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5 pin SQUARE female connector layout
5 pin SQUARE female connector

May be Signal ground is pin 3, 5 Vdc is pin 2, 12 Vdc is pin 4, - 12 Vdc is pin 5 and shielded ground is pin 1 ?? 

Pin Name
1 +5V
2 Shield Ground
3 +12V
4 Signal Ground
5 -12V

Note: The Amiga 500/600/1200 power supply input is identical in shape to that of the Commodore C128, but they are *not* compatible. Using The Amiga:s PSU on a C128 or vice versa will most likely kill your hardware!!!!!!!

The pins described here correspond to the connector ON THE AMIGA itself

According to 8 reports in our database (6 positive and 0 negative) the Amiga 500/600/1200 Power Supply pinout should be correct.

Is this pinout
Source(s) of this and additional information: Amiga Power Supply pinouts at National Amiga, from Hardware Book
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