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 Atari 850 Serial Ports

Atari 850 Serial ports

  
Type: DE9

Port R1

Pin Function/Description RS232-DB25
1 DTR - Data Terminal Ready 20
2 CRX - Signal (carrier) Detect 8
3 XMT - Transmitted Data 2
4 RCV - Received Data 3
5 GND - Signal Ground 7
6 DSR - Data Set Ready 6
7 RTS - Request to Send 4
8 CTS - Clear to Send 5
9 No connection to shield Frame to shield wire

Port R2

Pin Function
1 DTR
3 Send Data
4 Receive Data
5 Signal Ground
6 DSR

Port R3

Pin Function
1 DTR
3 Send Data
4 Receive
5 Signal Ground
7 RTS
8 8 Volts

Port R4

Pin Function
1 Send Data +
3 Send Data -
7 Receive Data +
9 Receive Data - (20 mA)

 

 

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