850 Interface - Port 1 to Serial port wiring

[Xebec]

Hi folks --

 

I have an 850 Interface (actually two), but no Atari to RS232 serial cables. I do have a regular serial cable (9 pin female --> 25 pin male) and a Wifi232 device I'd like to play with.

 

I *think* I can make this work by wiring Serial port 1 of the interface to the 9 pin RS-232 cable as follows:

 

Atari 850 --> Serial Cable

 

1 (DTR) ---> 4

2 Carrier Detect ---> 1

3 Send Data ---> 3

4 Recv Data ----> 2

5 Ground ----> 5

6 Data Set Ready --> 6

7 RTS -----> 7

8 CTS ----> 8

9 (No need to wire)

 

Does this appear correct? And to verify, the 850 interface doesn't pass any voltages out on Port 1 so no matter what I do wiring-wise I won't damage the device?

 

I don't want a null modem setup of course, so that's why RTS/CTS and RX/TX aren't crossed.

 

References:

Atari 850 pinout: http://www.atarimania.com/faq-atari-400-800-xl-xe-what-is-the-atari-850-interface-module_38.html

Regular RS232: http://www.multitech.net/developer/wp-content/uploads/2012/06/DE9-SerialPort.png

[Kyle22]

I use an Atari CX-87 modem cable. The wiring should be an easy search, or you can call Best and B&C. As far as I know, both of them have them in stock.

[guus.assmann]

Hello Xebec,

 

The signals on the serial side do look ok.

RS232 is usually not damaged if connected wrong.

It just doesn't work. But will if you reconnect.

An output is mostly plus or minus 12V.

An input between 3 and 8V, mostly plus.

 

BR/

Guus