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Specifications 6-11
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
Writer: The Integrity Group Saved by: The Integrity Group Saved date: 10/26/00 11:53 AM
Part Number: 128679-006 File name: Ch06
Table 6-15
System DMA
Hardware DMA System Function
DMA0 Available for audio
DMA1 Entertainment Audio (default; alternate = DMA0, DMA3,
None)
DMA2 Diskette drive
DMA3 ECP parallel port LPT1 (default; alternate = DMA 0, none)
DMA4 DMA controller cascading (not available)
DMA5 Available for PC Card
DMA6 Not assigned
DMA7 Not assigned
NOTE: PC Card controller can use DMA 1, 2, or 5.
Table 6-16
System Interrupts
Hardware DMA System Function
IRQ0 System timer
IRQ1 Keyboard controller
IRQ2 Cascaded
IRQ3 COM2
IRQ4 COM1
IRQ5 Audio (default)*
IRQ6 Diskette drive
IRQ7 Parallel port
IRQ8 Real time clock (RTC)
IRQ9 Infrared
IRQ10 System use
IRQ11 System use
IRQ12 Internal point stick or external mouse
IRQ13 Coprocessor (not available to any peripheral)
IRQ14 IDE interface (hard disk and CD-ROM drive)
IRQ15 Fixed disk drives on the expansion base or convenience
base
*
Default configuration; audio possible configurations are: IRQ5, IRQ7, IRQ9, IRQ10, or none.
NOTE: PCMCIA cards may assert IRQ3, IRQ4, IRQ5, IRQ7, IRQ9, IRQ10, IRQ11, or IRQ15.
Either the infrared or the serial port may assert IRQ3 or IRQ4.