Mohawk Data Sciences 6401 Schematic?

Cory Heisterkamp coryheisterkamp at
Sat Sep 7 20:11:03 CDT 2019

Hey Guys,

I recently picked up an MDS 6401 Key-To-Tape unit in NCR guise to park next to my keypunches. It's been in storage for a couple decades and is in pretty decent shape. Even has a tape on it from when the university that had it pulled the plug and sent it off for surplus. Found an internal date code of 1971.

The unit does actually show signs of life, but I suspect a power supply issue. Does anyone have a lead on a schematic?

This here is basically what I'm working with:


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