IBM 4331 Mainframe

Paul Koning paulkoning at
Mon May 1 07:42:26 CDT 2017

> On May 1, 2017, at 12:38 AM, Guy Sotomayor Jr via cctalk <cctalk at> wrote:
> Just to let folks know that I finally moved the IBM 4331 Mainframe this past weekend
> from where it was currently stored to my shop.  Pictures are here: 
> <>
> As can be seen in the pictures, it filled a 26’ box truck that I had rented for this purpose.
> Right now I just have it placed somewhat in my shop.  Some early tasks will be:
>   * I have to verify that I have everything.  Even if I missed some items, they won’t be
>     scrapped.  I just need to go over what is currently in my shop and verify that I didn’t
>     leave anything behind.  I’m mostly worried about cables at this point.
>  * I have to figure out some way to produce enough “clean” 3-phase power to run the
>    peripherals (the CPU is 220v single phase) as I only have 220v single phase coming
>    into my shop.

What do they use 3-phase for?  Motors?  I remember disk drives with 3 phase motors.  If so, a VFD is a good low cost solution since those are specifically designed for driving motors.


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