mhorne@tekfdi.TEK.COM (Michael T. Horne) (09/05/87)
HELP!!! I need pinouts for the RS-232 port (modem port) on a Mac Plus. I have no source for the pinout of the "round-8" connector on the back, and need it so I can make some special cables. Please reply directly to one of the address below. Thanks a bunch in advance! Mike -- Michael Horne - KA7AXD | DOMAIN: mhorne@honda.fdi.tek.com FDI group, Tektronix, Inc | UUCP: tektronix!tekfdi!honda!mhorne Day: (503) 627-1666 | INTERNET: mhorne%honda.fdi.tek.com@relay.cs.net
psych@watdcsu.waterloo.edu (R.Crispin - Psychology) (09/06/87)
There have been a number of requests lately for the pinouts for the
Mac. Below is a text version of technote 10. It is in text format
since a number of people don't have binhex.
Richard Crispin
Dept. of Psychology
Univ. of Waterloo
Waterloo, Ont.
N2L 3G1
(519)885-1211 ext. 2879
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______________________________________________________________________
Macintosh Technical Notes p
#10: Pinouts
See also: Macintosh Hardware Manual
Modified: July 23, 1985
____________________________________________________________________
This note gives pinout descriptions for the Macintosh ports, Macintosh
cables, and various other products.
_____________________________________________________________________
Below are pinout descriptions for the Macintosh ports, cables, and various other
products. Please refer to the Macintosh Hardware chapter for more information,
especially about power limits (the Macintosh Hardware chapter is included in the May
Software Supplement). Note that any unconnected pins are omitted.
Macintosh Port Pinouts
Macintosh Serial Connectors (DB-9)
Pin Name Description/Notes
1 Ground
2 +5V See Macintosh Hardware chapter for power limits
3 Ground
4 TxD+ Transmit Data line
5 TxD- Transmit Data line
6 +12V See Macintosh Hardware chapter for power limits
7 HSK HandShaKe: CTS or TRxC, depends on Zilog 8530 mode
8 RxD+ Receive Data line; ground this line to emulate RS232
9 RxD- Receive Data line
Macintosh Mouse Connector (DB-9)
Pin Name Description/Notes
1 Ground
2 +5V See Macintosh Hardware chapter for power limits
3 GND Ground
4 X2 Horizontal movement line (connected to VIA PB4 line)
5 X1 Horizontal movement line (connected to SCC DCDA- line)
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)
Macintosh Keyboard Connector (RJ-11 Telephone-style jack)
Pin Name Description/Notes
1 Ground
2 KBD1 Keyboard clock
3 KBD2 Keyboard data
4 +5V See Macintosh Hardware chapter for power limits
Macintosh External Drive Connector (DB-19)
Pin Name Description/Notes
1 Ground
2 Ground
3 Ground
4 Ground
5 -12V See Macintosh Hardware chapter for power limits
6 +5V See Macintosh Hardware chapter for power limits
7 +12V See Macintosh Hardware chapter for power limits
8 +12V See Macintosh Hardware chapter for power limits
10 PWM Regulates speed of the drive
11 PH0 Control line to send commands to the drive
12 PH1 Control line to send commands to the drive
13 PH2 Control line to send commands to the drive
14 PH3 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 tri-stated)
18 Rd Data actually read from the drive
19 Wr Data actually written to the drive
Other Pinouts
Macintosh XL Serial Connector A (DB-25)
Pin Name Description/Notes
1 Ground
2 TxD Transmit Data line
3 RxD Receive Data line
4 RTS Request to Send
5 CTS Clear To Send
6 DSR Data Set Ready
7 Ground
8 DCD Data Carrier Detect
15 TxC Connected to TRxCA
17 RxC Connected to RTxCA
24 TEXT Connected to TRxCA
Macintosh XL Serial Connector B (DB-25)
Pin Name Description/Notes
1 Ground
2 TxD- Transmit Data line
3 RxD- Receive Data line
6 HSK/DSR TRxCB or CTSB
7 Ground
19 RxD+ Receive Data line
20 TXD+/DTR connected to DTRB
Apple 300/1200 Modem Serial Connector (DB-9)
Modem Name Description/Notes
2 DSR Output from modem
3 Ground
5 RxD Output from modem
6 DTR Input to modem
7 DCD Output from modem
8 Ground
9 TxD Input to modem
Apple Imagewriter Serial Connector (DB-25)
ImageWriter Name Description/Notes
1 Ground
2 SD Send Data; Output from Imagewriter
3 RD Receive Data; Input to Imagewriter
4 RTS Output from Imagewriter
7 Ground
14 FAULT- False when deselected; Output from Imagewriter
20 DTR Output from Imagewriter
Apple LaserWriter AppleTalk Connector (DB-9)
LaserWriter Name Description/Notes
1 Ground
3 Ground
4 TxD+ Transmit Data line
5 TxD- Transmit Data line
7 RXCLK TRxC of Zilog 8530
8 RxD+ Receive Data line
9 RxD- Receive Data line
Apple LaserWriter Serial Connector (DB-25)
LaserWriter Name Description/Notes
1 Ground
2 TXD- Transmit Data; Output from LaserWriter
3 RXD- Receive Data; Input to LaserWriter
4 RTS- Output from LaserWriter
5 CTS Input to LaserWriter
6 DSR Input to LaserWriter (connected to DCBB- of 8530)
7 Ground
8 DCD Input to LaserWriter (connected to DCBA- of 8530)
20 DTR- Output from LaserWriter
22 RING Input to LaserWriter
Macintosh Cable Pinouts
Note for the cable descriptions below:
1. The arrows ("--->") show which side is an input and which is an output. For example,
the notation "a ---> b" means that signal "a" is an output and "b" is an input.
