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Ports and Pinouts
Ports and Pinouts Cable Connectors - 1
Cable Connectors
The pin numbers shown are for the connectors attached to the ends of the Macintosh
peripheral cables, as viewed from the front of the connector.
152 77
Processor-Direct Slot, 152-Pin
76 HDI-30 1
HDI-20
PowerBook Video
14 2 30 25
20 16
6 1 5 1
13 1
HDI-45-pin Mini DIN-4
Apple Desktop Bus
Apple AAUI 45 44 43 37 36 35
(Ethernet)
3 4
28
1 7 34
27 19
18
12
3 2 1
8 14 11 10 9 3 2 1
S-Video Mini Din-7 Serial Mini Din-8 GeoPort Mini Din-9
7 7 7
4 3 6 8 8 6
IN 3 5
2 1 5 3
9 4
6 5
1 2
2 1
Mini DIN-4 S-Video
4
DB-15
1 8
3
4
2 1
9 15
DB-25 Composite Video (RCA jack)
IN/OUT
1 13
Sig Gnd RF Input
14 25
1 25
BR-50
26 50 Microphone Jack
Ports and Pinouts GeoPort Mini DIN-9 - 2
GeoPort Mini DIN-9
The back panel of all Power Macintosh models contain two
I/O ports for serial telecommunication data. Both sockets
accept 9-pin plugs, allowing either port to be independently
programmed for asynchronous or synchronous
communication formats up to 9600 bps. This includes
AppleTalk and the full range of Apple GeoPort protocols.
Pin Name Function
1 SCLK (out) Reset pod or get pod attention
2 Sync (in)/SCLK (in) Serial clock from pod (up to 920 Kbit/sec.)
3 TxD- Transmit -
4 Gnd/shield Ground
5 RxD- Receive -
6 TxD+ Transmit +
7 Wake up/TxHS Wake up CPU or do DMA handshake
8 RxD+ Receive +
9 +5V Power to pod (350 mA maximum)
Ports and Pinouts Apple Desktop Bus (ADB) Connector - 3
Apple Desktop Bus (ADB) Connector
Connector type: Mini DIN-4 male.
The total length of all cables should not exceed 16 feet (5
meters).
Pin Signal Name Signal Description
1 Data Bidirectional data bus
2a Power On/ Signal momentarily grounded to pin 4 to begin
startup sequence in CPU
3 Power +5 volts
4 Ground Signal ground
a. On the Macintosh II family, Quadra 700 and 900, and PowerBook series only.
Pin 2 is unused on all other models.
Ports and Pinouts Mouse Connector - 4
Mouse Connector
Connector type: DE-9.
This connector is present on the Macintosh 128K, 512K,
512K enhanced, and Macintosh Plus.
Pin Signal Name Signal Description
1 GND Signal ground
2 +5V +5 volts DC
3 GND Signal ground
4 X2 Left-to-right motion indicator
5 X1 Interrupt line (left-to-right motion)
6 NC No connection
7 SW Mouse button
8 Y2 Up-down motion indicator
9 Y1 Interrupt line (up-down motion)
Ports and Pinouts Keyboard Connector - 5
Keyboard Connector
Connector type: RJ-11.
This connector is present on the Macintosh 128K, 512K,
512K enhanced, and Macintosh Plus.
Pin Signal Name Signal Description
1 GND Ground
2 CLOCK Keyboard clock (input to VIA)
3 DATA Serial data line
4 +5V +5 volts
Ports and Pinouts Modem and Printer Ports - 6
Modem and Printer Ports
Connector type: DE-9.
This connector is present on Macintosh 128K, 512K, and
512K enhanced.
Upper set of signal names and descriptions applies to RS-
422. Lower set applies to RS-232.
Pin Signal Name Signal Description
1 GND Signal ground
FG Frame ground
2 +5V +5 volts
NC No connection
3 GND Signal ground
SG Signal ground
4 TXD+ Transmit Data +
NC No connection
5 TXD- Transmit Data -
TXD Transmit Data
6 +12V +12 volts
NC No connection
7a HSKi Handshake input
NC No connection
8b RXD+ Receive Data +
NC No connection
9 RXD- Receive Data -
RXD Receive Data
a. When connecting to an RS-232 device,
use HSKi with data set ready (DSR) or
other handshaking signals, depending on
the device to be connected.
b.When connecting to an RS-232 device,
connect pin 8 to pin 3 (ground).
