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Thread: Modifying PC Floppy Drive for Amiga Use

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    Math inside Amibayer! BLTCON0's Avatar
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    Default Modifying PC Floppy Drive for Amiga Use

    Sorry to hijack, but can you provide a pointer to the modification you performed? I tried to convert three such Samsungs a few months ago following some info in an EAB thread and, while it worked, the drives kept re-reading everything 2-3 times before moving on, leading to excess noise and slower performance. Strange thing is a couple of games with custom loaders apparently worked fine. I'm wildly curious.
    Thanks!

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    Enzo45s's Avatar
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    OK DyLucke, payment received
    Remember to PM me your home address, then I can ship it.

    @BLTCON0:

    For sure mate, here's the modification I did:







    What you need:

    A welder,
    A small cable (4-5 cm lenght)
    A tweezer

    Translation of the instructions:
    Picture 1: Move the DS0/DS1 jumper from DS1 to DS0;
    Picture 2: Solder and end of a small cable on ribbon connector's pin 2;
    Picture 3: Move the DC resistor to RDY helping you with the tweezer, then solder the other end of the cable on DC (just as seen in the picture). So now you bridged DC with the pin 2 of the ribbon connector.

    (Pictures are from Matteo90's tutorial on AmigaNews.it - http://amiga.ikirsector.it/forum/vie...p?f=38&t=14330)

    I modified all the drives using an hot air soldering station.
    Here's a video showing how the drive works on my A1200 - http://www.youtube.com/watch?v=2J4yzpCReyg
    Last edited by Enzo45s; 7th August 2011 at 17:13.
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    @Enzo45

    Great guide, great product and very nice video

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    Is great guide, and mod looks well done.

    Why not short the hd switch to always dd? So no tape is needed?
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    Math inside Amibayer! BLTCON0's Avatar
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    @Enzo45s
    Thanks mate, great stuff and very well done mod!

    I still have one of those SFD-321B's, it's marked /EZ rev S2, I'll have another look at it according to your guide. Looks different from yours though.

    I second jvdbossc's suggestion too (as long as the diskchange signal doesn't get killed along).

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    Math inside Amibayer! BLTCON0's Avatar
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    Mod done and works a treat! My SFD-321B is indeed different, but all points of interest were there.
    As for the always-DD fix, my model uses the 'active open' type switch so it can't be shorted.

    No disk: 1-3 & 2-3 shorted
    HD disk: 1-3 shorted
    DD disk: (none shorted)

    but obviously it's easily converted to always-DD by just desoldering the high-density switch.
    This doesn't harm the diskchange signal (apparently it's controlled by the other switch).
    And we get a spare switch to replace the other one should it ever fail
    Attached Thumbnails Attached Thumbnails sam_pads.jpg   sam_switch.jpg  

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    Ya' Like it Retr0? VIP Zetr0's Avatar
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    I have split these posts from this for sale thread and placed them into a new thread on how to modify an existing brand of PC floppy Disk Drive.
    8)Flux Mastah' Zee8)
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    Math inside Amibayer! BLTCON0's Avatar
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    Default Alps df354h (148f)

    Here's another type of PC floppy drive modified for Amiga use - this time an ALPS DF354H (Revision 148F, but I don't think the revision matters - I've done this to a 121G too.)

    Image attached, labelled as follows: (Feel free to cringe at my dodgy soldering!)

    A: Use desoldering braid to remove solder from DS1 pads, bridge DS0 pads with solder. (Cause the drive to appear as unit 0, as expected by the Amiga.)

    B: Cut trace leading from pin 2 of socket to chip. (Disconnect the redundant HD signal)

    C: Cut trace leading from pin 34 of socket to chip pin 5. (This is the diskchange signal, which we re-route to pin 2 in step E.)

    D: Solder a wire from pin 34 of the socket to pad marked "RD". (Makes the Disk Ready signal available to the Amiga)

    E: Solder a wire from pin 2 of the socket to pin 5 of the chip. (Re-routing the diskchange signal.)

    F: Solder a wire from the pad marked HD2 to the pad at the top left which happens to be a convenient ground. (Bypasses the HD detect switch so all disks are treated as DD - thus no need for tape over the HD holes.)

    Hope someone finds that useful.
    Attached Thumbnails Attached Thumbnails ALPSDF354H148F.jpg  

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    @Zetr0: Well done! Thanks

    @BLTCON0: I removed the HD switch from one of my drives and it works very well! Thanks again for the advice mate

    @robinsonb5: That's interesting, I surely have some Alps Electric drives so I'll try to do it, thanks!

    Does anybody know if there is a PC floppy drive modifiable for Amiga use but as an HD (1,68mb) drive? That would be veeeeery interesting
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