CX88 Cable Pinouts

[+DavidMil]

I promised someone a while back that I would post the pinouts for the CX88 Terminal Cable, so here they are.

Both ends of this cable have male connectors and only seven of the pins on each end are used.  They are:

On the DB9 end pins 1,2,3,4,5,6,7,8

On the DB25 end pins 2,3,4,6,7,8,20

The actual wires connect as follows:

DB9    to    DB25

  1               6

  2               4

  3               3

  4               2

  5               7

  6              20

  7               8

 

Even though there are more pins on the DB25 end, none of them are used.

And under no circumstances should you every try to plug any type of serial cable to port 4 on the 850 and your modem!

 

David      

[_The Doctor__]

what happens if you do that?

[+DavidMil]

8 minutes ago, _The Doctor__ said:

what happens if you do that?

On the CX88 cable, nothing.  But any industry standard cable attached to pin 9 on port 4 of the 850 will dump

-8 volts into your modem. I blew my Hayes 300 baud Smartmodem that way before I learned that you shouldn't

use any cable but an Atari cable with the 850.

 

David

 

[Mclaneinc]

Ouch...Not a good way to learn....

[+DavidMil]

16 hours ago, DavidMil said:

I promised someone a while back that I would post the pinouts for the CX88 Terminal Cable, so here they are.

Both ends of this cable have male connectors and only seven of the pins on each end are used.  They are:

On the DB9 end pins 1,2,3,4,5,6,7,8

On the DB25 end pins 2,3,4,6,7,8,20

The actual wires connect as follows:

DB9    to    DB25

  1               6

  2               4

  3               3

  4               2

  5               7

  6              20

  7               8

 

Even though there are more pins on the DB25 end, none of them are used.

And under no circumstances should you every try to plug any type of serial cable to port 4 on the 850 and your modem!

 

David      

Sorry, seems like I've got happy fingers that like to keep typing.  On the DB9 connector on pins 1 through 7 are used

Not 8.

 

David

[BillC]

On 8/13/2019 at 11:45 PM, DavidMil said:

On the CX88 cable, nothing.  But any industry standard cable attached to pin 9 on port 4 of the 850 will dump

-8 volts into your modem. I blew my Hayes 300 baud Smartmodem that way before I learned that you shouldn't

use any cable but an Atari cable with the 850.

 

David

Since the 850 serial ports are a different gender than the industry standard(850-DE9F vs. PC-DE9M) it would be difficult to use any cable but one made specifically for the 850(or the ICD MIO/PRC).

[Urchlay]

DB-9 gender changers can be had for next to nothing, if someone's really
determined to use the wrong cable...

[_The Doctor__]

oh and they certainly show determination don't they!