Re: CBM-900 floppy disk format/encoding

From: Gerrit Heitsch <>
Date: Sat, 29 Oct 2011 08:12:07 +0200
Message-ID: <>
On 10/28/2011 11:31 PM, Uffe Jakobsen wrote:
> The system is well preserved and looks fine. But time will tell.
> I guess that the system have been powered off for more that 20 years
> now. The power supply needs a checkup in order to make sure that it does
> not blow the components away. A vario trafo (variable transformer) will
> be applied in order to be able to slowly increase the power while
> preserving the sinus curve on the secondary side. This usually prevents
> old capacitors from blowing off.

Before you do anything of that kind you might want to dump all the 
EPROMs since those were (back then) usually only meant to last for 10 
years or so. And if they contain garbage try again with reduced supply 
voltage (a 1N4148 added between EPROM and programmer).


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Received on 2011-10-29 07:00:03

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