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Digital PDP 11/05 S in BA11-K

by billdeg - 10/01/2015
Total messages in this thread: 12
Last Post: [ Chassis Covers ] 01/18/2016
BA11-K Mounting Box Fans
Started working on piecing together a PDP 11/05 S in a BA11-K Mounting Box. Pictured here are the fans that cool the H765 power supply's transformer. Note there are no DC voltage bricks installed. I removed the metal fan covers (they were rubbing the fan blades when you spin the fan manually). Click for larger view.
BA11-K Mounting Box Fans
This is a view of the power distribution board installed in the PDP 11/05 S chassis. The c... [ read more ]

Tele-Graphic Computer Systems Inc.

by billdeg - 12/23/2015
Total messages in this thread: 1
Tele Graphic (Tele-Graphic) Computer Systems Inc. George Risk model 753 keyboard enclosure
Tele-Graphic Computer Systems, Inc. of Shawnee Mission KS produced a keyboard enclosure for the George Risk model 753 ASCII keyboard. One may have purchased a keyboard like this for early S-100 and other homebrew computer systems. Click for larger View.
Note the "Here Is" key, as found in the ASR 33 Teletype. Tele-Graphic chose the popular George Risk keyboard for its enclosure because of its flexibility and reliability. George Risk ASCII keyboards are highly sought-after today for Altairs, IMSAIs, etc. This keyboard would have been perfect for early S-100 systems. [ read more ]


by billdeg - 04/17/2013
Total messages in this thread: 3
Last Post: [ Repairing Legs of a 1702A ePROM ] 12/22/2015
Processor Technologies PTCO 2KRO 1702A 2K eProm Board
Processor Technologies PTCO 2KRO 1702A 2K eProm Board, .cir 1976. Click for larger View.
Here is a dump extracted from three 1702-A ePROMs installed in a PTCO 2KRO board. The dump below consists of the three 1702-A ROMs. The first is (my guess) some sort of 8080 monitor program or bootstrap, the second is the PTCO VDM-1 board initialization routine, and the third may be additional instructions for a 3P+S card to interface to run with a teletype (ASR33?). Just a guess. I will update the thread after I get a chance to test. I also have to determine the memory locations of each. The card is not documented on the web. The jumper W is in the "1" position. I am guessing... [ read more ]

Alphacom Terminal Computer

by billdeg - 01/30/2013
Total messages in this thread: 2
Last Post: [ Cover Removal Interior Inspection ] 11/21/2015
The 1969-70 Alphacom was an intelligent terminal used for form processing and possibly some other smart terminal functions. This terminal has a form factor that was ahead of its time, making it look like a SOL-20. On top is a standard television set with an "Alphacom" label. Click image for larger view.
Here's a good project for me. Nothing much is known about the operation of the Alphacom company or its products other than what the previous owner told me, and what I can deduce from the functions printed on the keyboard. I have located no documentation or advertising brochures, as of this writing. Is it just a terminal or did it perform some computing functions too? Probably wishful thinking. What w... [ read more ]

Robert A. Stryk - Oral History

by billdeg - 11/09/2015
Total messages in this thread: 1
Video by Jennifer McDermott Subject: Robert A. Stryk. Part of a series: Digital Oldtimers. Oral Histories from the Early Years of Computing Van de Graaff accelerator earned Robert A. Stryk a PhD in nuclear physics in 1967. He observed quantum tunneling of the particles and solved non-linear least squares problems using a CDC 1604 computer. photo credits. Can you spot the image(s)? I found one photo I took at 29:31 into the video. [ read more ]

TRW Mobile Computer Centers RW-300 / 340

by billdeg - 11/11/2014
Total messages in this thread: 2
Last Post: [ Book: French computer manufacturers ] 11/09/2015
The TRW RW-300 Digital Control Computer, 1960
Pictured is the The 1960 RW-300 Digital Control Computer which is the heart of the RW-300 Portable Process Analysis Unit. "..The RW-300 portable process analysis unit represents a new approach to the problem of analyzing and improving the performance of a chemical or industrial plant. It makes available for the first time in a mobile research unit the powerful capabilities of the RW-300 Digital Control Computer.." "..The unit is contained in a 28-foot semi-trailer for easy removal from one site to another..." Click image for larger view.
TRW Computermobile Mark II portable versiopn of its RW-340 mini comput...<strong> <a href=[ read more ]

Video of Altair Playing Music

by billdeg - 05/06/2009
Total messages in this thread: 2
Last Post: [ Centre For Computing History Video ] 11/09/2015
On page 6 and 7 of the Feb 1976 Dr. Dobb's Journal there is an article about using the Altair 8800 to make music by sending radio signals to a nearby AM radio. The article provides a program listing in octal, and the data for Fool on the Hill by the Beatles and Daisy (2001 Space Odyssey, etc.). To load the program just toggle in the program and data into the addresses suggested. [ read more ]

