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Some interrupts are fixed, others can be re-assigned. The following
table lists the interrupts used by the computer and shows which may
be available for use by expansion cards.
IRQ
IRQ0
IRQ1
IRQ2
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
IRQ8
IRQ9
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
With the BIOS Set-up utility IRQs 3 and 4 are available if you
disable serial ports 2 and 1 respectively. Similarly, if you have no
intention of using the parallel port, you can disable it with the BIOS
Set-up utility, freeing IRQ7. Do not disable ports unless you have
no intention of using them.
Direct memory access (DMA) channel
Some hardware devices can use a DMA channel to access system
memory without directly burdening the processor. Computers have
DMA channels numbered DMA0 to DMA7.
Default assignment
System timer
Keyboard controller
PIC daisy chain
Serial port 2
Serial port 1
Diskette controller
Parallel port
Real time clock
Mouse
Coprocessor
Primary ATA/IDE interface
Secondary ATA/IDE interface
*If SCSI controller card fitted
S Y S T E M E X P A N S I O N
Available?
No
No
No
Optionally
Optionally
Yes
No
Optionally
No
Yes
Yes
Yes
No
No
Optionally*
Optionally*
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   Also See for Mitsubishi Electric Apricot LS

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