Ports and Pinouts Modem and Printer Ports - 7
Connector type: Mini-DIN 8.
This connector is not present on Macintosh 128K, 512K,
and 512K enhanced computers.
To connect DE-9 cables to the Mini DIN-8 port, use adapter
cable 590-0341 (beige) or 590-0553/699-0430
(smoke)..
Pin Signal Name Signal Description
1 HSKo Handshake out
2 HSKi Handshake in/external clock
3 TxD- Transmit data -
4 GND Signal ground
5 RxD- Receive data -
6 TxD+ Transmit data +
7a NC General-purpose input
8 RxD+ Receive data +
a. On serial port A (modem), if the VIA1 SYNC signal
is high, this input will be routed to the receive/transmit
clock input of the SCC. This clock input supports
high-speed synchronous devices. Pin 7 is not connect-
ed on the Macintosh Plus, LC, or IIsi.
Ports and Pinouts RCA Jack Pinout - 8
RCA Jack Pinout
Pin Input Connector Output Connector
1 AGND AGND
2 AGND AGND
3 Video Y (luminance) Video Y (luminance)
4 Video C (chroma) Video C (chroma)
5 I^2C clock (I-squared)a Composite Video
6 +12V at 250 mA maximumb No connection
7 I^2C dataa No connection
a. Phillips serial bus
b. Fused at 1.1A
Ports and Pinouts HDI-45 - 9
HDI-45
Connector type: 45-pin high-density interconnect (HDI-
45).
The Power Macintosh computers provide connection to
AudioVision monitors (and other monitors when used with an
adapter cable) by means of an AudioVision HDI-45 monitor
socket on their back panels.
Pin Description Pin Description
1 Analog audio ground 24 Reserved
2 Audio input shield 25 Reserved
3 Left channel audio input 26 Red ground (shield)
4 Right channel audio input 27 Red video output (75 ohms)
5 Left channel audio output 28 I^2C data signala(I-squared)
6 Right channel audio output 29 I^2C clock signala (I-squared)
7 Reserved 30 Reserved
8 Monitor ID sense line 1 31 Monitor ID
9 Monitor ID sense line 2 32 Monitor ID
10 Green ground (shield) 33 Vertical sync signal
11 Green video output (75 ohms) 34 Composite sync signal
12 Video input power ground 35 ADB power +5V
13 Power for camera +5V 36 ADB ground
14 Reserved 37 ADB data
15 Reserved 38 Keyboard switch
16 Reserved 39 Reserved
17 Reserved 40 Reserved
18 Monitor ID sense line 3 41 Monitor ID
19 S-video input shield 42 Horizontal sync signal
20 S-video input luminance (Y) 43 Video sync ground
21 S-video input chroma (C) 44 Blue ground (shield)
22 Reserved 45 Blue video output (75 ohms)
23 Reserved
a. Phillips serial bus interface.
Ports and Pinouts Ethernet: AAUI Connector Pinouts - 10
Ethernet: AAUI Connector Pinouts
The Apple Attachment Unit Interface (AAUI) connector is a
14-position, 0.050-inch-spaced ribbon contact connector.
AAUI signals have the same description, function, and
electrical requirements as the AUI signals of the same name,
as detailed in the IEEE Standard 802.3-1990 CSMA/CD,
section 7.
Pin Signal Name Signal Description
1 FN Pwr Power (+12V @ 2.1W or +5V @ 1.9W)
2 DI-A Data in circuit A
3 DI-B Data in circuit B
4 VCC Voltage Common
5 CI-A Control in circuit A
6 CI-B Control in circuit B
7 +5V +5 volts (from host)
8 +5V Secondary +5 volts (from host)
9 DO-A Data Out circuit A
10 DO-B Data Out circuit B
11 VCC Secondary Voltage Common
12 NC Reserved
13 NC Reserved
14 FN Pwr Secondary +12V @ 2.1W or +5V @
1.9W
Shell Protective Gnd Protective Ground
Ports and Pinouts Audio Output Connector: Stereo - 11
Audio Output Connector: Stereo
Connector type: Stereo miniature phone plug (3.6 mm).
The internal speaker is disabled when this connector is in
use.
