Re: Archiving otrona attache disks
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 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 > >
Re: Archiving otrona attache disks
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.
Re: Archiving otrona attache disks
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_!
Re: Archiving otrona attache disks
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 ci...@xenosoft.com
Re: Archiving otrona attache disks
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 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 > >
Re: Archiving otrona attache disks
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
Archiving otrona attache disks
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
