Installation Guide
PC Elite Reference
IRQ14 is the AT/386/486 hard disk interrupt.
When in PC2a compatible mode the position of the jumper
MUST match the IRQ level set in the software and the IRQ
acknowledge address set on DIPs 4-6 and IRQ choices are thus
restricted to IRQ2-7.
If in doubt leave in the jumper in the factory set condition,
interrupt 7.
Setting The Interrupt Clear Address.
PC2A Only
________________________________
__________
When in PC2a mode the interrupt clear address on DIPs 4-
6, must be set correctly if the interrupts generated by the ELITE
card are to properly serviced by your software. Whilst DIP
switches 4-6 can be used to select one of 8 different interrupt
clear addresses they should only be set to one of the six valid
addresses and the IRQ jumper MUST be set correspondingly.
When in PC2 mode, DIP 3=ON, then DIPS 4-6 have no
effect.
Figure 2-4. The PC2a Mode IRQ Clear Address.
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DIP 4 DIP 5 DIP 6
Interrupt as selected by jumper
_____ _____ _____
_______________________________
Off
Off
Off
0 Not Valid DO NOT USE THIS SETTING !
On
Off
Off
1 Not Valid DO NOT USE THIS SETTING !
Off
On
Off
2 Place jumper at Interrupt 2
On
On
Off
3 Place jumper at Interrupt 3
Off
Off
On
4 Place jumper at Interrupt 4
On
Off
On
5 Place jumper at Interrupt 5
Off
On
On
6 Place jumper at Interrupt 6
On
On
On
7 Place jumper at Interrupt 7 THE DEFAULT.
DMA Selection.
______________
The PC ELITE card can perform its input or output under
DMA control, that is the data moves between the PC and the
IEEE devices in the background whilst the computer is
Chapter 2
2-15
