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Teletype ASR 33 S/N 256219 Repair

by billdeg - 06/04/2012
Total messages in this thread: 4
Last Post: [ Restoration Complete ] 11/29/2012
The keyboard of the Teletype Model ASR 33. The cover of the teletype has been removed.
I have been working to restore teletypes lately. I am almost done with this one, in fact it was running just fine until I read in a long tape using the reader. Afterwards I noticed that the characters that use the 6th channel/cam to print characters from the keyboard was being switched with channel/cam 7. For example, if you hit the "4" key, the printer prints a T instead. The Model 33 typewheel code chart says that the 4 is printed using channel 3-5-6-8. A "T" is printed by using channels 3-5-7-8. I have asked Wayne from the GreenKeys mailing list for help. He has a teletype repair and restoration business and I highly recommend his services. Closeup p... [ read more ]

Tandon 100-2A alignment w/o align disk

by billdeg - 11/28/2012
Total messages in this thread: 1
Originally posted on TRS 80 Yahoo group, will work on any Tandon 100-2A "..article by Philip Avery ... He used a TRS80 M3 to undertake radial alignment on Tandon drives with a scope, but without an alignment disk. http://www.clas...andon-m100.htm Terry (tez).."... [ read more ]

Transplanting ASR 33 Power Supply

by billdeg - 11/27/2012
Total messages in this thread: 1
a Teletype ASR 33 UCC-6 (call control unit) power supply
Pictured is a UCC-6 unit removed from a Teletype model ASR 33. The UCC-6 is the power supply for the printer, keyboard, and punch (but not the reader). Click image for larger view.
Transplanting the power supply (the UCC-6) from one Teletype model ASR 33 to another (or from a KSR-33) is much easier than I thought it would be. I thought that there would be a lot of complex re-wiring, desoldering, and re-soldering. Not so! Here are the simple steps. Teletype ASR 33 UCC-6 terminal strip
Step 1. Remove the molex plugs attached to the back of the UCC-6.... [ read more ]

Lobo Drives International Docs/Software

by billdeg - 04/24/2008
Total messages in this thread: 2
Last Post: [ Lobo with Shugart 800 Drives ] 11/22/2012
The following are the Lobo docs and software I have on hand Lobo brand OEM sa850/851 double sided diskette storage drive service, maintenance manual (c) 1977 Shugart Assoicates (print. 1980) - In short the Lobo SA850 and Lobo SA851 are to be treated as if they were Shugart double sided 850's. NOTE The SA800/801 are the single-sided equivalent. sa400 Minifloppy Diskette Storage Drive OEM, Service, Maintenance Manual "Preliminary October 1982 Max 80 Operation Manual" (spiral binding) Max 80 Operation Manual (hard cover 3 ring binder and hard-cover box) 1984 SOFTWARE: LDOS OS software v. 5.1.3 for Max-80 Lazy Writer for Max 80 MAX-80 CP/M 2.2 (bad disk) ... [ read more ]

Computers Built 1940 - 1950

by billdeg - 11/15/2012
Total messages in this thread: 2
Last Post: [ On Firsts Lists ] 11/15/2012
Taken from a SIGCIS-Members thread, edits by me. Year Computer Country Name 1941 Z3 Germany 1942 ABC U.S. 1943 Colossus U.K 1944 Colossus II UK (and eight further copies/variants of Colossus II 1944/1945) 1944 Harvard Mark 1 U.S. 1944 Bell Labs Model 3 U.S. 1945 Z4 Germany 1946 ENIAC U.S. 1947 SSEC U.S. 1948 SSEM U.K. 1949 BINAC U.S. 1949 EDSAC U.K. 1949 CSIRC Australia 1949 EDVAC U.S. 1949 MADM U.K. 1950 MESM Ukraine MORE: Bell Labs computers From Paul Ceruzzi's Reckoners: Model II Model IV Model V (two copies) Date completed 7-1943 3-1945 12-1946, 8-... [ read more ]

Edmund Scientific Co Ad 1973

by billdeg - 11/06/2012
Total messages in this thread: 1
Advertisement from Popular Electronics January 1973. Note the "New Electronic Digital Computer Kit" in upper right corner. This would be a very early computer kit that pre-dates the Mark 8/Scelbi. At this time I do not know if this was a microprocessor-based system or a Kenbak-type digital computer. The manufacturer is from Barrington, NJ. Click image for larger view.
... [ read more ]

Hazeltine 2000 Terminal

by billdeg - 07/30/2012
Total messages in this thread: 2
Last Post: [ Core Memory Hazeltine Testing ] 11/03/2012
Hazeltine 2000 Terminal
The Hazletine 2000 Terminal. Click image for larger view.
So far I have confirmed that the power supply works, the keyboard works, and local model works. The character generator seems ok, but the screen RAM is faulty (stuck bits?) and some locations on the screen will not change to the character I type when the prompt passes. This terminal was first produced in the early 1970's, so it's another one of those "glass teletypes" that can operate with a current loop or RS232 mode. Reminds me I also have a model 1500 terminal to restore as well. The 2000 was the first Hazletine terminal, pre-dating the 1500. More to come... pics ... [ read more ]

