Flippy Disk Confusion Between Commodore 1571 vs 1541 Drive

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brightcaster
Posts: 352
Joined: Fri Nov 08, 2013 10:48 pm

Re: Flippy Disk Confusion Between Commodore 1571 vs 1541 Drive

Post by brightcaster »

Yes of course, there are so many "errors" that it seems to be unformatted. Looking to the scatter plot ("View/Scatter Window" from the GUIs menu) shows that the second side in fact is very well formatted! Its just the wrong format (opposite direction) and therefore not in the pattern you choosed to decode...

To make a preselection for your floppies, you may also view at the write protection. Flippy disk should have two notches, one for each side. Real double sided disks(like 1571 format) do need only one notch for writing on both sides.

David
whitehusky
Posts: 9
Joined: Sat Aug 01, 2020 3:31 am

Re: Flippy Disk Confusion Between Commodore 1571 vs 1541 Drive

Post by whitehusky »

I'm trying to create an image of a 1571 double sided formatted disk (an old data disk I had on my 128), but not sure how to do it. The standard CBM formats seem to create s0 and s1 files separately. When I copy that to a new profile, select Both Sides, and turn off Flippy mode, I still get two files, rather than a single larger file. Can someone tell me the right settings to image a double sided 1571 disk? Attaching the sector map.
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Screen Shot 2020-10-07 at 11.16.09 AM.png
brightcaster
Posts: 352
Joined: Fri Nov 08, 2013 10:48 pm

Re: Flippy Disk Confusion Between Commodore 1571 vs 1541 Drive

Post by brightcaster »

It looks as if this dump was made with a flippy modded drive, hence the 4 track offset and the track numbering errors.

David
whitehusky
Posts: 9
Joined: Sat Aug 01, 2020 3:31 am

Re: Flippy Disk Confusion Between Commodore 1571 vs 1541 Drive

Post by whitehusky »

It was - that's correct - but still with Flippy mode turned off in the profile. I seem to have found the dtc command to make a 1571 image:

Assume the file we want to create is going to be "data2"

dtc -l8 -t10 -dd1 -fdata2 -i0 -fdata2.d64 -g2 -i6 >data2.txt
cat data2_s0.d64 data2_s1.d64 > data2.d71

That will save the stream files in case you want to redo anything later. I haven't found a way to:
1. automatically create 1 file instead of 2 that have to be combined
2. how to do this in the GUI

But, at least this method seems to work.
brightcaster
Posts: 352
Joined: Fri Nov 08, 2013 10:48 pm

Re: Flippy Disk Confusion Between Commodore 1571 vs 1541 Drive

Post by brightcaster »

There is no double sided format defined in .d64 nor .g64! But there is a script in the last posting of this thread viewtopic.php?f=3&t=495 to create a .d71 image...

But this only works with a standard floppy drive. A modified flippy drive with a realigned head (TEAC type) or a -b-8 parameter (panasonic type) would show results as seen in the screenshot you did send!

David
markusC64
Posts: 11
Joined: Wed Mar 09, 2016 5:01 pm

Re: Flippy Disk Confusion Between Commodore 1571 vs 1541 Drive

Post by markusC64 »

brightcaster wrote: Wed Oct 07, 2020 7:31 pm There is no double sided format defined in .d64 nor .g64!
True. But there is an extension of g64 named g71 to support double sided disks. Just dtc.exe does not support creating it. Starting with version 3.0, g64conv ( www.github.com/markusC64/g64conv ) supports converting stream files to g71. But also to g64 and p64 (single and double sided).

Except version 3.1 with minor bugfixes soon - or use the source code from the master branch.
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