Free Download Hss 2.88

I was recently able to get a 2.88MB 3.5" drive for my 486. The drive is a DEC model RX23-AA and it uses the classic 34-pin cable, and I was lucky my motherboard supported it. The media are ED disks are Dysan 100 and I have a NOS pack of five.

One thing that surprised me is that now my DOS machine (MS-DOS 6.22) tries to format every disk as a 2.88MB disk unless I tell it differently. For a 1.44 MB, I had to specify a flag in the FORMAT command. By default, it now tries to do 2.88.

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The first step to converting 2.88 to a fraction is to re-write 2.88 in the form p/q where p and q both are positive integers. To start with, 2.88 can be written as simply 2.88/1 to technically be written as a fraction.

Next, we will count the number of fractional digits after the decimal point in 2.88, which in this case is 2. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 2.88/1 each by 10 to the power of that many digits. For instance, for 0.45, there are 2 fractional digits so we would multiply by 100; or for 0.324, since there are 3 fractional digits, we would multiply by 1000. So, in this case, we will multiply the numerator and denominator of 2.88/1 each by 100:

In order to get some experience with real 2.88MB floppy drives, I have obtained an old internal 2.88MB floppy disk drive, Model MF356F-822MB by Mitsubishi, manufactured May 1997 for IBM Corporation. It also has a sticker on it "IBM FRU 52G3400". The floppy drive has a regular 34-pin floppy drive connector, a power connector with 4 pins and a big blue protruding eject button. I had connected the 2.88MB floppy drive via the regular floppy cable, instead of a 1.44MB floppy drive.

Unfortunately I cannot get the 2.88MB Mitsubishi/IBM floppy drive to work. I had set the BIOS of the Asus P5PE-VM motherboard from 1.44MB to 2.88MB. I had tried the 2.88MB floppy drive on 2 different computers with this dual-core motherboard. The 2.88MB floppy drive powers up ok, is displayed in My Computer under Win98 and WinXP as A:, but it cannot read/write/format 720KB, 1.44MB or 2.88MB diskettes. The old DOS program VGA-Copy v5.30, in a command window under WinXP, could actually go thru the steps of writing/formating a 2.88MB ED diskette, with the drive activity lights correctly flashing, but VGA-Copy only displayed yellow bars for each track, i.e. error encountered.

When I tried to boot into DOS from a 2.88MB ED boot floppy, the 2.88MB floppy drive was accessed and its green activity light lit up, but after about 10 seconds the System Commander operating systems selection menu came up instead of DOS, i.e. something went wrong while trying to boot from the 2.88MB boot floppy..

What am I doing wrong? Does this 2.88MB drive require some special tricks for connecting? Or is this 2.88MB drive just bad? Is there a chance to fix this drive? Or is the BIOS of the Asus P5PE-VM not compatible with 2.88MB floppy drives, even if it has a 2.88MB selection? I don't have another 2.88MB floppy drive to compare.

It looks like the 2.88MB floppy drive has finally died. When I powered up the computer with the power supply cable connected to the 2.88MB floppy drive, the computer immediately shut down; when I powered on without the 2.88MB floppy drive connected, the computer started up fine.

The 2.88MB floppy drive apparently requires a custom-made floppy cable to work with my motherboard, different from the standard floppy cable. The pin-out of 2 different IBM 2.88MB drives (PC 700 Series and PS/2) is at ://servicepac.mainz.ibm.com/eprmhtml/eprm/h266.htm

That said, I have no specific knowledge of 2.88M drives. I see however from those pinouts, that pin 33 has joined pin 2 in selecting the drive density, which makes sense, as there are now at least three densities to support. It is possible that this additional density select line is similarly inverted (in the PS/2 range, as compared to the industry standard).

A company in Georgia in the U. S., Coventry West, sells both 3.058 and 2.88 differentials, but I suspect the shipping to The Netherlands would be frightening. For reference I shipped a differential from Arkansas to Las Vegas a year or so ago and the shipping cost was about $100, IIRC. The differential in the wooden crate I constructed weighed about 120 lbs., again, IIRC.

my 78 XJS had 3.07 in the LSD Powerlok, i changed to 3.73 ratio , BUT added an Overdrive trans, at same time, gives me 2.60 -1 on hiway cruise, better than 2.88!

and accelleration is fantastic , with low 1st and 2nd,3rd, 4th is overdrive!

the ring/pinion were for a JEEP, fit perfect, still in the rear end, with LSD!

ron

With the ENV diff you have basically only two ratios to choose from (unless you go the other way to better acceleration and higher revs when cruising). They are 3.64 (standard) and 3.27. There are a lot more choices with the Salisbury: 2.45, 2.88, 3.07, 3.31, 3.54, etc). Not all of these are so easy to find, however.

My early 120 OTS now has the 3.27 ENV, and cruises at about 3000 at 70mph. With the 3.64 I had to use about 3500 to cruise at 70mph. The engine is a bog-standard 3.4, except for an XK150 B-Type head, 8:1, and 16" wheels with Michelin X tyres. It is quite happy tootling around town at 30mph or even 20mph in 3rd, even with the 3.27.

I would imagine the bigger, torquier 4.2 would happily pull a 3.07, or even a 2.88. I believe a lot of E-Types used the 3.07, though they were running on 15" wheels, not 16".

