02748.pdf

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SENSATION!

(250-1651)

DMA\IRQ Assignments

Faxback Doc. # 2748

SYSTEM RESOURCES

The tables in this section list the interrupt and DMA channel as

assignments used in the system.

NOTE:

Unavailable DMA channels are used internally and cannot be

disabled.

DMA ASSIGNMENTS

┌───────────────────────────────────────────┬────────────────────┐

│Device/Circuit.............................│DMA

Channel

│

├───────────────────────────────────────────┼────────────────────┤

│Audio

adapter (default for 8-bit PCM)......│DMA1

│

├───────────────────────────────────────────┼────────────────────┤

│Diskette

Drive Interface/ISA bus

│DMA2

│

├───────────────────────────────────────────┼────────────────────┤

│Modem......................................│DMA3

│

├───────────────────────────────────────────┼────────────────────┤

│Secondary

DMA controller cascade...........│DMA4 (unavailable)

│

├───────────────────────────────────────────┼────────────────────┤

│Audio

adapter (default for 16-bit PCM).....│DMA5

│

├───────────────────────────────────────────┼────────────────────┤

│Open.......................................│DMA6

│

├───────────────────────────────────────────┼────────────────────┤

│Open.......................................│DMA7

│

└───────────────────────────────────────────┴────────────────────┘

INTERRUPT ASSIGNMENTS

┌──────────────────────────────────────────────┬──────────────┬───────────┐

│DEVICE/CIRCUIT

│INTERRUPT

│STATUS

│

├──────────────────────────────────────────────┼──────────────┼───────────┤

│8254

counter timer

│IRQ0

│Reserved

│

│PS/2

keyboard

│IRQ1

│Reserved

│

│Secondary

interrupt controller cascade

│IRQ2

│Reserved

│

│Serial

port (COM2) FAX/modem default *

│IRQ3

│Unavailable│

│Serial

port (COM1)

│IRQ4

│Reserved

│

│Audio

Adapter (default interrupt)

│IRQ5

│Unavailable│

│Diskette

drive interface

│IRQ6

│Reserved

│

│Parallel

port

│IRQ7

│Reserved

│

│Real-time

clock

│IRQ8

│Reserved

│

│Video

vertical retrace

│IRQ9

│Available │

│Alternate

serial port (COM4)

│IRQ10

│Available │

│Alternate

serial port (COM3)

│IRQ11

│Available │

│PS/2

mouse interface

│IRQ12

│Reserved

│

│Coprocessor

│IRQ13

│Reserved

│

│IDE

hard drive interface

│IRQ14

│Reserved

│

│Open

│IRQ15

│Available │

├──────────────────────────────────────────────┴──────────────┴───────────┤

│(*)

The COM2 serial port is normally disabled and used by

│

│the

FAX/MODEM adapter.

│

└─────────────────────────────────────────────────────────────────────────┘

(smc-12/06/93)

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