Pin Signal Name Signal Description
(Sleeve) GND Signal ground
(Tip) Left 1-volt a, peak-to-peak audio signal with an
impedance of 47 ohms, left channel
(Ring) Right 1-volt a, peak-to-peak audio signal with an
impedance of 47 ohms, right channel
a. The PowerBook series produce a 0.75-volt, peak-to-peak signal.
Ports and Pinouts Audio Output Connector: Monaural - 12
Audio Output Connector: Monaural
Connector type: Monaural miniature phone plug (3.6 mm).
The internal speaker is disabled when this connector is in
use.
Pin Signal Name Signal Description
(Sleeve) GND Signal ground
(Tip) AUDIO .5-volt, peak-to-peak audio signal
Ports and Pinouts Microphone Input Connector - 13
Microphone Input Connector
Connector type: Stereo miniature phone plug (3.6 mm).
Caution: Do not connect any device other than the Macintosh
microphone into the microphone input connector. The
connector provides +8 volts for the microphone. Connecting
incompatible devices could damage the device or computer.
Pin Signal Name Signal Description
(Sleeve) GND Signal ground
(Tip) +8V +8 volts for powering electret microphone
(Ring) Right Audio input with a maximum amplitude of
20 mV at 600 ohms impedance
Ports and Pinouts Line Input Connectors - 14
Line Input Connectors
Connector type: RCA phono plug.
This connector is present on the Macintosh Quadra 900/
950. Two connectors are provided--right and left channel.
The stereo information will be internally mixed to yield a
monaural signal.
Pin Signal Description
(Sleeve) Digital ground
(Tip) Audio input
Ports and Pinouts HDI-30 and BR-50 SCSI Disk Adapter Cable - 15
HDI-30 and BR-50 SCSI Disk Adapter
Cable
These connectors are found on the SCSI Disk Adapter cable.
The pin numbers not mentioned are reserved.
HDI-30 BR-50 Signal Name Signal Description
2 26 /DB0 SCSI data bit 0
1,3 19 GND Ground, Pin 1 enables SCSI disk mode
4 27 /DB1 SCSI data bit 1
5 38 TERMPWR Termination Power (not supplied by
PowerBook 100)
6 28 /DB2 SCSI data bit 2
7 29 /DB3 SCSI data bit 3
8 1,4 GND Ground
9 44 /ACK SCSI acknowledge
10 5 GND Ground
11 30 /DB4 SCSI data bit 4
12 2,3,8 GND Ground
13 11,9,6 GND Ground
14 31 /DB5 SCSI data bit 5
15 24 GND Ground
16 32 /DB6 SCSI data bit 6
17 7 GND Ground
18 33 /DB7 SCSI data bit 7
19 34 /DBP SCSI data bit parity
20 23, 16, 20 GND Ground
21 49 /REQ SCSI request
22 21, 22 GND Ground
23 43 /BSY SCSI busy
24 25 GND Ground
25 41 /ATN SCSI attention
26 48 /C/D SCSI control/data
27 45 /RST SCSI bus reset
Ports and Pinouts HDI-30 and BR-50 SCSI Disk Adapter Cable - 16
HDI-30 BR-50 Signal Name Signal Description
28 46 /MSG SCSI message
29 47 /SEL SCSI select
30 50 /I/O SCSI input/output
Ports and Pinouts External Video Connector: 15-Pin - 17
External Video Connector: 15-Pin
Connector type: DA-15 male.
This connector is present on the Macintosh LC, LC II/
Performa 400, IIci, IIsi, Quadra 700, Quadra 900/950,
Macintosh Duo Dock, and Duo MiniDock.
Pin Signal Name Signal Description
1 RED.GND Red video ground
2 RED.VID Red video
3 CSYNC/ Composite sync
4 MON.ID1 Monitor ID, bit 1
5 GRN.VID Green video
6 GRN.GND Green video ground
7 MON.ID2 Monitor ID, bit 2
8 NC No connection
9 BLU.VID Blue video
10 MON.ID3 Monitor ID, bit 3
11 C&VSYNC GND Composite & vertical sync ground
12 VSYNC/ Vertical sync
13 BLU.GND Blue video ground
14 HSYNC.GND Horizontal sync ground
15 HSYNC/ Horizontal sync
Shell CHASSIS GND Chassis ground
Ports and Pinouts External Video Connector: Macintosh Portable - 18
External Video Connector: Macintosh
Portable
Connector type: 15-pin, high-density, D-shaped male.
