Sorry you'll notice also on the lower half of the front is an aluminium cover
that detaches with a couple of screws, revealing another card with additional
labelling on it. Also have a look around the inside of the case. Any of those
thin, printed strips are where you'll likely find one (or more
Hi Paul,
Actually I've got a couple of these units, and as Bruce has indicated yes
they're a Data General manufactured product. (Bruce is the one with vastly more
DG knowledge than myself).
Mine is a '6098', which is really an integrated combination of fixed disk
drive, floppy disk drive and con
Do note that Fred last line can be important.
If you take a disk that is a 96 tpi and write something on a clean disk, you
should be able to take it to a 360k drive and read it. If the disk was use ona
360k machine and you over write anything that was previously on it, it will
unlikely read on a
Converting drive:
SOME 96tpi drives had a jumper to make them always double step
SOME 2 speed drives had a jumper to force one speed.
SO, it couldbe jumpered into a 360K, other than the heads being too narrow
Dropbox works for this kinda stuff.
Sent from my iPhone
> On Oct 28, 2024, at 12:17, jake utley via cctalk
> wrote:
>
> So it looks like I can’t upload to archive.org for a bit of time but I’ll
> have a look and see if I can put it somewhere I can share.
> Sent from my iPhone
>
>>> On 27 Oc
Track width
360K drives (40 track) have tracks 48 tpi. (Early on, Shugart SA400, and
Apple SA390, only used 35 of those tracks) That's about 1/2 mm from
center of one track to center of the next. The track itself is about
1/3 mm wide, leaving a little blank space between tracks.
80 track (b
So it looks like I can’t upload to archive.org for a bit of time but I’ll have
a look and see if I can put it somewhere I can share.
Sent from my iPhone
> On 27 Oct 2024, at 21:52, Holm Tiffe via cctalk wrote:
>
> Please drop me a line if you do that..
>
> THX,
> Holm
>
> jake utley via cct
On Mon, 28 Oct 2024, Fred Cisin via cctalk wrote:
Converting drive: (NOT PEACTICAL!)
1) Disk controllers intended for 360K generally run 250K bits per second
(125K for single density), and do NOT support the 300K bps and 500K bps
that are needed.
Weltec sold some drives with a VERY bizarre w
I'll have to answer some other questions later, . . .
Diskettes:
For writing 10K/180K/320K/360K disks, use THOSE, never 1.2M dikettes!
"360K" diskettes are 300 Oersted; 1.2M are 600 Oersted.
The 1.2M/600-Oersted dikettes use a reduced write current (pin6? of the
interface)
Twiggy disks, and A
On Mon, 28 Oct 2024, Steve Lewis wrote:
That is because you are writing "320K" disk in a 1.2M drive.
double step is to get 40 tracks instead of 80
Makes sense, thanks. I wasn't 100% sure if this was a 1.2M drive or not.
How difficult is it to change a drive? And could it go the other way,
up
> That is because you are writing "320K" disk in a 1.2M drive.
> double step is to get 40 tracks instead of 80
Makes sense, thanks. I wasn't 100% sure if this was a 1.2M drive or not.
How difficult is it to change a drive? And could it go the other way,
upping a 360K stock drive to support 1.2M
Steve,
great to hear that you now can use the external drive and boot from it !
Actually the MS-DOS diskette and manual is in a huge hard cover binder
including full documentation of MS-DOS and the Microsoft Macro assembler.
I guess this are 250+ pages and no plans to scan it.
The image was
Thanks Bruce. Data General actually went into the 14" drive manufacturing
business, platters, heads, positioner, spindle, and all? I've been assuming
that they sourced the drive assembly OEM and then built their finished product
around that.
Yes, the associated 8" FDD is DSDD so "quad"; manuf
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