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

Hello again,

Anders Carlsson schrieb:
> 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.

yes of course, that's what I wanted to express with the adjective
"authentic". I would like to know about exact chip numbers, maybe chip
types (ceramic, plastic), printed adhesive label or standard number
directly printed onto the chip, ...

> 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.

The 2031 HP (High Profile) is no dual-CPU disk drive, it does not
contain a RRIOT. It is similar to the 2031 LP that is very similar to
the 1541 except for the VIA-to-IEEE interface bus.

> There's
> also the 2031LP which might want to be on the list, as even the 8280 was
> mentioned....

The 2031 LP also does not contain a 6530 RRIOT which was my intention
for this list. I don't know anything about the 8280 or the 9060/9090 and
may be wrong in assuming that these three devices also contain RRIOT chips.


Anders, as far as I remember sometime in the past you told that the well
known dumper programs from William, Olaf and Marko are not able to dump
the RRIOT ROM and probably the DOS ROMs too from your DOS-1 equipped
floppy. Did you ever find out what cases this inability? I am willing to
try to fix my dumper to get this job done as long as we can find out
that there is a way that will work in the end.


Womo

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