User's Manual

2.2 Setting the Interrupt Level (IRQ)
The QS-100D allows the use of any interrupt level in the range IRQ2 to IRQ7,
IRQ10 to IRQ12, IRQ14, or IRQ15, selected using jumper pack J6. (Early
versions of the QS-100D are limited to IRQ2-7.) In Figure 6, the factory default
setting of IRQ3 is shown. To select a different IRQ, move the jumper to the
appropriate position on J6.
12
34567891011
IRQ7 IRQ2 IRQ3 IRQ4 IRQ5 IRQ6 IRQ11 IRQ12 IRQ14
IRQ15
IRQ10
13
14
15 16 17 18 19 20 21 22
12
J6
Default is IRQ 3
---
Figure 6 --- Interrupt level (IRQ) selection
2.3 Configuring Interrupt Sharing
All ports on the QS-100D share the same interrupt level. Jumper J7 can be used
to connect the UART generated interrupt directly to the selected IRQ. J7 can also
be used to enable an interrupt sharing circuit, allowing the QS-100D to share its
interrupt with another Quatech adapter supporting sharable interrupts. In either
case, the software driving the serial ports must determine which port or ports are
requesting service when an interrupt is generated. To maintain 100% ISA bus
compatibility, J7 should be set in the non-sharable mode.
non-sharable sharable
J7 --- Default is Sharable
1
2
3
1
2
3
Figure 7--- Sharable interrupt selection
2-4 Quatech Inc.