Pin Signal Name Signal Description
1 FPDATA(0) Flat-panel display data bus (bit 0)
2 FPDATA(1) Flat-panel display data bus (bit 1)
3 +5V +5 volts DC
4 FPDATA (2) Flat-panel display data bus (bit 2)
5 FPDATA(3) Flat-panel display data bus (bit 3)
6 FPDATA(4) Flat-panel display data bus (bit 4)
7 GND Ground
8 +5V +5 volts DC
9 GND Ground
10 FPDATA(5) Flat-panel display data bus (bit 5)
11 FPDATA(6) Flat-panel display data bus (bit 6)
12 FPDATA(7) Flat-panel display data bus (bit 7)
13 BATTVOLTAGE Direct connect to main battery
14 FLM Flat-panel new frame sync
15 CL2/ Flat-panel display data clock
Ports and Pinouts External Video Connector: 14-Pin - 19
External Video Connector: 14-Pin
Connector type: 14-pin, high-density female.
All Apple-manufactured Macintosh monitors except the 21-
inch Color Display and Two-Page Monochrome Monitor are
supported.
Pin Signal Name Signal Description
1 RED.VID Red video
2 RED.GND Red video ground
3 MON.ID1 Monitor ID, bit 1
4 VSYNC/ Vertical sync
5 CSYNC/ Composite sync
6 C&VSYNC.GND Composite and vertical sync ground
7 GRN.GND Green video ground
8 GRN.VID Green video
9 MON.ID2 Monitor ID, bit 2
10 HSYNC.GND Horizontal sync ground
11 MON.ID3 Monitor ID, bit 3
12 HSYNC/ Horizontal sync
13 BLU.VID Blue video
14 BLU GND Blue video ground
Shell CHASSIS GND Chassis ground
Ports and Pinouts SCSI Connector: DB-25 - 20
SCSI Connector: DB-25
Total length of all SCSI cables should not exceed 20 feet
(6 meters).
Caution: This interface uses the same type of connector as a
standard RS-232 serial interface but is electrically very
different. Do not connect RS-232 devices or cables to this port.
Doing so can damage the device and the computer.
Pin Signal Name Signal Description Pin Signal Name Signal Description
1 REQ/ Request 14 GND Signal ground
2 MSG/ Message 15 C/D/ Control/data
3 I/O/ input/output 16 GND Signal ground
4 RST/ Reset 17 ATN/ Attention
5 ACK/ Acknowledge 18 GND Signal ground
6 BUSY/ Busy 19 SEL/ Select
7 GROUND Signal ground 20 PARITY/ Data parity
8 Data0/ Data bit 0 21 Data1/ Data bit 1
9 GND Signal ground 22 Data2/ Data bit 2
10 Data3/ Data bit 3 23 Data4/ Data bit 4
11 Data5/ Data bit 5 24 GND Signal ground
12 Data6/ Data bit 6 25 TERMPWR +5 volts terminator power
13 Data7/ Data bit 7
Ports and Pinouts SCSI Connector: HDI-30 - 21
SCSI Connector: HDI-30
Connector type: 30-pin high-density interconnect (HDI-
30).
This connector is present on the Macintosh PowerBook
series (except the Duo 210/230).
Pin Signal Name Description Pin Signal Name Description
1 SCSI-Mode/ SCSI disk 16 Data6/ Data bit 6
mode enable
signal
2 Data0/ Data bit 0 17 GND Signal ground
3 GND Signal ground 18 Data7/ Data bit 7
4 Data1/ Data bit 1 19 PARITY/ Data parity
5 Termpwr +5 volts 20 GND Signal ground
termination
power
6 Data2/ Data bit 2 21 REQ/ Request
7 Data3/ Data bit 3 22 GND Signal ground
8 GND Signal ground 23 BUSY/ Busy
9 ACK/ Acknowledge 24 GND Signal ground
10 GND Signal ground 25 ATN/ Attention
11 Data4/ Data bit 4 26 C/D/ Control/data
12 GND Signal ground 27 RST/ Reset
13 GND Signal ground 28 MSG/ Message
14 Data5/ Data bit 5 29 SEL/ Select
15 GND Signal ground 30 I/O/ Input/output
Ports and Pinouts External Floppy Drive Connector: DB-19 - 22
External Floppy Drive Connector:
DB-19
Connector type: DB-19 male.
