Internal modern 1.44MB 3.5 drive for +3

edited December 2012 in Hardware
Hello!

this
http://www.secarica.ro/html/plus3_hardware.html#3and5inchdrive

says that modern 1.44MB 3.5 driver are unusable as interval drive A for +3.

However, as shown here:
http://www.cpcwiki.eu/imgs/2/21/CableClose1.JPG

one can use cable jumper to select side and drive.

So, why can't i just make a cable jumper to make the drive A: and the make
external switch for side selection and also connect READY to ground to always get READY OR to an external switch to manually turn on ready when disk is ready ?

Why shouldn't it work?

By the way, the link on secarica says that one cannot format disks in a 720K driver for +3. I don't know about that, but i myself formated disks in external 3.5" with simple "format b:". The disk was 1.44MB with taped hole to make it seem DD.
Post edited by ArtemKuchin on

Comments

  • edited December 2012
    but it doesn't say its unusable, just there are some problems.
    perhaps BASIC can't format them as 720K, only as 180K.
    iirc, du54 has advanced format options.
  • edited December 2012
    Why shouldn't it work?
    It does, you can ignore most of the details on there about needing specific models of drive etc. Any PC floppy drive should work fine if you ground the READY signal
    By the way, the link on secarica says that one cannot format disks in a 720K driver for +3. I don't know about that, but i myself formated disks in external 3.5" with simple "format b:". The disk was 1.44MB with taped hole to make it seem DD.

    Are you sure? I was under the impression that the +3DOS rom cannot do that. I always use Garry Lancaster's "MFORMAT" tool.
    My rubbish website including the redrawn Amstrad schematics and the new home of the Sinclair FAQ wiki.
  • BCHBCH
    edited December 2012
    As far as I know +3 ROMs cannot format other than 180k per disk. To get 720k disks you need to either format them on a pc with CPCdiskXP utility or on the +3 with the dkit720k utility. Perhaps there are some other utilities I dont know about; I just use those above.

    You can format 3,5" DSDD (or DSHD blocking the hole) disks on the +3 but you will only get 180k per disk.

    As for the drive, IMO the best is to get a one capable of output READY signal. A Samsung sdf-321b for example (its a very common drive) can output the signal by resoldering a juper inside. Then you only need to add a switch to access the 2nd side of the disk.

    Theres is a cool article about this here (in spanish though):
    http://magazinezx.speccy.org/05/hardware.html
  • edited December 2012
    "MFORMAT" will format to various capacities.

    "MSDOS
    " is useful to, it can log onto a 720k fat formatted disk and copy files to a +3DOS disk
    My rubbish website including the redrawn Amstrad schematics and the new home of the Sinclair FAQ wiki.
  • edited December 2012
    Of course i mean i can format 180K only, but i can :)

    Thank everyone for the info and for the article and fdd model. I will really try to find such model and install it. That would make life a lot easier.

    Would be interesting to find a model list of fdds which can provide ready signal with minor modification to pcb. Samsung sdf-321b is pretty rare nowadays and pretty expensive too, about 20$.
    so far i found this: http://www.cpcwiki.eu/index.php/Modify_PC_floppy_drives
    and this
    http://eab.abime.net/archive/index.php/t-30944.html
    it is a great thread and it mentions SONY MPF920-Z which is VERY chip (5$ new) and popular now.
    http://eab.abime.net/showthread.php?t=43265
  • edited December 2012
    about the READY/RDY signal, I have used a diode solution, like this: http://www.amiga.org/gallery/images/1762/1_3520.png

    it works nicely. still better use one of those drives with built-in RDY. also many drives can be modified to enable it (jumpers and similar), check this thread:
    http://eab.abime.net/showthread.php?t=30944

    (yes, Amigas have same problem)
  • edited December 2012
    Would be interesting to find a model list of fdds which can provide ready signal with minor modification to pcb.

    You could try something with the disk detect switch. I've never bothered myself, I just use a manual toggle switch wired in.

    If it works by pulling a line down to 0v you can just wire that to the READY line. If it switches a voltage though you'd have to use it to drive a transistor switch across the READY line.
    My rubbish website including the redrawn Amstrad schematics and the new home of the Sinclair FAQ wiki.
  • BCHBCH
    edited December 2012
    orange wrote: »
    about the READY/RDY signal, I have used a diode solution, like this: http://www.amiga.org/gallery/images/1762/1_3520.png

    Looks like a good solution. Do you also cross the 10 and 12 lines? What kind of diode did you used?
  • edited December 2012
    BCH wrote: »
    Looks like a good solution. Do you also cross the 10 and 12 lines? What kind of diode did you used?

    yes, lines 10 and 12 are crossed. iirc, I used ordinary 1N4148.
    it wasn't my idea, I found it here: http://aminet.net/docs/hard/Floppy_fix.lha
    aminet has various solutions for RDY signal. some are better, but more complex.

    there is an even simpler fix, using just a wire:
    http://blog.elpilotohernan.com.ar/category/amiga/hardware/cambiar-disquetera-de-amiga/

    but, like said, its probably best to simply find RDY on drive PCB.
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