2. When pins are said to be connected on a side in the Notes column, it means the pins
are connected on that side of the connector.
Macintosh Imagewriter Cable
(part number 590-0169)
Macintosh Name Imagewriter Notes
(DB9) (DB25)
1 Ground 1
3 Ground 7 pins 3, 8 connected on Macintosh side
5 TxD- ---> RD 3 RD = Receive Data
7 HSK <--- DTR 20
8 RxD+ = GND Not connected on Imagewriter side
9 RxD- <--- SD 2 SD = Send Data
Macintosh Modem Cable (Warning! Don't use this cable to connect 2 Macintoshes!)
(part number 590-0197-A)
Macintosh Name Modem Notes
(DB9) (DB9)
3 Ground 3 pins 3, 8 connected on EACH side
5 TxD- ---> TxD 9
6 +12V ---> DTR 6
7 HSK <--- DCD 7
8 No wire 8
9 RxD- <--- RxD 5
Macintosh to Macintosh Cable (Macintosh Modem Cable with pin 6 clipped on both ends.)
Macintosh Name Macintosh Notes
(DB9) (DB9)
3 Ground 3 pins 3, 8 connected on EACH side
5 TxD- ---> RxD- 9
7 HSK <--- DCD 7
8 No wire 8
9 RxD- <--- TxD- 5
Macintosh External Drive Cable
(part number 590-0183-B)
Macintosh Name Sony Drive
(DB9) (20 Pin Ribbon)
1 Ground 1
2 Ground 3
3 Ground 5
4 Ground 7
6 +5V 11
7 +12V 13
8 +12V 15
10 PWM 20
11 PH0 2
12 PH1 4
13 PH2 6
14 PH3 8
15 WrReq- 10
16 HdSel 12
17 Enbl2- 14
18 Rd 16
19 Wr 18
Macintosh XL Null Modem Cable
(part number 590-0166-A)
Macintosh XL Name DTE Notes
(DB25) (DB25)
1 Ground 1
2 TxD- ---> RxD 3
3 RxD- <--- TxD 2
4,5 RTS,CTS ---> DCD 8 pins 4,5 connected together
6 DSR <--- DTR 20
7 Ground 7
8 DCD <--- RTS,CTS 4,5 pins 4,5 connected together
20 DTR ---> DSR 6
Macintosh to Non-Apple product Cable Pinouts
Macintosh to IBM PC Serial Cable #1 (not tested)
Macintosh Name IBM PC Notes
(DB9) (DB25)
3 Ground 7 pins 3, 8 connected on Macintosh side
5 TxD- ---> RxD 3
7 HSK <--- DTR 20
8 RxD+ = Ground Not connected on IBM side
9 RxD- <--- TxD 2
CTS <--- RTS 4-5 pins 4,5 connected on IBM side
DSR <--- DCD,DTR 6-8-20 pins 6,8,20 connected on IBM side
Macintosh to IBM PC Serial Cable #2 (not tested)
Macintosh Name IBM PC Notes
(DB9) (DB25)
1 Ground 1
3 Ground 7 pins 3, 8 connected on Macintosh side
5 TxD- ---> RxD 3
9 RxD- <--- TxD 2
CTS <--- RTS 4-5 pins 4, 5 connected on IBM side
DSR <--- DTR 6-8 pins 6, 8 connected on IBM side