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CODESEGMENTASSUMECS:CODE,DS:CODEORG3000HBEGIN:JMPP8259BUFDB6DUP(?)Port0EQU0FFE0H；8259端口Port1EQU0FFE1H；8259端口ZXKEQU0FFDCH；字形口地址ZWKEQU0FFDDH；字位口地址P8259:CLI；屏蔽中断CALLWPMOVAX,OFFSETINT8259MOVBX,003CHMOV[BX],AXMOVBX,003EHMOVAX,0000HMOV[BX],AXMOVAL,13H；初始化命令字1MOVDX,Port0；A0=0OUTDX,ALMOVAL,0FH；初始化命令字2MOVDX,Port1；A0=1OUTDX,ALMOVAL,01H；初始化命令字4OUTDX,ALMOVAL,7FH；操作命令字1OUTDX,ALMOVSI,0000hSTI；开中断CON8:CALLDISJMPCON8INT8259PROCNEARCLIPUSHAXPUSHBXPUSHDXMOVBX,OFFSETBUFMOVBYTEPTR[BX+SI],0F8H；数码管显示“7”INCSICMPSI,0007HJNZX59MOVSI,0000HCALLWPX59:MOVAL,20H；操作命令字2MOVDX,Port0；A0=0OUTDX,ALEXIT:POPDXPOPBXPOPAXSTIIRETINT8259ENDPWPPROCNEARMOVBUF,0CH；数码管显示“P.”MOVBUF+1,0FFH；数码管全灭MOVBUF+2,0FFHMOVBUF+3,0FFHMOVBUF+4,0FFHMOVBUF+5,0FFHRETWPENDPDISPROCNEARMOVCL,20HMOVBX,OFFSETBUFDIS1:MOVAL,[BX]MOVDX,ZXKOUTDX,ALMOVAL,CLMOVDX,ZWKOUTDX,ALPUSHCXMOVCX,0100HDISP:LOOPDISPPOPCXCMPCL,01HJZEXIT1INCBXSHRCL,1JMPDIS1EXIT1:RETDISENDPCODEENDSENDBEGINIR7的地址ICW1ICW2中断向量码ICW4OCW1OCW2
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