Appendix D - Dma, Irq And 1; St Mb Memory; Dma Channel Assignments; Irq Mapping Chart - Xycom 4115T User Manual

Appendix D – DMA, IRQ and 1

DMA Channel Assignments

IRQ Mapping Chart

IRQ0
IRQ1
IRQ2
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
All IRQs have been assigned to the listed devices, so if you want to add any
additional device interface, you must free the unused IRQ first. For example, if you
don't use USB K/B or Mouse, then IRQ10 may be set free.
Table C–1. DMA Channel Assignments
Channel Description
0 Available
1 Available
2 Floppy Disk (8-bit transfer)
3 Available
4 Cascade for DMA controller 1
5 Sound
6 Available
7 Available
Table C–2. IRQ Mapping
System Timer IRQ8
Keyboard IRQ9
IRQ Controller IRQ10
(COM2) IRQ11
(COM1) IRQ12
Intel ICH4 LAN IRQ13
FDC IRQ14
LPT1 IRQ15
61
st
MB Memory
RTC Clock
AC97 Audio
IRQ Holder for PCI steering
ICH4 USB2.0
PS/2 Mouse
FPU
Primary IDE
Secondary IDE
Note
143926(A)