myoldmac.net - FAQ - Macintosh Plus Pinouts

Apple System Peripheral-8 Cable
(connects Macintosh Plus to ImageWriter II and Apple Personal Modem)

Female	Male
1	2
2	1
3	5
4	4
5	3
6	8
7	7
8	6

Macintosh Plus Adapter Cable
(connects Macintosh Plus DIN-8 to existing Macintosh DB-9 cables)

Mouse pinouts
Information from Apple Tech Notes

(At the computer)
(At the mouse cable)

9 PIN D-SUB FEMALE at the computer.
9 PIN D-SUB MALE at the mouse cable.

Pin	Name	Dir	Description
1	CGND	---	Chassis ground
2	+5V	-->	+5 VDC
3	CGND	---	Chassis ground
4	X2	<--	Horizontal movement line (connected to VIA PB4 line)
5	X1	<--	Horizontal movement line (connected to SCC DCDA-line)
6	n/c	-	Not connected
7	SW-	<--	Mouse button line (connected to VIA PB3)
8	Y2	<--	Vertical movement line (connected to VIA PB5 line)
9	Y1	<--	Vertical movement line (connected to SCC DCDB-line)

Note: Direction is Computer relative Mouse.
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Keyboard cable - Information from Emilio Rossi' Hardware Book

RJ11 FEMALE CONNECTOR at the Computer.
RJ11 MALE CONNECTOR at the Keyboard.

Pin	Name	Dir	Description
1	CGND	---	Chassis ground
2	KBD1	?	Keyboard clock
3	KBD2	?	Keyboard data
4	+5V	-->	+5 VDC

Note: Direction is Computer relative Keyboard.

External floppy drive cable

19 PIN D-SUB FEMALE at the Computer.
19 PIN D-SUB MALE at the Diskdrive.

Pin Name Dir Description

1 CGND
---
Chassis ground

2 CGND
---
Chassis ground

3 CGND
---
Chassis ground

4 CGND
---
Chassis ground

5 -12V
-->
-12 VDC

6 +5V
-->
+5 VDC

7 +12V
-->
+12 VDC

8 +12V
-->
+12 VDC

9 n/c
-
Not connected

10 PWM
?
Regulates speed of the drive

11 CA0
?
Control line to send commands to the drive

12 CA1
?
Control line to send commands to the drive

13 CA2
?
Control line to send commands to the drive

14 LSTRB
?
Control line to send commands to the drive

15 WrReq-
?
Turns on the ability to write data to the drive

16 HdSel
?
Control line to send commands to the drive

17 Enbl2-
?
Enables the Rd line (else Rd is tristated)

18 Rd
<--
Data actually read from the drive

19 Wr
-->
Data actually written to the drive

Note: Direction is Computer relative Diskdrive.
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Macintosh Video to VGA (no Macintosh Plus Pinout)

Use this adapter to connect a standard VGA (or higher) monitor to your Apple Macintosh.

15 PIN D-SUB MALE (to the Computer)
15 PIN HIGHDENSITY D-SUB FEMALE (to the Monitor-cable)

15 PIN D-SUB MALE to the Computer.
15 PIN HIGHDENSITY D-SUB FEMALE to the Monitor-cable.

Description	Mac	VGA
Red Ground	1	6
Red	2	1
Composite sync	3	13
Monitor Sense 0	4	4
Green	5	2
Green Ground	6	7
Monitor Sense 1	7	11
No connection	8	n/c
Blue	9	3
Monitor sense 2	10	12
Sync Ground	11	10
Vertical Sync	12	14
Blue Ground	13	8
Horizontal Sync Ground	14	n/c
Horizontal Sync	15	n/c

Macintosh Pinouts