Re: IBM 5.25 fdd

Ok from what I have been able to discern from the replies, toss the
SOB you ain't got a machine it will work in even if you can find the
drivers.

The only ray of hope is that this FDD has 2 buttons (and a light) on
the front. No switch on the side.and it is a 5.25 FDD.
Hence it's ability to use 2.88 disks is irrrevalent unless use of it
is in a package that comes in a BIOS recognizing
2.88 FDDs.

I quite frankly don't give a rat's ass about some internal command to
lockit,etc,etc, etc. I would just appreciate it if someone could
please tell me if it could be used by, and a 5.25 disk ejected by one
of those buttons "with appropriate cabling" my 8590, or in any other
of my MCA boxes. IIRC the 8557 and the 8570 (?) had a BIOS permitting
2.88 fdds. (As did the NEXT). Or if it would even function in a non-
MCA IBM or Dos-box just using the eject button manually.

Don't mean to be rude but the technical obfuscation I've run into with
this drive is making me even more nutso-er than usual. Of course the
simplest method is to just try it in a computer and if it works, it
works.

Lawrence

On Mar 30, 8:02 am, Louis Ohland <ohl...@xxxxxxxxxxx> wrote:
Oh, fluck. Intel moved their documents. Surprise!



Louis Ohland wrote:
Some clarification is in order.

RickE is correct - the rule of thumb is that a system must support the
2.88MB drive size for it to even be POSSIBLE to support the Electronic
Eject function of the 5.25 (or 3.5) floppy.

http://www.gilanet.com/ohlandl/floppy/floppy.html#EE_Floppy_Switch

The 82077SL FDC supports EE. The AA most likely does not. If you wandt
to use the EE as EE, czech your FDC. 82077SL is holy joy, all others may
be the deceiver.

There is no 2.88MB 5.25" floppy. It does 1.2MB/360K only.

 From David Beem
    Here is the listing of 82077xx FDC chips that are able to support
the 2.88 EHD drives:

FDC Location:          Processor:                     FDC
35SX Planar #1          Intel 386SX-20              82077AA
35SX Planar #2          Intel 386SX-20              82077AA
53 486SLC2 Planar       IBM 486SLC2-50              82077SL-1
56SLC Planar            IBM 386SLC-20               82077AA
57 486SLC2 Planar       IBM 486SLC2-50              82077SL
77 (Bemuda) Planar #1   Upgrade Intel 486DX2-66     NS8477-AV
77 (Bemuda) Planar #2   Upgrade Cyrix 486DX2-75     82077AA
77 (Lacuna) Planar      Upgrade 83MHz POD           82077SL
Reply 80 Planar         Upgrade 83MHz POD           82077SL
85 (X, K, N) Planar     i486SX-33, DX2-66           82077SL (1)
95 (K-M) Planar         Type 1-Type 3 complex       82077AA (2)
95 (N-Q) Planar         Type 4 Complex              82077SL (3)

1 Ed. All models support the 3.5" Electronic Eject floppy drive. (and
2.88!!)
2 Ed.  Known to support 2.88 Note:  early 8595s do not support the
2.88MB floppy
3 Ed.  All N-Q  support the EE floppy (and 2.88!!)

    One pattern seems to emerge from the PS/2 planars: the "souped-up"
or second-gen planars have the 82077SL FDC chips. A couple of surprises
though. I did find two other FDC chips on my equipment. The first on
Bermuda planar #1 is a National Semiconductor 8477AV-2 chip *without*
the "(C) NEC 1979", but with "(C) NSC 1991". Probably a 82077AA
replacement that is reverse enginered enough to avoid having to use the
NEC copyright. That system is unchanged from the way I bought it, with
an "*" 2.88 drive. The spare 2.88 I got on eBay I am unsure of the
original model is a non-"*" drive.
    There is a smaller surface mount Intel 82091AA in my HP NetServer
that does bear the "(C) NEC'79" & also "(C) Intel '86 '93". Just a guess
again about being a replacement for the 82077AA with the end of the part
number. All the Intel 82077AA and 82077SL chips I have otherwise have
"(C) NEC 1979" & "(C) Intel '86 '91" of course. Other clone motherboards
and adapter cards I have don't look like they have a stand-alone FDC
chip. Most support the EHD drives in the BIOS, so it has to be a variant
of the 82077xx somehow (Even the enhanced NEC 72065B doesn't support
2.88 drives.).
    FDC chips are supposed to give which level they are by a "ver"
command given to the chip. By my reference all flavors of the 82077
return the same value. I have tried a routine for the FDC ver command
that so far has *not* worked. The PS/2 35SX and 53 486SLC2 planars both
give a return value for a standard FDC that doesn't support 2.88 drives,
then make the computer unable
to read the drive! Here is the (of all things, BASIC) routine anyway & I
am going to keep trying to get it to work.

OLDVAL = INP(&H3F5)
OUT &H3F5, &H10
FDCVER = INP(&H3F5)
FDC = ""
IF FDCVER = &H80 THEN FDC = "NEC 765 / Intel 8272 or compatible FDC, no
2.88 support"
IF FDCVER = &H81 THEN FDC = "Intel 82077xx or compatible FDC, 2.88 support"
IF FDCVER = &H90 THEN FDC = "NEC 72065B or compatible FDC, no 2.88 support"
IF FDC = "" THEN FDC = "Unknown FDC returning value " + HEX$(FDCVER) + "h"
PRINT FDC
OUT &H3F5, OLDVAL

llittle muddy wrote:
On Mar 28, 6:24 am, RickE <ekb...@xxxxxxxxxxxx> wrote:
On Mar 28, 2:14 am, llittle muddy <lawrencewa...@xxxxxxxxx> wrote:

IBM FRU64F4102. It has an IDE connector and 2 buttons on the front.
No, not IDE, that's a "standard" floppy connector.  It is an
electronic eject drive, and was most commonly used in the 9590 or 9595
machines, but with the appropriate cable it could be used in other
models as well.

Do I need a special card ?
No, you need the appropriate cable, a machine with a suitable floppy
drive controller (general rule -- if it supports a 2.88MB 3.5-inch
drive, it will also support the 64F4102), and space to plug it in.

Rick Ekblaw

 OK I dug a cable out of my ribbon cable box, it fit, and
automatically
assumed it was an IDE cable. I was obviously mistaken. It is a 5 1/4
drive. I've never heard of a 2.88 5 1/4 floppy so it obviously
interprets
the different size of the disk, unless I'm misunderstanding something.
I've used HD 3.5 disks on IBM 2.88 controllers with no problems.
Does that mean it will read 360 k disks or only HD 5.25 floppies ?

From what you are saying it would work with my 8570. Would it also
work
with my 8590 (without checking out the specs of it on google). Was
there
anything in the OS/2 BIOS which determined it's floppy size or was
that in
the electronics of the FDD

Thanks, Lawrence- Hide quoted text -

- Show quoted text -

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