3.5 inch 2.88MB (4MB unformatted) Drive?

[Ratteler]

I have one of these drives. Can Greaseweazle 4, or any version, be used to make it function?
I primarily work in Linux, but I'll consider anything that works.

[keirf]

It may work, but the required bandwidth is close to Full Speed USB's capacity. For reliability I either need to revise the data protocol, or you need to use a hard-to-find Greaseweazle Lightning Plus (it has High Speed USB). But you could give it a go over Full Speed USB right now.

[Holgerlx]

Tested with a Greaseweazle V4, the bandwidth seems just about sufficient. So far I hadn't had any error messages. In this context, is support for an IMG format ibm.2880 planned/possible?



[keirf]

Yes I will add ibm.2880. Remind me when I'm back next week!

[Holgerlx]

Reminder to add ibm.2880 IMG format. :-)

[keirf]

Okay, please try the test build linked as an artifact from here: https://github.com/keirf/greaseweazle/actions/runs/2867655923

Or you can find the source on branch ibm2880.

If it works okay I will merge to master and it will be in next release.

[keirf]

For example, if you previously made a raw dump to scp you could try gw convert --format=ibm.2880 my.scp my.img

[Holger6504]

My tests so far:

Greaseweazle F1
gw read image.scp ok
gw read --format ibm.2880 image.img ok
gw convert --format ibm.2880 image.scp image.img ok
gw write image.scp nok -> Flux Underflow
gw write --format ibm.2880 image.img nok -> Flux Underflow
Read test with HxCFloppyEmulator software ok

Greaseweazle V4
gw read image.scp ok
gw read --format ibm.2880 image.img ok
gw convert --format ibm.2880 image.scp image.img ok
gw write image.scp ok
gw write --format ibm.2880 image.img ok
Read test with HxCFloppyEmulator software ok
Read test with IBM PC ok

Works flawlessly.
Many Thanks!

[keirf]

Could you send me or upload an scp dump of an original ED disk (not one made by greaseweazle)? Interested to see what offset track data starts from index mark. Whether it is same number of bits as an HD track or twice as many (since bits are half the size).

[Holger6504]

3,5" ED floppy image, disk formatted with Win98SE.
3.5_ED_Floppy.zip