Interrupt_service_routine
2015-08-11 00:10:49 0 举报interrupt
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Initializion:save all the regs needed
R1 for statusR2 for countingR3 for I/O charsR5 is in the user_program used for judging the pattern
NO
put the input char into R3
show the input char on the monitor 10 times
YES
load back all the regs and return
check KBSR to see if there is a key struck
check DSR to see if the monitor is ready to output a char
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