IRQ : Java Glossary

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IRQ
Interrupt Request. A computer has 7 to 15 "shoulders ", each attached to a wire running the length of the computer bus. A device can demand the computer’s immediate attention by sending a pulse down one of these wires. You must assign com1: and com3: to IRQ 4 and com2: and com4: to IRQ 3. If you don’t the computer will not know it was your serial port that needed attention.
IRQ in the Computer Hardware Buyers’ Glossary
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