It might be a pain, but if you have a chance to take a picture of the jumpers on the board, I d be interested to see what you have. I just did a set ofMessage 1 of 40 , Nov 14, 2012View SourceIt might be a pain, but if you have a chance to take a picture of the
jumpers on the board, I'd be interested to see what you have. I just did a
set of SA800's from an Intel MDS. I expect yours to be completely
-------- Original Message --------
> From: "Rich Cini" <rich.cini@...><email@example.com>
> Sent: Wednesday, November 14, 2012 8:53 AM
> To: "firstname.lastname@example.org"
> Subject: Re: [midatlanticretro] Lobo floppy drivesdismounted the drives yet or plugged it in. That's tonight.
> Great, thanks. I have those manuals somewhere at home. I haven't
> Rich Cini
> Sent from my iPhone
> On Nov 14, 2012, at 7:58 AM, "B. Degnan" <billdeg@...> wrote:
> > Yup. Shugart 800 or 801s.
> > -------- Original Message --------
> > > From: "Rich Cini" <rich.cini@...>
> > > Sent: Wednesday, November 14, 2012 7:48 AM
> > > To: "email@example.com"
> > <firstname.lastname@example.org>
> > > Subject: Re: [midatlanticretro] Lobo floppy drives
> > >
> > > Thanks Bill. Look at ebay 190743958928. There are quite a few pics
> > >
> > >
> > > Rich Cini
> > > Sent from my iPhone
> > >
> > >
> > > On Nov 13, 2012, at 10:19 PM, B Degnan <billdeg@...> wrote:
> > >
> > > > My guess...I believe SA800 clones specific/jumpered to the oem it
> > sold to clone. Pics?
> > > > --
> > > > Sent from my PDP 8/e.
> > > >
> > > >
... Here s the service manual for the Tandom TM-848, with the schematics in the back: http://bitsavers.trailing-edge.com/pdf/tandon/TM848_service_1982.pdfMessage 40 of 40 , Dec 15 8:13 AMView SourceOn Sat, 15 Dec 2012, joshbensadon wrote:
> --- In email@example.com, Mike Loewen <mloewen@...> wrote:Here's the service manual for the Tandom TM-848, with the schematics in
>> The double-sided drives have a 2S signal on pin 10 of the interface
>> connector to indicate single or double-sided media. The outputs of the
>> respective pulse-shaping ciruitry for each sensor is essentially ORed to
>> form a single Index pulse output.
> Cool, so I can imagine the two sensor signals going to an RS flip flop
> to provide the 2S signal and as you said to an OR gate for the index.
Knock yourself out. :-)
> Hmm, thinking about why, I guess the design was to create a hardwareThe 5.25" drives only had a single index hole aperture.
> error if a user placed a DS disk into a SS drive. As Rich found, the
> lack of index pulses caused a drive not ready. Correct me if I'm wrong,
> but in later 5.25" drives, they did not change the index sensor
> location. Then I suppose the errors created would be software
> I vaguely remember hearing a discussion about how computers switchedI couldn't say. Certainly Woz did a lot in software for his Apple II
> from hardware solutions to software solutions, then back to hardware.
> I just don't know the dates, could this 8" to 5.25" be part of that
disk controller design. Another odd thing about the 8" drivers vs the
5-1/4" drives was that the 8" drives had a write-enable notch, while the
5-1/4: drives had a write-protect notch. Very confusing.
Mike Loewen mloewen@...
Old Technology http://sturgeon.css.psu.edu/~mloewen/Oldtech/