[Info-vax] VAX 4000 105 power supply

[Joseph Floyd]

I think I have to correct pinout -- 

This info comes from a discussion http://www.classiccmp.org/pipermail/cctalk/2020-June/053844.html

-------------------------------------------------------
For the VXT-2000 with an H7109-B the rated voltage and current values
are printed right on the power supply label:

+5.1V, 7.81A
+12.1V, 0.62A
-12.1V, 0.46A
-9V, 0.2A
 
Fixed width character pinout diagram:
 
       +=================+
   -9V | Yellow | Orange | +12.1V
       +--------+--------+
   ??? | White  | Black  | Gnd
       +--------+--------+
 +5.1V | Red    | Blue   | -12.1V
       +--------+--------+
 +5.1V | Red    | Black  | Gnd
       +--------+--------+
   Gnd | Black  | Black  | Gnd
       +=================+
-------------------------------------------------------

The H7819-AA  is used with the VAX 4000 90/100/105/106/108 systems and the discussion referenced above seems to indicate that many of DecStation and Microvax systems shared the same power supply pinout and voltages, but with different current capacities depending upon system configuration. 

Other than the -9V the voltages referenced all a used with common ATX power supplies.    Using -9V regulator from the 12V rail would seem like a pretty straightforward way to adapt a cheap PC ATX power supply for VAX use.