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Step 3: Configuring the GP488B Interface Interrupt (IRQ)
1. The factory default Interrupt (IRQ) is 7. If this creates a conflict, reset SW1 microswitches 1, 2,
and 3, and jumper J4 according to the figure. The switch and jumper settings must both indicate the
same interrupt level for correct operation with interrupts.
2. If reset, record the new Interrupt (IRQ) being used.
The GP488B interface board may be set to interrupt the PC on the occurrence of certain hardware
conditions. The level of the interrupt generated is set by J4. The GP488B adheres to the "AT-style"
interrupt sharing conventions. When an interrupt occurs, the interrupting device must be reset by
writing to I/O address
is set by switches 1, 2, and 3 of SW1 which must be set to correspond to the J4 interrupt level setting.
26
Personal488 (with GP488B)
, where X is the interrupt level (from 0 to 7). This interrupt response level
02FX
Personal488 User's Manual For Windows95 and Windows NT
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