Fall 2012 Workshop

by billdeg - 10/31/2012
Total messages in this thread: 1
Doug and Ian working on a Zenith Z-19 terminal
Another successful workshop, this time at my house in Landenberg, PA. Systems tackled at this event include a Burroughs TD 833 6800 processor based terminal, MARCH's Commodore PET 2001-8, two more PETs, two MITS Altairs (8800 and 8800a), a Hazeltine 1510, TRS 80 Model 1, Zenith Z-19, Northstar Horizon, Cybernetic Mathiputer, and an ASR 33 Teletype.
After jumpering a Processor Technologies 3P+S for 110 baud 20mA current loop, Jon toggled up a test program and with great anticipation sent a "D" character to the Teletype.
More photos... [ read more ]

Cromemco System Three

by billdeg - 10/26/2007
Total messages in this thread: 16
Last Post: [ Notes PerSci and Other Drives ] 10/23/2012
Today I picked up a donation consisting of a Cromemco System Three Model with dual 8" drives (PerSci) CS3 S/N: 31856. The condition is excellent. There are few scratches, color nice, etc. The system came with the Cromemco desk (same desk as seen in the brochure), the computer fits in the desk. Hazletine 1510 - The display. Appears to work, display is in great shape. Keyboard good, a tiny bit of screen burn, but strong display tube, no mold. s/n: 213442-001 model: 4DTD155255 Texas Instruments Omni 800 / 810 RO Terminal Very Good Cond. part number 0994293-0002 s/n 04711 42035 parallel Fortran IV and a CDOS boot disk, data disks. 8". I was told $15000 was spent on this system in 1979. The owner was moving out of his estate, a good 20+ acres at least on the top of a hill. A pretty expensive personal computer! NOTE: The three pieces of hardware were cabled together... [ read more ]

SAGE, UNIVAC Modules and Analog

by billdeg - 10/04/2012
Total messages in this thread: 1
Pictured is an exhibit containing plug-in modules from the mainframe era of computing, plus a module from the Donner 3500, manuals, and a Digi-Comp 1. Click image for larger view
To the left is a plug-in module from the SAGE radar processing unit called AN/FST-2 (1955). The SAGE was a huge mainframe and there would have been hundreds of these modules in a single AN/FST-2. The AN/FST-2 had approximately 7100 vacuum tubes in three bays of racks, powered by two 400 cycle motor generator sets. The system would process the raw radar data, antenna position inform... [ read more ]

Hot Rodding Your Commodore 64 / C-128

by billdeg - 10/02/2012
Total messages in this thread: 2
Last Post: [ iUEC Drive Browser Utility ] 01/12/2013
Picked up one of these uIEC units, with a custom case, at the Vintage Computer Festival MidWest. Jim Brain invented the uIEC. It's an SD card reader that works on any Commodore system that can attach to a 1541 drive, plus it includes JiffyDOS. With JiffyDOS and the uIEC, you achieve the luxury of subdirectories and fast access to thousands of programs. Amazing.
BUY THE uIEC: http://store.go4r...ducts/uIEC_SD.html I am amazed at the modern after-market C64 hardware products that keep Commodore systems connected to today's hardware. My "every day" JiffyDOS C-128 System. I recently replaced the keyboard, that's why it looks a tad darker than the rest of the system. Since this picture was taken I fixed the red LED.... [ read more ]

Intel MDS 720 Dual 8 inch disk drive

by billdeg - 07/30/2012
Total messages in this thread: 2
Last Post: [ Shugart 800 Jumpers Intel MDS 720 ] 09/30/2012
Intel MDS 720 Dual 8 inch disk drive 1979
The Intel-branded model MDS 720 dual 8 inch disk drive enclosure. Click image for larger view.
The "before" image before restoration starts. These are very rare, I could not find any info about this drive on the web, but it looks to have Shugart 800's in it. We'll see... pics... [ read more ]

Epson Geneva PX-8

by billdeg - 08/19/2007
Total messages in this thread: 3
Last Post: [ Epson PF-10 Disk Drive ] 09/24/2012
The Epson Geneva PX-8 was an early LCD laptop from Epson. It ran CP/M and used a Z-80 processor. The standard storage was a mini cassette, but an external 3.5" disk drive was available. I have done some preliminary testing of this system, the LCD is a little weak. Fortunately I have a replacement display. I have the complete documentation and extra parts as well as the complete system. In addition to the PX-8 system I have a CX-80 Acoustic Coupler modem, a PF-10 external 3.5" disk drive, and Dbase II, The "Travelers Pack", and the Epson Software Libarary software. UPDATE: Looking for the utility disk that came with the PF-10 disk drive.... [ read more ]

Vintage Computer Festival MW 2012

by billdeg - 09/24/2012
Total messages in this thread: 1
Exhibitors setting up their booths in the ECCC room
Nick brought his restored PDP 8 front panel-driven 6800 processor S-100 computer. We look forward to more developments with this system. Click image for larger view. (More photos link below.)
The whole C-64 scene is vibrant and connected to today's computing. Here is a C-64C with a Commodore Flyer Internet Modem + Disk Drive Emulator Click image for larger view.
[ read more ]

Digital VT 102 Terminals

by billdeg - 07/30/2012
Total messages in this thread: 5
Last Post: [ Repairing dead vt102 ] 09/19/2012
Digital VT 102
Digital VT-102 Terminal
Picked up 4 of these, I will make one working unit, sell/donate the rest. More Pics... [ read more ]
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