Product Reference

Table 2–51. DMA Channel Assignments

Channel

Function

 

 

0

Available for 8-bit transfers

1

Available for 8-bit transfers

 

(Multimode Parallel port)

2

Floppy controller

3

Available for 8-bit transfers

 

 

4

Cascade for channels 0-3

5

Available for 16-bit transfers

6

Available for 16-bit transfers

7

Available for 16-bit transfers

 

 

Table 2–52 summarizes the available interrupt assignments for all subsystems on the

Little Board/486e CPU. Use the table to plan which interrupts to use in your system. Factory defaults are shown in gray.

Function

Table 2–52. Summary of IRQ Options

IRQ

3

4

5

6

7

9

10

11

12

14

15

 

 

 

 

 

 

 

 

 

 

 

Serial 1

 

"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Serial 2

"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Serial 3

 

 

 

 

"

 

 

"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Serial 4

 

 

"

 

 

 

"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Parallel

 

 

"

 

"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Floppy

 

 

 

"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IDE

 

 

 

 

 

 

 

 

 

"

 

 

 

 

 

 

 

 

 

 

 

 

 

Ethernet

"

 

 

 

 

"

"

"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Video

 

 

 

 

(None)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2–71

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Image 87
Ampro Corporation 486E manual Channel Function, Serial Parallel Floppy, Ethernet Video