20 Aug
2021
20 Aug
'21
8:58 p.m.
Is there a simh for the otrona attache? I have some.disk images created
with Dunfield's utility..if not I will try to read them by using the Zorba
portable, which is pretty good with varied formats.
Bill
20 Aug
20 Aug
9:08 p.m.
On Fri, 20 Aug 2021, Bill Degnan via cctech wrote:
Is there a simh for the otrona attache? I have
some.disk images created
with Dunfield's utility..if not I will try to read them by using the Zorba
portable, which is pretty good with varied formats.
Bill
Otrona is fairly straightforward for format conversion.
CP/M and MS-DOS. There might have been other operating systems for them,
but I didn't run into any.
They had 40 track and 80 track drives.
512 bytes per sector, so they can be done using Int13h, without even
needing Int1Eh.
10 sectors per track; inter-sector gaps were tight but not unreasonable.
I don't remember whether they were numbered 0 - 9 or 1 - 10
24 Aug
24 Aug
3:22 p.m.
Fred,
Just for the purpose of imaging the disks, is there any reason I cant treat
these disks like any other 5 1/4" cpm 360k disk?
Bill
On Fri, Aug 20, 2021, 9:09 PM Fred Cisin via cctech <cctech at classiccmp.org>
wrote:
On Fri, 20 Aug 2021, Bill Degnan via cctech wrote:
Is there a simh for the otrona attache? I have
some.disk images created
with Dunfield's utility..if not I will try to read them by using the
Zorba
portable, which is pretty good with varied
formats.
Bill
Otrona is fairly straightforward for format conversion.
CP/M and MS-DOS. There might have been other operating systems for them,
but I didn't run into any.
They had 40 track and 80 track drives.
512 bytes per sector, so they can be done using Int13h, without even
needing Int1Eh.
10 sectors per track; inter-sector gaps were tight but not unreasonable.
I don't remember whether they were numbered 0 - 9 or 1 - 10
4:07 p.m.
On Tue, 24 Aug 2021, Bill Degnan wrote:
Fred,
Just for the purpose of imaging the disks, is there any reason I cant treat
these disks like any other 5 1/4" cpm 360k disk?
Bill
Treat them just like any other 5.25" MFM CP/M disk.
IIRC, the 48TPI ones are 400K, with 512 bytes per sector, 10 sectors per
track.
The 96tpi ones are 800K, and should be treated like any other "Quad
Density" CP/M disk.
They also had a 96tpi MS-DOS format. Same thing, but obviously, with an
MS-DOS, rather than CP/M file system.
For those who may not remember the Otrona Attache, it was smaller and
lighter than the other luggables.
They had an advertisement with a Charlie Chaplin look-alike, comparing
carrying it VS a 5150 (on a card table) down a broad set of stairs (in
front of a capitol building?). IBM had been using the "Little Tramp" in
their advertising, and asserted OWNERSHIP of the Charlie Chaplin "Little
Tramp" character and image, and made them cease and desist. I can't find
an image, nor even a mention, with GOOGLE.
--
Grumpy Ol' Fred cisin at xenosoft.com
4:14 p.m.
On Tue, 24 Aug 2021, Fred Cisin via cctech wrote:
The 96tpi ones are 800K, and should be treated like
any other "Quad Density"
CP/M disk.
Just for my own curiosity, can a "typical" high-density 5.25" drive
correctly image a 96tpi disk?
Thanks Fred!
g.
--
Proud owner of F-15C 80-0007
http://www.f15sim.com - The only one of its kind.
http://www.diy-cockpits.org/coll - Go Collimated or Go Home.
Some people collect things for a hobby. Geeks collect hobbies.
ScarletDME - The red hot Data Management Environment
A Multi-Value database for the masses, not the classes.
http://scarlet.deltasoft.com - Get it _today_!
4:30 p.m.
> The 96tpi ones are 800K, and should be treated
like any other "Quad
> Density" CP/M disk.
On Tue, 24 Aug 2021, geneb via cctech wrote:
Just for my own curiosity, can a "typical"
high-density 5.25" drive correctly
image a 96tpi disk?
USUALLY.
Either the drive needs to be able to switch to 300 RPM,
OR the FDC needs to support 300bit per second data transfer rate,
(same as what was required for routine reading of 360K disks in the 1.2M
drive.)
BUT, it needs to NOT automagically engage a double-step "feature".
One of my primary test machines was a "REAL" 5170.
It worked OK for "720K" 96tpi disks (what some companies called "quad
density")
'Course, use of a 5150/5160 with a "low density" 96tpi drive, such as
Shugart/Panasonic/Matsushita 465, Mitsubishi 4853, Teac 55F, Tandon
TM100-4, or similar avoids that particular potential (but not common) BIOS
issue.
2 Sep
2 Sep
11:52 a.m.
I have an Otrona Attache disk, I've imaged using Dunfield's Image Disk
program:
https://www.vintagecomputer.net/disk_images/ATTACHE/015.IMD
If there is interest, please download and create a disk and try to use the
disk on your Attache or MAME emulating an Otrona Attache. Let me know if
you run into any problems. I am not sure if this particular disk image
results in a bootable disk or if it's a data disk (WordStar files).
Bill
On Fri, Aug 20, 2021 at 9:09 PM Fred Cisin via cctech <cctech at classiccmp.org>
wrote:
On Fri, 20 Aug 2021, Bill Degnan via cctech wrote:
Is there a simh for the otrona attache? I have
some.disk images created
with Dunfield's utility..if not I will try to read them by using the
Zorba
portable, which is pretty good with varied
formats.
Bill
Otrona is fairly straightforward for format conversion.
CP/M and MS-DOS. There might have been other operating systems for them,
but I didn't run into any.
They had 40 track and 80 track drives.
512 bytes per sector, so they can be done using Int13h, without even
needing Int1Eh.
10 sectors per track; inter-sector gaps were tight but not unreasonable.
I don't remember whether they were numbered 0 - 9 or 1 - 10
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billdegnan＠gmail.com -
cisin＠xenosoft.com -
geneb＠deltasoft.com