Little Board™/486e Technical Manual

Table 2–46. AT Expansion Bus Connector, A1-A32 (P1)

Pin

Signal

Function

In/Out

Current

PU/PD/S *

 

Name

 

 

 

 

 

 

 

 

 

 

A1

IOCHCK*

bus NMI input

IN

N/A

 

A2

SD7

Data bit 7

I/O

4 mA

4.7K PU

A3

SD6

Data bit 6

I/O

4 mA

4.7K PU

A4

SD5

Data bit 5

I/O

4 mA

4.7K PU

A5

SD4

Data bit 4

I/O

4 mA

4.7K PU

A6

SD3

Data bit 3

I/O

4 mA

4.7K PU

A7

SD2

Data bit 2

I/O

4 mA

4.7K PU

A8

SD1

Data bit 1

I/O

4 mA

4.7K PU

A9

SD0

Data bit 0

I/O

4 mA

4.7K PU

A10

IOCHRDY

Processor Ready Ctrl

IN

N/A

1K PU

A11

AEN

Address Enable

I/O

4 mA

 

A12

SA19

Address bit 19

I/O

12 mA

 

A13

SA18

Address bit 18

I/O

12 mA

 

A14

SA17

Address bit 17

I/O

12 mA

 

A15

SA16

Address bit 16

I/O

4 mA

 

A16

SA15

Address bit 15

I/O

4 mA

 

A17

SA14

Address bit 14

I/O

4 mA

 

A18

SA13

Address bit 13

I/O

4 mA

 

A19

SA12

Address bit 12

I/O

4 mA

 

A20

SA11

Address bit 11

I/O

4 mA

 

A21

SA10

Address bit 10

I/O

4 mA

 

A22

SA9

Address bit 9

I/O

4 mA

 

A23

SA8

Address bit 8

I/O

4 mA

 

A24

SA7

Address bit 7

I/O

4 mA

 

A25

SA6

Address bit 6

I/O

4 mA

 

A26

SA5

Address bit 5

I/O

4 mA

 

A27

SA4

Address bit 4

I/O

4 mA

 

A28

SA3

Address bit 3

I/O

4 mA

 

A29

SA2

Address bit 2

I/O

4 mA

 

A30

SA1

Address bit 1

I/O

4 mA

 

A31

SA0

Address bit 0

I/O

4 mA

 

A32

GND

Ground

N/A

N/A

 

 

 

 

 

 

 

* PU = pull up; PD = pull down; S = resistance in series. All values in ohms.

2–66

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Ampro Corporation 486E manual Pin Signal Function In/Out Current, Pu/Pd/S
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