Re: MFM drive gone nuts

From: Michał Pleban <>
Date: Tue, 22 Jul 2014 11:02:44 +0200
Message-ID: <>

Martin Hoffmann-Vetter wrote:

> Is there a problem with the power supply? The hard drive use the +5V and +12V. The dynamic RAM uses only +5V. What happens with the +5V?

I measured the voltage in the running system and both +5V and +12V
voltages are good.

On a side note: I replaced the failed TMS4256 chip with a stock 41256
chip I had in my supplies, but it did not work. I thought all the x256
DRAM chips should be interchangeable? Is there anything special about
the TMS4256?


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Received on 2014-07-22 10:00:02

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