68kMLA Classic Interface

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Posted by: Classic Mac on 2013-11-29 17:23:30
Here's another cord that I picked up. It says 'Motorola' on it. It goes from a serial plug to two 25-pin SCSI plugs, one male and one female. What could it be? :?:

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Posted by: bigmessowires on 2013-11-29 17:51:47
The external connector for a serial port can be either 9 or 25 pins. So I don't think that's SCSI, it's just 25-pin serial.

Posted by: gsteemso on 2013-11-29 18:37:35
A 25-pin serial connector actually has two sets of serial data pins, the main one and a “control channel” (can’t recall what the exact terminology was). Maybe this thing splits out the control channel into a separate plug? It uses the same signalling format AFAIK, so it should work.

Posted by: mcdermd on 2013-11-29 18:53:55
Probably just for old comm equipment.

Posted by: commodorejohn on 2013-11-29 19:09:49
A 25-pin serial connector actually has two sets of serial data pins, the main one and a “control channel” (can’t recall what the exact terminology was). Maybe this thing splits out the control channel into a separate plug? It uses the same signalling format AFAIK, so it should work.
Interesting information, but I'm betting it's just a serial cable with both 9- and 25-pin connectors on one end. They're pretty common.

Posted by: CelGen on 2013-11-29 21:49:24
The sticker notes it's a POWER CABLE, so it's probably neither for parallel , SCSI or Serial but something more proprietary that used D-sub 25 and 9.

Posted by: Trash80toHP_Mini on 2013-11-29 22:27:56
I've seen serial cables for POS equipment that have a power jack wire hanging off the DE-9 interface at the computer end for running a remote piece of serial connection hardware from a wall wart inside or underneath the terminal box. Could be something similar.

Posted by: mcdermd on 2013-11-29 23:06:44
I was thinking something for the Motorola Codex multiplexer boxes, etc.

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