用户程序
R3-6
NO
RTI
R1--;
R30?
R3-10;
.ORIG x3000
R1-mem[SaveR1];
YES
R6-StackPointer;(初始化栈指针)
PUTS\"\\";
R2--;
R20?
DELAY
START
R1=0?
RET;
R2=0?
.ORIG x2000
Address_KBDR\t.FILL xFE02Address_KBSR\t.FILL xFE00Address_DDR\t.FILL xFE06Address_DSR\t.FILL xFE04LineFeed\t.FILL x000A_LineFeed\t.FILL xFFF6SaveChar\t.BLKW 1SaveR0\t\t.BLKW 1SaveR1\t\t.BLKW 1SaveR2\t\t.BLKW 1SaveR3\t\t.BLKW 1
StackPointer\t.FILL x3000KIVTE .FILL x0180\tInterruptAddr\t.FILL x2000Enable\t.FILL x4000\tAddress_KBDR\t.FILL xFE02Address_KBSR\t.FILL xFE00Address_DDR\t.FILL xFE06Address_DSR\t.FILL xFE04COUNT \t.FILL x8000SaveR1 .BLKW 1Letter_I\t.FILL x0049Letter_C\t.FILL x0043Letter_S\t.FILL x0053Space\t.FILL x0020LineFeed\t.FILL x000A
PUTS\" \";(3个空格符)
中断服务程序
mem[SaveR1]-R1;R1-COUNT;
PUTS\"ICS\";
R2-6
R3--;
R10?
