Re: Repairing a SFD-1001 (8250/LP, 8050, 4040, 3040, 2040)

From: Anders Carlsson <>
Date: Tue, 9 Aug 2011 15:45:56 +0200
Message-ID: <2C945F19F82C476FB80BD1C2B9C024F0@ryds>
Marko Mäkelä wrote:

> IIRC, cbmlink -dmco will dump the floppy controller ROM.

Yes, I just saw the documentation. In order to avoid confusion, is this 
correct terminology?

Disk controller (Rhialto/Moser) = Controller address space (cbmlink)
Bus controller (Rhialto/Moser) = Main address space (cbmlink)

In that case, would it be enough to use the cbmlink -dmco and -dmso calls to 
appropriate addresses, or do we still need to load Rhialto's program to copy 
from DC to BC? I saw in the cbmlink documentation that the drive might act 
strange after -dmco has been used, which matches what Wolfgang wrote with 
the drive getting stuck. I'm not afraid to reset it afterwards, in 
particular if the dumped data is safely stored on a PC.

Then comes the next question: in order to know which chip one has, I suppose 
we'll need to open up the drives and look for markings. DOS version can be 
fairly easily read by reading the error channel upon reset.

Indeed I only have a 2031 and a 8250LP left, but as I didn't any mention of 
the 2031 in Wolfgang's list, I suppose it either shares RRIOT with the 2040, 
3040 or 4040 or was omitted for one reason or another. There's also the 
2031LP which might want to be on the list, as even the 8280 was mentioned...

Best regards

Anders Carlsson

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Received on 2011-08-09 14:00:33

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