Posted By
MMS
on 2017-07-13
15:54:38
 |  Re: Rare Commodore SFD1001 disk drive
UPDATE on the IEC2IEEE interface + SDF-1001 disc format
The emulation and handling of the SFD-1001 (or Commodore 8050 in big house or 8250) discs an be done with Dirmaster.
It can create and edit the *.D82 double sided discs has this 1MB size. (4133 blocks)
SFD-1001 is a single drive and small housing version of the 8250 huge beast. The IEC2IEEE can handle those big guys too.
https://en.wikipedia.org/wiki/Commodore_8050
http://www.commodore.ca/manuals/commodore_1541_4040_8050_8250_comparison.htm
There are some misconcept s on the intrnet. The 8520 double sided disc capacity is only 1MB, and the 8050's sindle side is 0.5 MB.
The 8250 has the capacity of 2MB, but not because of double sided discs, but because it has two parellel drives.
Currently only the VICE supports D80 and D82 disc formats, as previously there was no card or interface to manage IEEE488 devices on Plus/4.
If I get some authorization, I will create a PDF our of NLQ's documentation, and upload it to the Hardware section with next to the Interface's picture
(I may open the housing to show the parts, as on NLQs original page).
This weekend I plan to copy from 1571 to SFD-1001 a bigger (maybe 200block) file and will test the loading speed VS 1571 or 1541/II on the same IEC bus.
Would be surprising if any speed difference is there, but who knows?
Test will still happen on a C64, as the userport connector not soldered yet.
Actually I am thinking, that the Cassette port (especially a "through" connector) would be better for the 264 series (would become compatible with the C16 and C116 too)
I am not brave enough to touch the Expansion port :-)
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