Pinout for ACPA Expansion Bus

Pin

Signal

Definition

 

 

 

Pin

Signal

Definition

1

CLKIN

Input INT OSC [40MHz]

I

 

 

31

+12 Vdc

??? (via 10 Ω R)

2

-RS

Reset input

I

 

I

32

READY

Data ready input

3

N/C

 

 

 

I

33

-INT2/0

External user interrupt input

4

Vss

Ground

I

 

I

34

Vss

Ground

5

Vcc

+5V dc

I

 

I

35

-HOLD

Hold input [idle mode]

6

CLKX

CLK serial port xmit output

I

 

I

36

CLKR

CLK for serial port recv input

7

D15

Data bus D15 [M] [MSB]

I/O/Z

 

I/O/Z

37

D14

Data bus D14 [M]

8

D13

Data bus D13 [M]

I/O/Z

 

I/O/Z

38

D12

Data bus D12 [M]

9

D11

Data bus D11 [M]

I/O/Z

 

I/O/Z

39

D10

Data bus D10 [M]

10

D9

Data bus D9 [M]

I/O/Z

 

I/O/Z

40

D8

Data bus D8 [M]

11

D7

Data bus D7 [M]

I/O/Z

 

I/O/Z

41

D6

Data bus D6 [M]

12

D5

Data bus D5 [M]

I/O/Z

 

I/O/Z

42

D4

Data bus D4 [M]

13

D3

Data bus D3 [M]

I/O/Z

 

I/O/Z

43

D2

Data bus D2 [M]

14

D1

Data bus D1 [M]

I/O/Z

 

I/O/Z

44

D0

Data bus D0 [M] [LSB]

15

DR

Serial data receive input

I

 

O/Z

45

DX

Serial data transmit output

16

Vss

Ground

I

 

O

46

-HOLDA

Hold acknowledge signal

17

Vcc

+5 Vdc

I

 

I

47

Vss

Ground

18

-STRB

Strobe signal

O/Z

 

I/O/Z

48

FSX

Frame synch pulse for xmit.

19

-PS

Program select signal

O/Z

 

O/Z

49

R/-W

Read/write signal

20

-IS

I/O space select signal

O/Z

 

I

50

FSR

Frame synch pulse for recv input

21

A0

Address bus A0 [LSB]

O/Z

 

O/Z

51

-DS

Data select signal

22

A2

Address bus A2

O/Z

 

O/Z

52

A1

Address bus A1

23

A4

Address bus A4

O/Z

 

O/Z

53

A3

Address bus A3

24

A6

Address bus A6

O/Z

 

O/Z

54

A5

Address bus A5

25

A8

Address bus A8

O/Z

 

O/Z

55

A7

Address bus A7

26

A10

Address bus A10

O/Z

 

O/Z

56

A9

Address bus A9

27

A12

Address bus A12

O/Z

 

O/Z

57

A11

Address bus A11

28

A14

Address bus A14

O/Z

 

O/Z

58

A13

Address bus A13

29

Vcc

+5 Vdc

I

 

O/Z

59

A15

Address bus A15 [MSB]

30

Vss

Ground

I

 

I

60

Vss

Ground

 

NOTES:

All Data Bus and Address Bus lines are 16-bit.

All Data Bus Lines are Multiplexed between program, data, and I/O spaces

PS, DS, IS select the Program, data, and I/O space used by Data Bus and Address Bus

I/O/Z denotes input/output/high-impedance state.