User manual

A. Jumper Configurations
113
W17-22
Maskable Interrupts - assigns up to nine interrupt sources to the interrupt controller
inputs. Each interrupt input has two possible sources selected by installing a jumper in
position "a" or position "b." Other combinations are possible with wire wrap techniques.
Interrupt inputs not used in the application must be masked in software.
Jumper Installed Interrupt Source Interrupt
†
W17a STD bus INTRQ4* IR5
W17b J2 pin 6 IR5
†
W18a STD bus INTRQ2* IR6
W18b J2 pin 8 IR6
†
W19a Printer IR7
W19b J2 pin 10 IR7
W20a Parallel I/O IR8
†
W20b Real Time Clock IR8
W21a Serial COM4 IR9
†
W21b STD bus INTRQ* IR9
†
W22a Serial COM3 IR13
W22b Math Coprocessor IR13
W23
When W26B is installed:
• W23A is reserved.
• W23B connects the 1284 port DMA request to the 386 EX DRQ1.
†
Factory default configuration for DOS systems.