Once again I seem to remember a side discussion in a past post that mentioned

the possibility of faking a ps/2 with a 2.88mb floppy drive into thinking a

1.44mb disk was really a 2.88 disk. I think it was Peter W.? who said there was something different about the

holes on the disks.Does anyone know what to do or better yet has anyone actually done it? I'd

like to try the 2.88 linux boot floppy that was posted here a couple days ago

but I need the 2.88 floppy first. The 1.44 disk doesn't seem to work.CAN IT BE DONE ????Thanks for the help!Glen -on my spiffy 9577sPS. That linux boot disk was at:

called: bigbroot.img and there is also a bigbroot.txtI tried using rawrite2 from dos to copy it to the 1.44mb floppy. I also had to

use ftp to download, the browser couldn't find it, but maybe that's just AOL.

2.88 within the same space as a 1.44 calls for a higher track density. As

far as I recall, they achieved this by using a different orientation of the

magnetical polarity, compared with standard 1.44. The standard magnetical

material on 1.44's is not well suited for the different polar orientation.

The special 2.88's was manufactured with a different kind of magnetical

material, suited for the different way to record the data. Like different

materials are used on VHS tape than on ordinary audio tape. The original

2.88 diskettes are hard to come by, and costs a lot.

Never the less, it is possible to fool the drive to believe, that a 1.44

diskette is a 2.88, holes, notches or what have you.

From a DOSprompt issue the command FORMAT A: /U /F:2880

Because of the different magnetizing technique, not pallable to normal

diskettes, don't use a cheap one. Choose a fresh high quality diskette.

It works on my 9576i

The only 2.88MB floppy equipped machines I've got here are models 8535,

8557 and 9556. They'll all format an HD floppy to 2.88MB under DOS by

using the command format a: /u /f:2.88(I've found them to be reliable, though I only use it as a quick way of

getting data from one machine to another. For important stuff, I've a

(limited, unfortunately) supply of _free_ ED disks:)Interestingly, MS-DOS5/6/7 have problems re-formatting these disks to

1.44MB, though Caldera DR-DOS (my preferred DOS atm) doesn't seem to

mind).(Maybe that says something about Micro$oft's "format" ?)regards,

Ian Cummings

??? I'm not responsible for *everything* going on in this NG. .... ;-)To differ the disks:- DD = 720K / 2 x 80 tracks, 9 sectors per track with 512 bytes per sector.

No hole at the right side (Left side: WP-slide of course)

Base material is FeO2 (Ferro-Oxide)- HD = 1.44MB / 2 x 80 tracks, 18 sectors per track with 512 bytes per sector

A hole in the same height than that of the WP-slide

Base material is FeCr (Ferro-chrome)- XD = 2.88MB / 2 x 80 tracks, 18 sectors per track with 1024 bytes per sector

A hole of same size as on HD but with 5 mm offset away from the lower edge.

Base material mainly FeCr but similar to video-tape (different coercitivity /

magnetic saturation). The XD-standard however knows a different layout with 2 x 80 tracks 36

sectors per track and 512 bytes per sector again. The total number of

user-available bytes and the data-density are (almost) the same - but due to

the higher number of sectors the data-overhead is a bit higher than on the 18

sector / 1024 bytes solution. The XD-floppies are pretty expensive - and therefore sold rather poor, which

didn't make the prices fall.The HD-floppies should not be used with 2.88-format. It might work, but the

"write current" in 2.88MB-format is different (lower) than on the 1.44MB format

and therefore the written data-bits might be a bit insecure. It is a similar

reason why you should not format a 1.44MB-disk to 720KB and other way round:

the different media takes the magnetization in a different way and cannot be

reformatted with the proper format in the worst case. I'd accidently destroyed

some 1.44MB-floppies with formatting them to 2.88 - and they choked later with

a "Track 0 bad or unusable" error on the attempt to re-format them.Very friendly greetings from Peter in Germany

I apologise for starting this thread. The original poster was trying to

install my BigBroot 2.88meg 1-floppy Linux, and I had assumed rawrite

did 2.88 . I am mortified.Fortunately, the required tweak of rawrite was trivial, and worked

the first time on a windog C compiler I was able to beg the services of

from the gracious Mark Vitnell on the other side of the planet from me.

The result of that global compile, raw288, is in Incoming with

BigBroot and an embarrassing sequence of related .txt files.

/glycerine.itsmm.uni.edu I was able to make a 2.88 image with raw288 after using the aformentioned

format a: /f:2.88 .The tweak needed was to add

36,

to the array that tries various sector-per-track values to figure out the

capacity. If you have a windog C compiler, rawrite is ripe for an upgrade.

raw288 is just an emergency measure.BigBroot, BTW, needs about a 6 meg ramdisk, which required an equally

trivial tweak of the Linux kernel. BigBroot is a rather cushy

demo/rescue/install type disk, with Pico,

a spreadsheet, ethernet stuff, and the feature-rich

Bourne-type shell, GNU Bash.

Oh. And the first vestiges of some documentation.Halloween is approaching. If you're around a bunch of PS2's keep a copy of

BigBroot handy for giving people white hair.I'm working on a umsdos version now, which won't be PS2-specific, and will have

the first vestiges of a Lynx-based UI/documentation system.

Thanks to the glycerine people for the use of thier Incoming.

Rick Hohensee ~humbubba

colorg on EFnet IRC #linux chanop

Forth C Linux Perl graphics music Md., USA

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