Apricot System Unit Connectors

Video Connector
Serial Port 9 pin
Serial Port 25 pin
Parallel Port
Keyboard / Mouse Port
Qi / Panther Power Connector


Video Connector

Pin Output Mono Color
1 Red No Pin Red
2 Green Mono Green
3 Blue No Pin Blue
4 Reserved No Pin No Pin
5 Digital G Self Test Self Test
6 Red Return Key Pin Red Return
7 Green Return Mono Return Green Return
8 Blue Return No Pin Blue Return
9 Plug No Pin No Pin
10 Digital G Digital G Digital G
11 Reserved No Pin Digital G
12 Reserved Digital G No Pin
13 Horizontal Sync Horizontal Sync Horizontal Sync
14 Vertical Sync Vertical Sync Vertical Sync
15 Reserved No Pin No Pin


Serial Port 9 pin

Pin Signal Name Input / Output
3 Transmit Data Output
2 Receive Data Input
7 Request To Send Output
8 Clear To Send Input
6 Data Set Ready Input
5 Ground N/A
1 Data Carrier Detect Input
4 Data Terminal Ready Output
9 Ring Indicator Input


Serial Port 25 pin

Pin Signal Name Input / Output
2 Transmit Data Output
3 Receive Data Input
4 Request To Send Output
5 Clear To Send Input
6 Data Set Ready Input
7 Ground N/A
8 Data Carrier Detect Input
20 Data Terminal Ready Output
22 Ring Indicate Input


Parallel Port

Pin Input/Output Signal Name Pin Input/Output Signal Name
1 Input/Output Strobe 10 Input Acknowledge -
2 Input/Output Data bit 0 11 Input Busy
3 Input/Output Data bit 1 12 Input PE
4 Input/Output Data bit 2 13 Input SLCT
5 Input/Output Data bit 3 14 Output Autofeed XT -
6 Input/Output Data bit 4 15 Input Error -
7 Input/Output Data bit 5 16 Output Initialise -
8 Input/Output Data bit 6 17 Output SLCT in -
9 Input/Output Data bit 7 18-25 Ground


Keyboard / Mouse Port

Pin Input / Output Signal Name
1 Input/Output Data
2 Reserved
3 Ground
4 +5V DC
5 Input/Output Clock
6 Reserved


Qi / Panther Power Connector

Pin Function Color
1 +5V Yellow
2 Ground Black
3 +12V Red
4 +5V Yellow
5 Ground Black
6 Power Good Orange
7 +5V Yellow
8 Ground Black
9 Ground Black
10 +5V Yellow
11 Ground Black
12 -12V Grey

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Louis F. Ohland, Peter H. Wendt, David L. Beem, William R. Walsh, Tatsuo Sunagawa, Tomáš Slavotínek, Jim Shorney, Tim N. Clarke, Kevin Bowling, and many others.

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Last update: 20 Jan 2024 - Changelog | About | Legal & Contact