Little Board™/486e Technical Manual

Table 2–48. AT Expansion Bus Connector, C0-C19 (P2)

Pin

Signal

Function

In/Out

Current

PU/PD/S *

 

Name

 

 

 

 

 

 

 

 

 

 

C0

GND

Ground

N/A

N/A

 

C1

SBHE

Bus High Enable

I/O

4 mA

 

C2

LA23

Address bit 23

I/O

12 mA

 

C3

LA22

Address bit 22

I/O

12 mA

 

C4

LA21

Address bit 21

I/O

12 mA

 

C5

LA20

Address bit 20

I/O

12 mA

 

C6

LA19

Address bit 19

I/O

12 mA

 

C7

LA18

Address bit 18

I/O

12 mA

 

C8

LA17

Address bit 17

I/O

12 mA

 

C9

MEMR*

Memory Read

I/O

4 mA

27K PU

C10

MEMW*

Memory Write

I/O

4 mA

27K PU

C11

SD8

Data Bit 8

I/O

4 mA

4.7K PU

C12

SD9

Data Bit 9

I/O

4 mA

4.7K PU

C13

SD10

Data Bit 10

I/O

4 mA

4.7K PU

C14

SD11

Data Bit 11

I/O

4 mA

4.7K PU

C15

SD12

Data Bit 12

I/O

4 mA

4.7K PU

C16

SD13

Data Bit 13

I/O

4 mA

4.7K PU

C17

SD14

Data Bit 14

I/O

4 mA

4.7K PU

C18

SD15

Data Bit 15

I/O

4 mA

4.7K PU

C19

Key

Key Pin

N/A

N/A

 

 

 

 

 

 

 

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

2–68

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Ampro Corporation 486E manual AT Expansion Bus Connector, C0-C19 P2
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