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IBM PS/2 Model 70 8570 Hard Drive Light

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I have a very nice Model 70, which I have been working on for a while now, and have it set up and running smoothly with a 2GB SCSI hard drive running off a Future Domain MCS-600 SCSI card.

The only remaining thing I feel I need to do on it, is to connect up the hard drive light/LED, which is sitting on the power supply. Does anyone know how to connect the drive light up? How does it get its signal?

The only input to the power supply is a 50-pin card edge connector which plugs into the 8570 motherboard. The pinout for this shows most of them allocated to +12V, -12V, +5V, and DC return. The only other connections are "System Status" and "Power Good".

When you plug in just the power supply by itself (not connected to the motherboard), both the power light and drive light stay on.

Any thoughts?

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