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Interrupt Service Routine

How can I write an interrupt service routine that performs all the required functions in Assembly, but the input device is serviced only if a special location, MOD, contains all 1's. The output device is serviced only if location MOD contains all 0's.

Reply to
oozypal
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Er, test MOD for 00H and FFH in the ISR first (assuming we are talking 8 bits here).

Ian

Reply to
Ian Bell

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