Null Modem cable wiring
Atari 850 / ICD P:R: to 9 pin PC port
Atari 850 to PC Null Modem (DB9-DB9)
Atari 850 / ICD P:R: to 25 pin PC port
Atari 850 to PC Null Modem (DB9-DB25)
Note: The original MIO interface has the same pinout as the Atari 850. The later remakes are following the standardized PC scheme.
9 pin PC port to 9 pin PC port (software handshake required)
PC Null Modem, no handshaking (DB9-DB9)
9 pin PC port to 9 pin PC port (hardware handshake)
PC Null Modem, hardware handshaking (DB9-DB9)
9 pin PC port to 25 pin PC port (software handshake required)
PC Null Modem, no handshaking (DB9-DB25)
9 pin PC port to 25 pin PC port (hardware handshake)
PC Null Modem, hardware handshaking (DB9-DB25)
25 pin PC port to 25 pin PC port (software handshake required)
PC Null Modem, no handshaking (DB25-DB25)
25 pin PC port to 25 pin PC port (hardware handshake)
PC Null Modem, hardware handshaking (DB25-DB25)
| TD (TX) ⇒ Transmitted Data (Transmit) RD (RX) ⇐ Received Data (Receive) RTS ⇒ Request To Send CTS ⇐ Clear To Send DSR ⇐ Data Set Ready DTR ⇒ Data Terminal Ready CD (DCD) ⇐ Carrier Detect (Data Carrier Detect) RI ⇐ Ring Indicator GND = common GrouND |
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