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Atari 800 ... portable?

by billdeg - 06/09/2009
Total messages in this thread: 1
Well not exactly. This unit sports a handsome Casemaker travel bag.
The Atari 800 with a Casemaker travel bag. Click image for larger version.
I don't pay much attention to Atari computers on this web site, but I do think that they're a great company. I have a small project involving the restoration of the metal shields that are attached to the underside of the cartridge cover. The shields sometimes detach from the inside lid of the cartridge cover because the system's adhesive foam deteriorates.
Three 16K RAM cards and one 10K ROM card are installed in... [ read more ]

Digital (DEC) PDP 11/05 NC Assembly

by billdeg - 06/09/2009
Total messages in this thread: 21
Last Post: [ Teletype Reader Control 4915D ] 07/22/2014
Ted Nelson speaks quite highly of the Digital PDP 11 series in his book Computer Lib / Dream Machines.
Picture of the PDP 11/05 NC card cage and M9970(in the wrong slot). Click image for hi res version.
The only thing that prevented DEC from launching the PC revolution three years earlier was price, in my opinion. All of the other ingredients were there for a fine PC. The PDP 11/05 was the OEM version of the PDP 11/10, so you find all kinds of variations of this system sometimes paired with the DEC GT40 Graphic Display Terminal. Complete set of Pictures Some notes... 1) Cleaned (enough for now).. got all of the styrofoam peanuts, dust. 2) Started with an [ read more ]

Cataloging ESF wafer library

by billdeg - 03/09/2008
Total messages in this thread: 2
Last Post: [ format wafer in 2nd stringy drive ] 05/29/2009
I am in the middle of cataloging all of my working ESF programs. I have been side-tracked by other projects, but soon enough I'll get through it all. ...a few screen shots taken during testing: I sold my spare Exatron Stringy Floppy drive on Ebay last week. What's next... Using TRS 80 Model 1 1. Implement a method for converting wafer contents to cassette (Users guide has instructions) 2. Implement a method for converting wafer contents to disk The issue with #2; you can't have the expansion unit and the ESF operating at the same time because they use the same expansion port. So what I believe you have to do is set up two TRS 80's and share one cassette drive. The first TRS 80 will have the stringy floppy and the cassette, the 2nd will share the same cassette (using a switch box) player and wi... [ read more ]

Hobbyist Computerized Bulletin Board

by billdeg - 05/21/2009
Total messages in this thread: 1
I have posted a scan of the Nov 1978 Byte Article (page 150) Hobbyist Computerized Bulletin Board by Ward Christensen and Randy Suess This is the important article about the famous CBBS/Chicago BBS - Considered the first home brew BBS. http://vintageco...0ward%20christensen.pdf... [ read more ]

Old Timer's Day at PACS

by billdeg - 04/11/2009
Total messages in this thread: 2
Last Post: [ Slides from Meeting ] 05/17/2009
The Philadelphia Area Computer Society cordially invites the members of MARCH to: "Old Timer's Day" Saturday, May 16th 2009 Super Giant food store Community Center, 2nd Floor 315 York Road Willow Grove, PA 19090 With a special guest appearance by: Bill Degnan from 12 to 1 PM. There will be tables set up for folks to demonstrate their vintage computers after Bill's talk. For further information go to: Please plan to attend, to make this a very special day. Thanks, Ron Kushnier ... [ read more ]

Landenberg Today Article

by billdeg - 05/04/2009
Total messages in this thread: 1
Yours truly is on page 86 http://www.bluetoa.../publication/?m=507&l=1... [ read more ]

Another 5150 Restoration

by billdeg - 04/28/2009
Total messages in this thread: 1
Today I got an IBM 5150 B in the mail. It was absolutely filthy. There was a layer of dirt-turned-crud covering everything. There were playing cards stuffed in the B drive and an old disk in the A drive. The system did not power up. I almost gave up right then, but .. I took out all of the cards (CGA, AST SixPak, IBM floppy drive controller) and then cleaned everything as well as I could. Powered up - fan started, long beep two short beeps (missing/bad display). Ah, it must be one of the cards shorting out the power supply. Correct - It was the display card. I replaced it. Put everything back in to the slots. Powered up - fully functional. I cleaned it to "excellent" condition with a magic eraser, paper towels with soap and water, q-tips for the keyboard and drives. Another computer saved from the dump. ... [ read more ]

Landenberg Hack Weekend

by billdeg - 04/26/2009
Total messages in this thread: 1
Dan R and Bill Dr #3 came to my house this weekend. A lot was accomplished. We worked on an Northstar Horizon and used it to match a 2nd backup drive and controller card for use in another system. IMSAI 8080 - Dan demoed how his system boots to IMSAI BASIC from PROM which can load programs from simulated terminal input, and he demonstrated his modified a lunar lander program to land on autopilot. Altair 8800 We made a copy of the Altair Monitor II using a DOS-based EPROM burner and Dan's IMSAI 8080 for testing it. The monitor is patched to use the Altair SIO-2 controller but we did not quite get either cards on hand running properly. We put the EPROM on a 64K Tanner RAM/ROM card and it appears to work correctly on a front-panel system. I anticipate that we will be able to install on the Altair when it's ready. We also identified and replaced a slew of bad front panel chip... [ read more ]

