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1.4) Interrupt Enable/Disable Jumpers
The IRQ lines on the PC 62C Board are active high but are tri-stated upon powerup.
Certain non-compatible computer cards does not like this type of configuration. In
certain cases, some IRQ lines are already occupied by certain Plug and Play Cards.
Provision was hence made to disconnect the unused IRQ lines from the ISA BUS
completely. By removing the jumper, you automatically disconnect the IRQ line from the
BUS. Examples of jumper settings are as follows:
IRQ 3 ENABLED
I5 I2I7I3
IRQ EN/DIS
LK1
I15 I11I12 I10
IRQ 12 ENABLED
IRQ EN/DIS
LK2
ALL IRQs DISABLED
IRQ EN/DIS
LK1
I15 I11I12 I10
ALL IRQs DISABLED
IRQ EN/DIS
LK2
IRQ 3,5,7,2 ENABLED
IRQ EN/DIS
LK1
I15 I11I12 I10
IRQ 15,12,10 ENABLED
IRQ EN/DIS
LK2
IRQ 2,3,7 ENABLED
IRQ EN/DIS
LK1
I15 I11I12 I10
IRQ 10,15 ENABLED
IRQ EN/DIS
LK2
I5 I2I7I3
I5 I2I7I3
I5 I2I7I3
Figure 3a: IRQ Enable/Disable Jumper Settings