American Megatrends Enterprise-II User Manual page 13

Description,
Continued
Seven DMA Channels
The Enterprise-II has seven DMA channels.
In accordance with the EISA
specifications, any DMA channel may be
programmed for 8, 16, or 32-bit DMA device
size and ISA compatible, type A, type B,
or burst type C modes.
Fifteen Interrupt Levels
The Enterprise-II has 15 hardware
interrupt levels. Of course, NMIs take
precedence over the following hardware
interrupts.
Priority Label
1 IRQ 0
2 IRQ 1
3-10 IRQ 2
3 IRQ 8
4 IRQ 9
5 IRQ 10
6 IRQ 11
7 IRQ 12
8 IRQ 13
9 IRQ 14
10 IRQ 15
11 IRQ 3
12 IRQ 4
13 IRQ 5
14 IRQ 6
15 IRQ 7
American Megatrends Enterprise-II Motherboard User's Guide
Typical Interrupt Source
Interval Timer 1, Counter 0 OUT
Keyboard
Used internally for IRQ 8 through IRQ 15
Real-TIme-Clock
EISA bus
EISA bus
EISA bus
Mouse on EISA bus
Coprocessor Error
EISA bus (Hard disk drive controller)
EISA bus
EISA bus (Serial Port 2)
EISA bus (Serial Port 1)
EISA bus (Parallel Port 2)
EISA bus and floppy disk controller
EISA bus (Parallel Port 1)
5