A1200: now a PSU issue...

[Stedy]

@starf81

Did you try connecting the car bulbs to the 3.3V supply?

Measure the voltage at the PWR-OK (pin 8, wire colour Grey), it it above 2.0V?

Have you re-wired the Amiga power plug to the ATX PSU?

Try connecting pins 1 to 11 (3.3V to 3.3V sense) and see if it helps.

My 6 year old ATX PSU powers my Amiga fine. I will check a spare (more modern) PSU if I get a chance and see how well that works.

Ian

[Stedy]

@starf81,

Check for the +5V and 0V here:



I have indicated where to probe, I can't remember which is +5V and 0V but you will soon see on your DMM.

Once you find which is +5V and 0V, connect from your ATX PSU to your Apollo card using one of the floppy drive connectors of the PSU. It may sound daft but I had to do a similar thing to get my damn SX32 to work, once I had done that, it worked fine.

As a guide, the +5V rail should be above 4.85 Volts when measured with a DMM for the CPU to work, this allows for 100mv of noise the meter will not 'see'.