test-drb October 2001

test-drb@ccmp.vtda.org

259 participants
770 discussions

ArcNet and the Pursuit of Multiple Topologies

by dhquebbeman＠theestopinalgroup.com

> Now I'm thinking that the "T" in "10BaseT", "100BaseT4", etc. and the T in > the line capacities "T-1", "T-2", etc. are the same thing. > Is that true? I thought the 'T' in 'T1' stood for "trunk", as in trunk line... -dq

22 years, 8 months

IBM unit record (punched card, tabulating machine) docs

by mhstein＠usa.net

Some real vintage (although "computer" would be stretching it) docs looking for a GOOD home: IBM 402/403 & associated peripherals manuals & some schematics. mike

22 years, 8 months

looking for documentation for 1963 minuteman missile computer

by jtinker＠coin.org

I'm looking for documentation for a 1963 minuteman missile navigation computer. Any leads would be appreciated. Thanks, John Tinker

22 years, 8 months

IIgs using hard disk 20

by SUPRDAVE＠aol.com

In a message dated 10/15/01 10:41:05 PM Eastern Daylight Time, mythtech(a)Mac.com writes: << There are two different products with the name Hard Disk 20. One is the Apple Hard Disk 20 SC and it is a SCSI device. There were also 40, 80 and I think 160 mb versions (and maybe others in larger sizes). BUT... predating that was a "Macintosh Hard Disk 20" that was not scsi. Rather is was some drive (don't know what kind, but MFM seems sensible enough) that used a special adaptor board that enabled it to plug into the disk drive port on a bunch of the older macs. It was all enclosed (drive, power supply, adaptor board) in one nice zero footprint beige case (back when beige meant brown, and not grey like "beige" computers of today). They are two totally different drives, sold at two different time periods (although, I do believe they overlapped for a while, until the SCSI version completely replaced the disk drive version). -chris >> I have a couple of those hard disk 20s that still work, one was recovered >from a trash bin with a professor's work still intact! I have a mac128, but has an aftermarket board in it that upgrades it to a plus class machine, but I do know it works just fine with the 512k models I have. even though it's 20 meg, disk access is only about as fast as the floppy drive. -- DB Young Team OS/2 old computers, hot rod pinto, barbie's rocket motorhome and more at: www.nothingtodo.org

22 years, 8 months

IIgs using hard disk 20

by mythtech＠Mac.com

>> was designed to work with older non scsi macs (128k 512k), and could be >> daisy chained thru the disk drive ports > >Are you SURE? I have an HD20 which works just fine on a Plus, but which I >have NEVER been able to make work on a 128k. My 512k has video problems >and I haven't had a chance to sort those out so I can test the HD20 on it. I was almost 100% positive that I once had it working on a 128k, but a search of apple's TIL shows that the HD20 works with the 512ke, Plus, SE, Classic, IIci, and Portable... so I guess I never took it lower than my Plus (I never owned either of the 512's). This is going to be a head scratcher for me for some time... I distinctly remember hooking it up to my 128. (I can picture sitting in front of the table working on it... I guess I must have failed in my attempts, but I could have sworn I was successful) -chris <http://www.mythtech.net>

22 years, 8 months

IIgs using hard disk 20

by mythtech＠Mac.com

>I think I've got an old Hard Disk 20 and it's a SCSI device. I'll have to >find >the lid to see what it says on it, though. It seems to me that it's an >old MFM >drive with a customed up SCSI bridge adapter on it. There are two different products with the name Hard Disk 20. One is the Apple Hard Disk 20 SC and it is a SCSI device. There were also 40, 80 and I think 160 mb versions (and maybe others in larger sizes). BUT... predating that was a "Macintosh Hard Disk 20" that was not scsi. Rather is was some drive (don't know what kind, but MFM seems sensible enough) that used a special adaptor board that enabled it to plug into the disk drive port on a bunch of the older macs. It was all enclosed (drive, power supply, adaptor board) in one nice zero footprint beige case (back when beige meant brown, and not grey like "beige" computers of today). They are two totally different drives, sold at two different time periods (although, I do believe they overlapped for a while, until the SCSI version completely replaced the disk drive version). -chris <http://www.mythtech.net>

22 years, 8 months

Rescue / Sale in AZ: PET, Tandy, Apple, PC

by bigfish＠bluefrognet.net

I am interested in the 3m thermofaxes. are they still avail? I will contribute$$$$$$$. please advise, Gordon Link

22 years, 8 months

looking for documentation for 1963 minuteman missile computer

by Innfogra＠aol.com

I have seen the boards out of one of the minutemen missile computers. IIRC they are very interesting Boards composed of discrete components. Anyone who has a full computer is very lucky. I would consider it to be an extremely rare collectable. The Boards that I saw were about 4"X6" and heavily plated in gold then lacquered. They are very pretty. I would love to see a whole computer. Paxton Astoria, OR

22 years, 8 months

IIgs using hard disk 20

by healyzh＠aracnet.com

I don't think the one that he's talking about is SCSI, it plugs directly into the floppy port on a Mac 128k or Mac 512K. ISTR, using one on a newer Mac Plus instead of a SCSI drive as I needed something of that formfactor and that was all I could get my hands on at the time. Based on how it's used, I'm guessing you're right about it being a MFM drive, but I suspect it's some wierd sort of bridge in it. Zane > I think I've got an old Hard Disk 20 and it's a SCSI device. I'll have to find > the lid to see what it says on it, though. It seems to me that it's an old MFM > drive with a customed up SCSI bridge adapter on it. > > Dick > > ----- Original Message ----- > From: "Chris" <mythtech(a)Mac.com> > To: "Classic Computer" <classiccmp(a)classiccmp.org> > Sent: Monday, October 15, 2001 2:39 PM > Subject: IIgs using hard disk 20 > > > > Does anyone know if an Apple IIgs can use an old Macintosh Hard Disk 20. > > The Mac HD is NOT scsi, but rather uses the disk drive port on a Mac. It > > was designed to work with older non scsi macs (128k 512k), and could be > > daisy chained thru the disk drive ports (at one point, I think I had 3 HD > > 20s and a 400k drive connected to my 128k Mac). > > > > The IIgs has a disk drive port, and visually, the 3.5" drive I have for > > it looks just like the 3.5" drive I have off an old Mac Classic (I have > > to go off visual, as the one from the Classic has no labels or other > > markers beyond the apple logo... don't know why, that is the way it was > > when it was given to me). > > > > I was hoping maybe they used the same ports, and I might be able to use > > the HD 20 with my IIgs so I can add a hard drive to it. > > > > Anyone info would be great. > > > > > > > > -chris > > > > <http://www.mythtech.net> > > > > >

22 years, 8 months

looking for documentation for 1963 minuteman missile computer

by cmurillo＠emtelsa.multi.net.co

Rocket science is in the rocket engine. Navigation is not that hard, comparatively... At 03:12 PM 10/15/01 -0400, you wrote: >Let's hope they're all bought up by domestic hobbyists... > >;-) > >-dq -------------------------------------------------------------- Carlos E. Murillo-Sanchez carlos_murillo(a)nospammers.ieee.org

22 years, 8 months

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test-drb October 2001