EC-1 Falling Body Program

by billdeg - 03/16/2009
Total messages in this thread: 3
Last Post: [ EC-1 Video with Tektronix 7313 ] 04/18/2009
The Heathkit EC-1 wired for the "falling body" program.
This weekend I worked with Bob Grieb, Dan Ragonti, and Mike Lowen to test the Heathkit EC-1 computer. We made it all of the way to the first exercise in the user guide - the falling body program. Bob and Mike brought tube testers and fortunately the tubes were all OK. We cleaned all of the plugs and connectors with soap and water. Dan hooked up a Variac in series with an incandescent light as a current limiter, so we could monitor the reaction of the EC-1 to current load. Bob used a volt meter to test the electronics and cleaned up a few things (solder joints and a loose wire), but nothing major was needed to get the old girl back up in running... [ read more ]

CISC/CPEG 367 scheduled

by billdeg - 04/16/2009
Total messages in this thread: 1
Today I learned that I am scheduled to teach another semester at the U of Delaware. Please sign up for my class! Contact me if you have questions. http://pri...8&session=1§ion=010... [ read more ]

year of Lanier models?

by cledger1 - 04/16/2009
Total messages in this thread: 2
Last Post: [ Lanier 103 ] 04/16/2009
Does anyone know the year of the Lanier model 103 word processor? Was is available more than one year?... [ read more ]

Bunch of little things

by billdeg - 04/15/2009
Total messages in this thread: 1
1) I built from parts two more IBM systems, one IBM stock dual drive 5150 PC and an IBM XT 5160. The XT has a ST 412 HD, with AST Six Pak. - 640K RAM and 10MB - who could need more than that? I put IBM DOS 3.3 on the HD. 2) I got my Northstar Horizon to boot using the ADM 3A terminal. 3) I have been able to successfully type in a lot of programs into my IMSAI lately (using CUTTER monitor program), and the system holds long enough to complete and run the program. 4) EC-1 - New oscilloscope and pictures of underside wiring... [ read more ]

Reforming Electrolytic Capacitors

by billdeg - 04/11/2009
Total messages in this thread: 1
Originally posted on Midatlantic Retro Yahoo Group: - In, Mike Loewen wrote: > > > I tore apart my IMSAI in order to remove the four large electrolytic > capacitors for testing/reforming. There are two 9500uf-30VDC caps and two > 95000uf-15VDC caps. Here's the rig I put together for bringing them back > to life: > > http://sturgeon.css.psu....I/Reforming-L.jpg > > I put this together after reading many documents about testing old > capacitors. Hidden behind the cap is an 8K power resistor in series with > the cap. The small meter is measuring the voltage output from the the > power supply (a HP 6443B 0-120VDC/2.5A unit), in this case 25.0 volts. > The large meter is measuring the current flowing through the cap, 0.11ma. > The voltage across the cap is 24.7V at this point. > > I started... [ read more ]

IBM PC 5150 Dump a BIOS using

by billdeg - 06/14/2008
Total messages in this thread: 3
Last Post: [ Another 5150 A BIOS DUMP ] 04/04/2009
This is a mirror of the original page C:> DEBUG -N MYF000.BIN (resulting file will be named MYF000.BIN) -R BX (set BX=0000H/CX=8000H as count of bytes to write, 00008000H = 32K) BX 0000 :0000 -R CX CX 0000 :8000 -M F000:0 8000 0100 (copy 32K bytes from F000:0 to offset 0100 in local segment) -W 0100 (write from offset 0100 in local segment) Writing 8000 bytes -N MYF800.BIN (resulting file will be named MYF800.BIN) -M F800:0 8000 0100 (copy 32K bytes from F800:0 to offset 0100 in local segment) -W 0100 (write from offset 0100 in local segment) Writing 8000 bytes -Q C:>copy /b myf000.bin+myf800.bin final.bin (optional, concatenates together the two myfxxx.bin files into final.bin)... [ read more ]

Another IBM 5150 16KB-64KB CPU

by billdeg - 04/04/2009
Total messages in this thread: 1
I traded a working IBM 5150 with 64KB-256KB CPU for an earlier (but not working) 16KB-64KB CPU Model.
This is a 10/1981 model, without the IBM-labeled disk drives. I have not yet confirmed that IBM sold systems with non-labeled drives, or whether these were added by the reseller to save money. The date stamp on the IC's of the drives range from 1980-2nd week of 1982, and one could theorize that the drives were added later, after market. That explains why they're not "IBM" labeled. Just my hunch.
I swapped out a working 16KB-64KB CPU board and brought the system back to life. The drives work, I did not test the CGA card that also came with it. The previous owner had both a monochrome and CGA card installed, which may have caused the motherboard to short out. Not sure. A... [ read more ]
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