Monochrome (MDA), Hercules, Color (CGA) Adaptors
Connector type - DB-9
Pin Signal Pin Signal
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1 GND 6 Intensity
2 GND 7 Video *
3 N/C or RED 8 Horizontal Drive
4 N/C or GREEN 9 Vertical Drive
5 N/C or BLUE
* NTSC Video on some clone boards
EGA Adaptor
Connector Type - DB-9
Pin Signal Pin Signal
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1 GND 6 Secondary Green / Intensity
2 Secondary Red 7 Secondary Blue / Mono Video
3 Primary Red 8 Horizontal Drive
4 Primary Green 9 Vertical Drive
5 Primary Blue
VGA Adaptor
Connector Type - DB-15
Pin Signal Pin Signal
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1 Red Video 9 [KEY]
2 Green Video 10 Sync GND
3 Blue Video 11 Monitor ID - Bit 1
4 - Monitor ID - Bit 2 12 Monitor ID - Bit 0
5 - GND 13 Horizontal Sync
6 - Red GND 14 Vertical Sync
7 - Green GND 15 N/C (Reserved)
8 - Blue GND
Pin Signal Pin Signal
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1 *STROBE Юк Як ак бк вк гк
14 *Auto Feed
2 Data Bit 0 15 *Error
3 Data Bit 1 16 *Initialize Printer
4 Data Bit 2 17 *Select Input
5 Data Bit 3 18 GND
6 Data Bit 4 19 GND
7 Data Bit 5 20 GND
8 Data Bit 6 21 GND
9 Data Bit 7 22 GND
10 *Acknowledge 23 GND
11 Busy 24 GND
12 Paper Out 25 GND
13 Select
Centronics 36 pin Connector (Printer End)
Pin Signal Pin Signal
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1 *STROBE 19 GND
2 Data Bit 0 20 GND
3 Data Bit 1 21 GND
4 Data Bit 2 22 GND
5 Data Bit 3 23 GND
6 Data Bit 4 24 GND
7 Data Bit 5 25 GND
8 Data Bit 6 26 GND
9 Data Bit 7 27 GND
10 *Acknowledge 28 GND
11 Busy 29 GND
12 Paper Out 30 GND
13 Select 31 *Prime
14 *Auto Feed XT 32 *Error
15 {OSCXT} 33 Signal GND
16 Signal GND 34 N/C
17 Frame GND 35 N/C
18 +5v 36 N/C
SERIAL PORTS
NOTE: The IBM PC uses a DTE (Data Terminal Equipment) Connection
standard. Most Modems are DCE (Data Communication Equipment).
Pin Signal Pin Signal
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1 CD Carrier Detect 6 DSR Data Set Ready
2 RXD Receive Data 7 RTS Request to Send
3 TXD Transmit Data 8 CTS Clear to Send
4 DTR Data Term. Ready 9 RI Ring Indicator
5 GND Signal GND
DB-25 Connector
Pin Signal Pin Signal
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1 GND Ground
Vova
