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1、实验4－8259中断实验STACKSEGMENTSTACKDW64DUP(?)STACKENDSCODESEGMENTASSUMECS:CODE，SS:STACKSTART:PUSHDS;保存数据段MOVAX,0000HMOVDS,AX；数据段清0MOVAX,OFFSETIRQ7；取中断程序入口地址（相对地址）ADDAX,2000H；加装载时IP＝2000H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＝0000HMOVSI,003EHMOV[SI],AX；填段地址向量CLI；关中段POPDSINAL
2、,21H；读8259中断屏蔽字ANDAL,7FH；开8259中断7OUT21H,ALMOVCX,000AHA1:CMPCX,0000HJNZA2INAL,21HORAL,80HOUT21H,ALSTIHLTA2:STIJMPA1；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INT10HDECCXMOVAL,20HOUT20H,ALCLIIRETCODEENDSENDSTART实验4－8259中断实验注意: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=2000H,故装
3、载时一定按此填入CS与IP地址.后面实验不再重述).分析程序·问题？·实验考试如果改变为IRQ3,或其它，程序应如何改动？实验5－8255并行接口应用实验(1)STACKSEGMENTSTACKDW64DUP(?)STACKENDSCODESEGMENTASSUMECS:CODE，SS:STACKSTART:MOVAL,83H;10000011OUT63H,ALA1:INAL,61HOUT60H,ALJMPA1CODEENDSENDSTART实验5－8255并行接口应用实验(2)STACKSEGMENTSTACKDW64DUP(?)STACKENDSCODESEGMENTASSUME
4、CS:CODESTART:CLI;关中断MOVAL,86H;控制字1000'0110OUT63H,ALMOVAL,05H;控制字00000101pc2置位，kk1下降沿触发OUT63H,ALMOVAX,0000HMOVDS,AXMOVAX,OFFSETIRQ7ADDAX,2000HMOVSI,003CHMOV[SI],AXMOVAX,0000HMOVSI,003EHMOV[SI],AXINAL,21HANDAL,7FHOUT21H,ALA1:STI;开中断HLTJMPA1IRQ7:INAL,61HOUT60H,ALMOVAL,20HOUT20H,ALIRETCODEENDSENDST
5、ARTSTACKSEGMENTSTACKDW256DUP(?)STACKENDSDATASEGMENTTABLEDB01H,03H,02H,06H,04H,0CH,08H,09HDATAENDSCODESEGMENTASSUMECS:CODE,DS:DATASTART:MOVAX,DATAMOVDS,AXMAIN:MOVAL,90HOUT63H,ALA1:MOVBX,OFFSETTABLEMOVCX,0008HA2:MOVAL,[BX]OUT61H,ALCALLDALLYINCBXLOOPA2JMPA1DALLY:PUSHCXMOVCX,5000HA3:PUSHAXPOPAXLOOP
6、A3POPCXRETCODEENDSENDSTART实验6－8253计数器应用实验设定8253的2#通道工作方式为方式0，用于事件计数，当计数值为5时，发出中断请求信号，显示“M”。实验部分程序如下：Stacksegmentstackdw64dup(?)StackendsCodesegmentassumess:code,ss:stackStart:inal,21handal,7fhout21h,alMOVAL,90HOUT43H,ALA1:MOVAL,05HOUT42H,ALhltstijmpa1movax,014dhint10hmovax,0120hint10hMoval,20ho
7、ut20h,aliretCodeendsendstart实验6－8253计数器应用实验(2)实验6－8253计数器应用实验(2)实验6－8253计数器应用实验(2)STACKSEGMENTSTACKDW64DUP(?)STACKENDSCODESEGMENTASSUMECS:CODESTART:PUSHDSMOVAX,0000HMOVDS,AXMOVAX,OFFSETIRQ0ADDAX,2000HMOVSI,0020HMOV[SI],AXMOVAX,000