This connector is present on the Macintosh 128K, 512K,
512K enhanced, Plus, SE, SE/30, Classic, Classic II/
Performa 200, Portable, IIcx, IIci, IIsi, and IIvi/IIvx/
Performa 600.
A Macintosh 400K External Drive can be connected to the
Macintosh 128K, 512K, 512K enhanced, Plus, SE, and
Portable.
A Macintosh 800K External Drive or an Apple 3.5 Drive can
be connected to the Macintosh 512K enhanced, Plus, SE, SE/
30, Classic, Classic II/Performa 200, IIcx, IIci, IIsi,
Portable, and IIvi/IIvx/Performa 600.
Ports and Pinouts External Floppy Drive Connector: DB-19 - 23
Connect an Apple SuperDrive to a Macintosh SE (FDHD
upgrade), SE/30, Classic, Classic II, IIcx, IIci, IIsi,
Portable, and IIvi/IIvx/Performa 600.
Connect a Hand Disk 20 to a Macintosh 512K, 512K
enhanced, Plus, and SE.
Pin Signal Name Signal Description
1 GND Signal ground
2 GND Signal ground
3 GND Signal ground
4 GND Signal ground
5 -12V -12 volts DC
6 +5V -5 volts DC
7 +12V +12 volts DC
8 +12V +12 volts DC
9 NC No connection
10 PWM Motor speed control
11 PH0 Command control line
12 PH1 Command control line
13 PH2 Command control line
14 PH3 Command control line
15 WRREQ/ Write request
16 HDSEL Head select
17 ENBL2/ Read line enable
18 RD Read data
19 WR Write data
Ports and Pinouts External Floppy Drive Connector: HDI-20 - 24
External Floppy Drive Connector:
HDI-20
Connector type: 20-pin high-density interconnect (HDI-
20).
This connector is present on the Macintosh Duo MiniDock
and PowerBook Duo Floppy adapter. An HDI-20 1.4 MB
drive can be connected to this port.
Pin Signal Name Description
1 GND Signal ground
2 GND Signal ground
3 GND Signal ground
4 GND Signal ground
5 NC No connection
6 +5V +5 volts DC
7 +5V +5 volts DC
8 +5V +5 volts DC
9 +5V +5 volts DC
10 NC No connection
11 PH0 Phase 0
12 PH1 Phase 1
13 PH2 Phase 2
14 PH3 Phase 3
15 WREQ/ Write request
16 HDSEL Head select
17 ENBL2/ External drive select
18 RD Read data
19 WR Write data
20 NC No connection
Ports and Pinouts External Monitor Connector - 25
External Monitor Connector
Connector type: DB-15.
Pin Description
1 Red ground
2 Red video signal
3 Composite synchronization
4 Monitor sense 0
5 Green video signal
6 Green ground
7 Monitor sense 1
8 No connection
9 Blue video signal
10 Monitor sense 2
11 Synchronization ground
12 Vertical synchronization
13 Blue ground
14 Horizontal synchronization
15 Horizontal synchronization ground
Ports and Pinouts S-Video Input - 26
S-Video Input
The Power Macintosh AV card also contains two identical
connectors for S-video input and output, with adapter cables
for composite video devices that have RCA connectors (like
television equipment).
Pin Input Connector Output Connector
1 AGND AGND
2 AGND AGND
3 Video Y (luminance) Video Y (luminance)
4 Video C (chroma) Video C (chroma)
5 I^2C clock (I-squared)a Composite video
6 +12V at 250 mA maximumb No connection
7 I^2C dataa No Connection
a. Phillips serial bus
b. Fused at 1.1 A
Ports and Pinouts Macintosh II Display Cards - 27
Macintosh II Display Cards
Connector type: DA-15 male.
Caution: The signals on this connector are not the same as on
the DA-15 of the Apple IIc, IIGS, III, III Plus, or EtherTalk
Interface Card. Do not connect an Apple IIc, IIGS, III, III Plus, or
EtherTalk Interface Card device or cable to any Macintosh video
card.
The interface cards covered in this table include the
Macintosh II High-Resolution Video Card, Macintosh II
Extended High-Resolution Video Card, and Macintosh Display
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