test-drb May 2005

test-drb@ccmp.vtda.org

248 participants
723 discussions

data stored in moving rust, was Re: Remembering RAMAC

by aek＠bitsavers.org

> From HIGH SPEED COMPUTING DEVICES, ERA Inc, 1950: > The whole book actually reeks of vapor. Um... ERA were the people who built the "Project 13" machines during WW II. The 1101 used a drum, and built the follow on 11xx machines in the Twin Cites. ref "A Few Good Men From Univac" "From Dits To Bits", etc. WISC was designed around he same time, and used a drum.

19 years, 1 month

Rack 'L' bracket kits on eBay

by aek＠bitsavers.org

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5776257783 These are REALLY handy if you have J random piece of gear to put in a rack (like a DEC H960 with front and back rails) and it wasn't built for rack slides. The price is for two pair.

19 years, 1 month

Bristol spline sets

by aek＠bitsavers.org

http://www.mgs4u.com/Bristol-spline-L-keys.htm is the first of hundreds of Google hits.

19 years, 1 month

"Task 13"

by aek＠bitsavers.org

So much for my memory.. Um... ERA were the people who built the "Project 13" machines during WW II. The 1101 used a drum, and built the follow on 11xx machines in the Twin Cites. ref "A Few Good Men From Univac" "From Dits To Bits", etc. should be (from the URL about the ERA Book): In the fall of 1946, ERA received its first major contract from the Office of Naval Research to compile a report on ?High Speed Computing Devices?. This report, which became the definitive study of the infant state of computing, was later published in book form by McGraw Hill. During this project, ERA personnel was given access to classified government reports and worked with computer pioneers John Mauchly and J. Presper Eckert, inventors of the ENIAC, and John von Neumann, of Princeton University's Institute for Advanced Study. ERA was dependent on government funded cost-plus--fixed-fee contracts. In August 1947, it began work for the Navy on Task 13 - a project to design a general all-purpose stored-program computer. During this project ERA developed the first magnetic storage drum; the technology upon which the next two generations of computers was based. In October, 1950, ERA completed work on the Atlas computer - America's first electronic stored-program computer. The Atlas with its 2,700 vacuum tubes was capable of running twenty-four hours a day with only 10% of the time allotted for maintenance. -- The commercial verison of "Atlas" is the 1101

19 years, 1 month

"High Speed Computing Devices"

by aek＠bitsavers.org

here is a description of the origins of the book: http://www.hagley.lib.de.us/2015.htm

19 years, 1 month

system 36 on eBay

by aek＠bitsavers.org

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=64029&item=5777993013 looks pretty complete shipping is excessive, though.

19 years, 1 month

WTD: 5.25" DSDD drive & Acorn Master128 keystrip scan/schematic

by philpem＠dsl.pipex.com

Hi folks, I'm after a 5.25" 80-track (preferably 40/80 switchable) DSDD drive, jumperable for DS0 and 300RPM rotation, suitable for an Acorn Master 128. I'm also after a decent-quality scan of the keystrip that came with the Master 128. A copy of the Master 128 schematic and/or service manuals would also be rather nice :) Thanks. -- Phil. | Acorn Risc PC600 Mk3, SA202, 64MB, 6GB, philpem at philpem.me.uk | ViewFinder, 10BaseT Ethernet, 2-slice, http://www.philpem.me.uk/ | 48xCD, ARCINv6c IDE, SCSI ... How much sin can I get away with and still go to heaven?

19 years, 1 month

AN1127 application note

by aek＠bitsavers.org

I did a little digging, and every pointer on the web went to sps-moto.com (now dead) and freescale appears to have deleted that app note. Hopefully someone wgot the whole appnote tree (unfortunately I didn't..)

19 years, 1 month

WTD: 5.25' DSDD drive & Acorn Master128 keystrip scan/schematic

by leeedavison＠yahoo.co.uk

>> was to format it on the 48 tpi drive and then re-write it on the >> 96 tpi drive. > What good does that do? Against reason it used to work. > You'd be better off bulk-erasing the disk (with an AC-enegized > electromagnet, not a disk drive!), formatting it on the 80 cylinder > drive, writing it there, and the reading it on the 40 cylinder one. That wasn't an option, the degausser available couldn't reliably erase a disk. The eventual solution was to replace the few remaining 40 track drives. Lee. . ___________________________________________________________ Yahoo! Messenger - NEW crystal clear PC to PC calling worldwide with voicemail http://uk.messenger.yahoo.com

19 years, 1 month

TurboROM Kaypro Update

by ajp166＠bellatlantic.net

> >Subject: TurboROM Kaypro Update > From: Doc Shipley <doc at mdrconsult.com> > Date: Sun, 29 May 2005 01:53:41 -0500 > To: General at mdrconsult.com, "Discussion at mdrconsult.com":On-Topic and Off-Topic > Posts <cctalk at classiccmp.org> > > Allison offered to provide a system disk made on a Kaypro 4/84 w/ >turborom, but has a time-critical prior project that prevents restoring >5.25" disks to the 4/84 right now. > > I had also asked on the CP/M newsgroup, and somebody there sent me a >set of teledisk images that might help. The Support and Developer SSDD >disks for a turborom'ed K-II, which are unfortunately not bootable, and >the DSDD Software Support Disk that came with the TurboROM purchased for >his own K10. > > I have a Mitsubishi MF501A-352U DSDD drive (with full-height black >face-plate, no less), so I have it temporarily replacing the Kaypro's >Tandon TM100-1A. Those are very nice drives. > And the K10 Software Support disk finally got me to an A0> prompt! >It looks like the turborom is fairly model- and version-agnostic. Yeehaa! turbo rom is fairly complient and also good to have. > The hard drive formatter (K10FMT.COM) works, as do TURBOGEN.COM and >MOVTURBO.COM, so I can now boot from the hard disk. :) > > I'm not CP/M-savvy at all, but it looks like I have enough here to >make this a functional system. > > Allison, I appreciate the encouragement and the info. I'd like to >stick a pair of 3.5" drives in, so if you do run across the DIP switch >settings for the floppy personality module, I'd like to have that. And >a system disk would still be interesting when your other work slows down. I have them here. Each switch pair corosponds to one drive of the possible four. pairs are 1/2, 3/4, 5/6, 7/8. The settings are: off/off no drive installed (odd number switch being on, drive exists) off/on no drive installed (even numbered switch selects 48/96tpi) on/off 48tpi drive on/on 96tpi drive For a 3.5" floppy you need to select 96pi and format with the advent formatter (not a dos formatted disk!). Also the floppy must have a drive select header/switch that allows for 4 drive non-twist cable select. It's possible to use newer 3.5" drives but plan on modding the drive select right at the edge connector. Disk notes: Two sided 96tpi 3.5 or 5.25 gets you either 720k or 781k formatter dependant. Also 3.5" drive are being used as 720k (one hole media) so they must be able to function as such. The 48tpi drive get you half that. Oh, the last drive is the one (and only!) to have terminating resistor installed/enabled. My 4/84 has two 3.5" embedded inside (drives D: and E:) as if it were a hard disk and one on the console front (A:) the second drive is a usually 48tpi(teac FD55BV) for compatable ops. Having the drives inside the case seems useless but they have media in them and are fully loaded as a useful 1.4mb library. In the CP/M world that's a considerable amount of space. > And finally, a question - does the Kaypro support a serial console at >all? The VDT is OK, but it's tiny. :\ Yes it can. I believe the IObyte needs to point con: and key: to serial port. This is very bios dependent. Hope this helps. Allison

19 years, 1 month

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test-drb May 2005