220v on unixpc

[Ralph Freudenberger]

In the very near future I'm going to find it necessary to run my unix-pc
(3b1 67x2meg) on 220 volts and 50hz.

I've called at&t and i'm getting conflicting solutions. One person claims
there's only a jumper on the power supply while another person sent me
a whole schematic on inserting a few diodes to make the power supply accept
220.

Does anybody out there know the true answer? Or does anybody have complete
power supply schematics so that my EE friend can digest them??

		ralph f.  (freuden at gryphon.cts.com)