INAL,21H；读8259中断屏蔽字

ANDAL,7FH；开8259中断7

OUT21H,AL MOVCX,000AHA1: CMPCX,0000H JNZA2 INAL,21H ORAL,80H OUT21H,AL STI HLTA2: STI JMPA1；断点

IRQ7: MOVAX,0137H；中断程序入口地址

INT10H；BIOS功能调用， MOVAX,0120H；显示“7”和空格 INT10H DECCX

MOVAL,20H

OUT20H,AL CLI IRET CODEENDSENDSTART试验4－8259中断试验注意:程序中8259中断向量地址为绝对地址,已定义为段地址CS=0000H,偏移地址IP=2023H,故装载时一定按此填入CS与IP地址.背面试验不再重述).分析程序

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问题？

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试验考试假如变化为IRQ3,或其他，程序应怎样改动？试验5－8255并行接口应用试验(1)STACKSEGMENTSTACK DW64DUP(?)STACKENDSCODESEGMENT ASSUMECS:CODE，SS:STACKSTART:MOVAL,83H;10000011 OUT63H,ALA1: INAL,61H OUT60H,AL

JMPA1CODEENDSENDSTART试验5－8255并行接口应用试验(2)STACKSEGMENTSTACK DW64DUP(?)STACKENDSCODESEGMENT ASSUMECS:CODESTART:CLI;关中断

MOVAL,86H;控制字1000'0110

OUT63H,AL

MOVAL,05H;控制字00000101pc2置位，kk1下降沿触发

OUT63H,AL

MOVAX,0000H

MOVDS,AX MOVAX,OFFSETIRQ7 ADDAX,2023HMOVSI,003CH MOV[SI],AX

MOVAX,0000H MOVSI,003EH MOV[SI],AX INAL,21H ANDAL,7FH OUT21H,ALA1: STI;开中断

HLT JMPA1IRQ7: INAL,61H OUT60H,AL MOVAL,20H OUT20H,AL IRETCODEENDSENDSTARTSTACKSEGMENTSTACKDW256DUP(?)STACKENDSDATASEGMENTTABLE DB01H,03H,02H,06H,04H,0CH,08H,09HDATAENDSCODESEGMENTASSUMECS:CODE,DS:DATASTART:MOVAX,DATAMOVDS,AXMAIN:MOV AL,90H OUT 63H,ALA1: MOV BX,OFFSETTABLEMOV CX,0008H A2: MOV AL,[BX] OUT 61H,AL CALL DALLY INC BXLOOP A2 JMP A1DALLY: PUSH CX MOV CX,5000HA3: PUSH AX POP AX LOOP A3 POP CX RET CODEENDSENDSTART 试验6－8253计数器应用试验设定8253旳2#通道工作方式为方式0，用于事件计数，当计数值为5时，发出中断祈求信号，显示“M”。试验部分程序如下：Stacksegmentstackdw64dup(?)StackendsCodesegmentassumess:code,ss:stackStart:inal,21handal,7fhout21h,al

MOVAL,90H OUT43H,ALA1: MOVAL,05H

OUT42H,AL

hltstijmpa1

movax,014dhint10h

movax,0120hint10h

Moval,20hout20h,aliretCodeendsendstart

试验6－8253计数器应用试验(2)试验6－8253计数器应用试验(2)试验6－8253计数器应用试验(2)STACKSEGMENTSTACK DW64DUP(?)STACKENDSCODESEGMENT ASSUMECS:CODESTART:PUSHDS MOVAX,0000H MOVDS,AX MOVAX,OFFSETIRQ0 ADDAX,2023H MOVSI,0020H MOV[SI],AX MOVAX,0000H MOVSI,0022H MOV[SI],AX POPDSMOVAL,0FCH OUT21H,AL MOVAL,15H OUT43H,AL MOVAL,0FFH OUT40H,AL MOVDL,30HA1: STI JMPA1IRQ0: MOVAH,01H MOVAL,DLCMPAL,3AH JNZA2 MOVAL,0DH INT10H试验6－8253计数器应用试验(2)MOVAL,30HA2: INT10H INCAX