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From: Marko_Mäkelä
Date: 2000-08-14
Subject: RE: I need help.

Hi Rafael,

> I checked the fuse in the computer and it seemed to be o.k.

That fuse ought to be for the 9 volts circuit anyway, and the LED uses the
5 volt supply. According to one of the schematic diagrams at
<URL:http://www.funet.fi/pub/cbm/schematics/computers/c64/>, the pin-out is: 1,2,3=GND, 4,5=VCC, 7,6=9 volts AC (between pins 7 and 6, not e.g.
between GND and pins 7 or 6).

> But I have a PS for a plus/4, which - at least the markings are
> telling so - has similar parameters. Both PSs have round connectors,
> and the plus/4 works fine. So can I check with it the 64?

Is there a plus/4 power supply with a round connector? I thought they use square 4-pin connectors. It's better that you measure the voltages from to be sure.

Marko