02/25/98: Floppy drive ???? by pucc_unknown, | Category: Princeton | 3 comments - (Comments are closed)

Floppy drive ????

Date: Wed, 25 Feb 1998 22:20:50 -0500
Reply-To: “G. Douglas Burton” Sender: COCO – Tandy Color Computer List
From: “G. Douglas Burton” Subject: Floppy drive ????

I bought a floppy drive with controller off of someone on this list last
year. Sorry, can’t remember who right at the moment. Anyway, I want to
replace the single full-height floppy with 2 half-height units. My first
question is will the power supply in the case support 2 drives? And
secondly, how are the drives setup for the controller? The old drive has
jumpers and uses the cable connector nearest to the computer. I can’t find
any such jumpers on the newer half-height drives. Any help greatly
appreciated…

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=B8.=B7=B4=AF
{ Just a message from Doug }
{ http://www.seidata.com/~gdburton }
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=B4=AF`=B7.=B8

3 comments to Floppy drive ????

  • pucc_unknown

    Date: Thu, 26 Feb 1998 00:11:38 -0600
    Reply-To: Jeremiah Coleman
    Sender: COCO – Tandy Color Computer List
    From: Jeremiah Coleman
    Subject: Re: Floppy drive ????

    At 01:07 AM 2/26/98 LCL, Roger Merchberger wrote:
    >MFM recorded High Density — These are the 1.2Meg IBM 5.25″ floppy drives.
    >A few of these drives have the jumper capacity to be downgraded to the Quad
    >Density status; otherwise they won’t work on the CoCo to my knowledge.
    >For IBM 3.5″ floppies, these are the 1.44Meggers. These will work
    >successfully provided: 1 you disable the High density capability of the
    >drive either via jumper selection or permanantly enabling the DD switch,
    >or 2 use only 720K media to manually enable the DD switch — 1.44Meg
    >floppies as a rule — I’m not counting SCSI floppies or using FHL’s
    >Eliminator controller which was good for only OS-9 are not possible on the
    >CoCo.

    Small correction, most at least all of the dozens/hundreds I’ve worked
    with 3.5″ 1.44′s will work as DD 720K drives _even_ with 1.44 media
    provided one places a piece of tape over upper-left hand hole in the
    disk casing. I only throw this in cuz its damn difficult to find
    3.5″ DD disks anymore, and I happen to have an old PC system
    whose BIOS just plain can’t figure out where the hell all these
    sectors are supposed to be…

    Jay

    —————————————————————
    | Jeremiah Coleman ICQ#-1705655 ranger [at] 1stnet [dot] com |
    | “Luke, stay away from the darker side, |
    | and if you ever go astray, let the force be your guide” |
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  • pucc_unknown

    Date: Thu, 26 Feb 1998 00:32:04 -0600
    Reply-To: Carl Boll – System Operator
    Sender: COCO – Tandy Color Computer List
    From: Carl Boll – System Operator
    Subject: Re: Floppy drive ????
    In-Reply-To: <199802260322 [dot] VAA26365 [at] mail [dot] xnet [dot] com> from “G. Douglas Burton” at
    Feb 25, 98 10:20:50 pm

    While thinking of something else G. Douglas Burton’s fingers typed:
    #>
    #> I bought a floppy drive with controller off of someone on this list last
    #> year. Sorry, can’t remember who right at the moment. Anyway, I want to
    #> replace the single full-height floppy with 2 half-height units. My first
    #> question is will the power supply in the case support 2 drives? And
    #> secondly, how are the drives setup for the controller? The old drive has
    #> jumpers and uses the cable connector nearest to the computer. I can’t find
    #> any such jumpers on the newer half-height drives. Any help greatly
    #> appreciated…
    #>
    #>
    #> =AF`=B7.=B8=B8.=B7=B4=AF`=B7.=B8=B8.=B7=B4=AF`=B7.=B8=B8.=B7=B4=AF`=B7.=B8=
    #> =B8.=B7=B4=AF
    #> { Just a message from Doug }
    #> { http://www.seidata.com/~gdburton }
    #> =B8=B8.=B7=B4=AF`=B7.=B8=B8.=B7=B4=AF`=B7.=B8=B8.=B7=B4=AF`=B7.=B8=B8.=B7=
    #> =B4=AF`=B7.=B8
    #>

    OK, I assume that since it has a full height drive the power supply
    is sturdy enough to handle two half height drives and I also assume
    that you can mount them in there.

    You can only use low density drives with the CoCo. These are getting
    very hard to find new. The High density 5 1/4″ drives will not
    work. You need to set the jumper for drive 0 to be drive 0 and
    drive 1 as drive 1. The cable should be a straight through
    cable with no pulled teeth or unconnected wires.

    Carl

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  • pucc_unknown

    Date: Thu, 26 Feb 1998 01:07:39 LCL
    Reply-To: Roger Merchberger
    Sender: COCO – Tandy Color Computer List
    From: Roger Merchberger
    Subject: Re: Floppy drive ????

    ;- Clearing the snow from my glasses, I saw Carl Boll – System Operator
    typed:

    snip

    >You can only use low density drives with the CoCo.

    Carl & all,

    I really don’t want to sound like a:

    1 turd,
    2 broken record,
    3 nitpicker,

    but: when speaking of 5.25 / 3.5″ disk drives, there is no such thing as
    *low* density. Yes, this has been beat into dust, but it can give newcomers
    a period of confusion when they go looking for “low density drives” and
    come up empty handed.

    One more time, from the top — a 1, a 2, a 3 and a 4…. ;-

    FM recorded Single Density — this is the lowest density available. The
    CoCo never used this as a standard.

    FM recorded Enhanced Density — this was roughly 1.5x Single density. The
    only systems that used this to my knowledge were the Atari 8-bit machines.

    MFM recorded Double Density — this is what the CoCos have used all their
    life. Big surprise, these disks had the ability to store twice the amount
    of info as the Single Density disks. The first CoCo disk drives were 35
    track single sided double-density Shugart I think floppy drives.

    MFM recorded Quad Density — this IIRC — I’ve never actually owned quad
    density drives is the term used for 96TPI double-density 80-track 5.25″
    720K drives. Again, I’m not totally clear on this one, but I think this is
    right.

    MFM recorded High Density — These are the 1.2Meg IBM 5.25″ floppy drives.
    A few of these drives have the jumper capacity to be downgraded to the Quad
    Density status; otherwise they won’t work on the CoCo to my knowledge.
    For IBM 3.5″ floppies, these are the 1.44Meggers. These will work
    successfully provided: 1 you disable the High density capability of the
    drive either via jumper selection or permanantly enabling the DD switch,
    or 2 use only 720K media to manually enable the DD switch — 1.44Meg
    floppies as a rule — I’m not counting SCSI floppies or using FHL’s
    Eliminator controller which was good for only OS-9 are not possible on the
    CoCo.

    MFM recorded Extra-High Density 3.5″ only — These are the IBMmer 2.88Meg
    floppies. They are fully compatible with the 1.44Meggers, and with 720K
    media can be used on a CoCo, but full 1.44Meg or 2.88Meg capacity is not
    possible with a CoCo.

    Please note: The difference between Single, Enhanced and Double densities
    is a function of the controller, not the drive itself.

    I know — This is not complete or perfect, and changes, corrections,
    additions or embellishments are more than welcome. I hope this helps!

    Roger “Merch” Merchberger

    Roger Merchberger | If at first you don’t succeed,
    Owner, MerchWare | nuclear warhead disarmament should
    zmerch [at] northernway [dot] net | *not* be your first career choice.