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Conference hydra::amiga_v1

Title:AMIGA NOTES
Notice:Join us in the *NEW* conference - HYDRA::AMIGA_V2
Moderator:HYDRA::MOORE
Created:Sat Apr 26 1986
Last Modified:Wed Feb 05 1992
Last Successful Update:Fri Jun 06 1997
Number of topics:5378
Total number of notes:38326

2283.0. "IBM 720K =?= Amiga 880K" by STOUT::MCAFEE (Steve McAfee) Mon Feb 27 1989 17:23

    Will normal IBM 720K 3.5" disk drives work in an Amiga 2000 as
    880K drives?
    
    - steve mcafee
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2283.1Yep... Used it!CSSE::WARDMon Feb 27 1989 17:359
    Yes, DOS-2-DOS on a 1000 external drive (R/W) works with 720K
    off a PS/2 Model 80 created 3.5"
    
    The MSDOS command is FORMAT B:/T:80/N:9 for eigthy tracks with
    9 sectors per track.  The 1.44M disk has 18 sectors per track.
    
    ASCII files will fill-up a MS-DOS disk like this slightly faster
    than the Amiga version.
    
2283.2STOUT::MCAFEESteve McAfeeMon Feb 27 1989 17:529
    Sorry, I didn't make myself clear.  I meant... Can I buy an MSDOS
    720K 3.5" disk drive and install it into my A2000 as DF1: ?
    
    I was under the impression that Amiga drives were the same as those
    used as 720K format drives in IBM/Clone machines.  I believe the
    720K vs 880K is simply due to software (No spacing between tracks
    on the Amiga).
    
    -steve
2283.3BAGELS::BRANNONDave BrannonMon Feb 27 1989 20:496
    re: .2
    
    you are correct.  Previous notes describe how to do that.  Just
    make sure you get a 720k drive, not a 1.44Meg drive.
    
    -Dave
2283.4STOUT::MCAFEESteve McAfeeTue Feb 28 1989 11:529
    re: .3
    
    I thought the info was in here somewhere, but I haven't been able to find
    it.  Any idea what note?  I've tried meaningful title phrases and
    keywords without any luck.
    
    thanks,
    
    steve
2283.5need Autoconfig circuit alsoSAUTER::SAUTERJohn SauterTue Feb 28 1989 13:265
    I don't think it's quite as simple as just installing the drive.
    In order for the Amiga's auto-configuration software to work, the drive
    must identify itself.  There is a circuit you can build which will do
    that.
        John Sauter
2283.6BAGELS::BRANNONDave BrannonTue Feb 28 1989 19:569
    re:.5
    
    He is talking about the A2000, which has the drive id circuit on
    the motherboard for the second floppy.  You need to put a jumper
    plug on J301 to enable it.
    
    Then set the drive select on the 2nd disk drive to be drive 1.
    
    -Dave