I too worked for DDC many moons ago when they were at 8650 Balboa (Now Raytheon). Most of the drives were low volume production (1 to 10 units) for specific harsh environments (power plants, etc.) based upon several basic designs. Each type depended on a hardware controller designed by a graybeard out of Rancho Palos Verde (Chuck Williams I believe), who steadfastly refused to get involved with those new-fangled microprocessors (Motorola 6800, and 68000 days). Some of his later designs were, however, were essentially based on MSI TTL equivalents of a rudimentary microprocessor. Documentation consisted of essentially a logic diagram and a series of diagrams defining specific formatting and timing of the drive. There was some other generic documentation, but it was pretty much only available to the field service and training types. For years I had some of this documentation, but trashed it years ago since the equipment was so archaic. If anyone knows a Dale Carney (lived in Santee, ran a donut shop or two, and bicycled to work every day at the time) there is a slim chance he may still have some of digital side docs. Since he did the analog hardware design, it is unlikely though.
The upshot of all this is that what you want/need is probably no longer in existence. If you are, or know a digital hardware type with many hours, he could reverse engineer the controller to determine the formatting. ---- Carl Lowenstein <[EMAIL PROTECTED]> wrote: > On 6/12/07, Karl Cunningham <[EMAIL PROTECTED]> wrote: > > On 6/9/2007 5:01 PM, Carl Lowenstein wrote: > > > All right, somebody who was at the Technical Bookstore InstallFest > > > last week was familiar with DDC drums. Who, when, or is my memory > > > acting up on me? > > > > > > > > > > Got an answer back from Jack. He left DDC 32 years ago and said he > > doesn't remember much of anything about specific models. He did say the > > connector pinout was almost always the same, except for specials. > > > > He also mentioned this: > > Computer Museum of America > > 640 C Street > > San Diego, Ca 92101 > > Phone: (619) 619-235-8222 > > > > Supposedly they have some DDC disks and might know something about them. > > Sorry it wasn't more help. > > > > Computer Museum of America has moved several times over the years. > >From Grossmont College to C Street to ?? to San Diego State. > > < http://www.computer-museum.org/ > > > I visited them back when they were at Grossmont and again at C Street. > They had a DDC drum but didn't particularly know what it was. Just a > piece of unknown hardware on display. > > carl > -- > carl lowenstein marine physical lab u.c. san diego > [EMAIL PROTECTED] > > > -- > [email protected] > http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list -- [email protected] http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list
