Ps/2 Mouse; Specifications - American Megatrends Enterprise-IV User Manual

Specifications,

Seven DMA Channels
The Enterprise-IV 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-IV has 15 hardware interrupt levels. Of course, NMIs take precedence over the following
hardware interrupts.
Onboard I/O
The Enterprise-IV has an onboard IDE controller, floppy controller, two serial ports with National
Semiconductor 16450 UARTs, and a parallel port.
Chapter 2 Description
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Continued
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
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

PS/2 Mouse

Coprocessor Error
EISA bus (Hard disk drive controller)
EISA bus
Onboard serial port or EISA bus
Onboard serial port or EISA bus
Onboard parallel port or EISA bus
Onboard floppy controller or EISA bus
Onboard parallel port or EISA bus