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keirf / greaseweazle

Tools for accessing a floppy drive at the raw flux level
The Unlicense
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5.25 loppy drives with density pin #435

Closed briskspirit closed 1 month ago

briskspirit commented 4 months ago

Hi all!

I have a Compaq Portable 3 floppy drive that supports both double density and high density 5.25 floppy diskettes. When it is connected to original PC - it works fine with both densities and shows it with LED being orange for DD and green for HD.

I have tried to use gw pi set 2 high (or low) to toggle density selection and floppy reacts with the proper LED color but on read or write gw still tries to step as it is HD diskette (with 80 track iirc.) That's considering that I explicitly select type as ibm 360.

How to fix this issue? Do I have to make manual script where I should skip every even track? And why GW assumes 80 tracks per disk if ibm 360 was selected?

Also thanks a lot for such a great product! Works perfectly with my 8" Shugart.

keirf commented 4 months ago

GW "becomes" a 40 cyl drive when a 40 cyl image is mounted -- one step per cylinder.

Is the Compaq double-stepping for 48tpi disk types?

keirf commented 4 months ago

A more coherent response: Try --tracks=step=2 on your command line, to enable double-stepping for 48tpi disks.

Let me know how you get on.

briskspirit commented 3 months ago

GW "becomes" a 40 cyl drive when a 40 cyl image is mounted -- one step per cylinder.

Is the Compaq double-stepping for 48tpi disk types?

I understand how it can "become" 40 cyl when writing, but I had issue with reading. And yes, it's double stepping when pin 2 sets accordingly

A more coherent response: Try --tracks=step=2 on your command line, to enable double-stepping for 48tpi disks.

Let me know how you get on.

I don't have a chance to check it with Compaq drive anymore, but got Canon MD5511 (just a dual drive). It also had same "issue" as in my initial post(reading SD floppy in DD drive) but your fix helped! Think would be nice to have optional key like "--drive_density" for that?

briskspirit commented 3 months ago

Also seems I need this option to double step if I want to write SD image (ibm.360) with DD floppy drive, but write function doesn't have it.

keirf commented 3 months ago

You can specify --step=2 to gw write as well. However you cannot reliably write a 48tpi disk with a 96tpi drive because it will write tracks which are too narrow.