Digital TU10 DECmagtape Transport

by billdeg - 09/05/2015
Total messages in this thread: 2
Last Post: [ Disassembly and Cleaning ] 10/30/2015
TU10 DECmagtape
circa 1972 TU10 DECmagtape Transport with tape door open and wall plates removed. This unit includes the TU10M (Master) backplane. Click for larger view.
TU10 DECmagtape backplane
This TU10 was a master unit ("TU10M"), meaning it contained the TM11 controller backplane installed in the cabinet with its own separate power supply. Pictured is backplane card sets for the "slave" components. You can see the TM11 controller as the backplane parallel to the front of the chassis. Click for larger view. [ read more ]

NASA Vintage Programmer Position Avail

by billdeg - 10/29/2015
Total messages in this thread: 1
http://www.popularmechan...retiring-engineer/ A dream job if you like vintage computers and know your stuff...... [ read more ]

Fortran Man - F-Man and Billy BASIC

by billdeg - 09/30/2007
Total messages in this thread: 2
Last Post: [ Rebuttal by Original Author of F-Man ] 09/27/2015

Click for larger image

Fortran and IBM were symbols of authority-controlled mainframe computers, unavailable to the the public. Bob Albrecht, a founder of the People's Computer Company, considered FORTRAN a stifling and boring programming language. Bob undoubtedly influenced the opinions of the authors of Fortran Man.

F-Man's side-kick "Billy BASIC is a non-flattering reference to Bill Gates of Micro-soft. Gates was at the time criticized by the PCC leadership, the Homebrew Computer Club, Community Memory, and many old-school hardware hackers for discouraging distribution of the Micro-soft BASIC software unless the user paid for their copy. Up to t... [ read more ]

IC and chip inventory

by billdeg - 09/27/2015
Total messages in this thread: 1
Thread date is last update date. The purpose of this list is to make it easier for me to determine if I have certain loose chips available. ID 2nd ID Comment/Quantity 2114-550 120 2708 1 2716 TMM3233D EPROM 1 6509 6581 6820 68A50 (6850) 3 7403 8146 8331 1534 9616 1 1702 AM1702ADC 1702 PROM 2111A-4 2 2382-4014 8051 INTEL 77 2516JD-45 DAP8114 2641-2569 D8288 S4349 1 27128-20 8447 EPROM 1 2716 2 27P08JDL P7906 EPROM 1 291YCC E 8544 ?? 1 318004-04 3384 PAL Kernal ROM CBM 264 325302-01 1486 3334116 2 341001 APPLE78E0(1 BAD?) 2 341-0010-00 APPLE 3.2 CHIP 341-0036-00 88241 APPLE 341002 APPLE78E8 (BAD?) 341003 APPLE78F0 (BAD?) 341-0909- APPLE1978 369-6502-A 11 4116 21 51CNKNK ULN2003AN 2 5864PN-15L 4 6509R4 6509R7 2 6522 1086 6525A 4 ... [ read more ]

Commodore 64 / 1541 DRIVEKNOCK

by billdeg - 09/22/2015
Total messages in this thread: 1
Attach your C64 to your non-functioning disk drive of choice and put a scratch disk into the drive. Power up to READY prompt. Run this program OPEN15,8,15 PRINT#15,"V" CLOSE 15 This is called the "driveknock" program, I used to use it to sometimes revive a failing drive. Should work for many kinds of C64 serial drives.... [ read more ]

PACS: Reflections by Kathleen Mauchly

by billdeg - 09/18/2015
Total messages in this thread: 1
Kathleen Mauchly penned a column in the Philadelphia Area Computer Society (PACS) newsletter "Data Bus" from 1981-83. Kathleen, wife of John Mauchly co-inventor of the ENIAC and other computer systems, offers her perspective of the post war computer revolution and other topics. Click image to enter articles and scans directory to download.
... [ read more ]

Apple IIc

by billdeg - 09/17/2015
Total messages in this thread: 1
Apple IIc
The 1984 Apple IIc was the first portable Apple II model. In the rear of the unit the carrying handle could also be lowered to lift/hold the system at an angle to make it easier to type. The disk drive was built into the side. Click for larger view.
Apple IIc
View of the Apple IIc introduction disk intro screen, using a the Apple Monochrome Monitor. Click for larger view.
... [ read more ]

Digital VT100 Terminal

by billdeg - 09/12/2015
Total messages in this thread: 1
Digital VT100 Terminal
The DEC VT100 is probably the most famous terminal of the late 70's early 1980's. This unit has the Advanced Video Option (AVO) installed which allows 24 lines of text in 132 column mode. Click for larger view.
Being that I will use this terminal mostly for accessing my VAX 4000, I set it to default to 19200 baud. The other "Setup B" settings are: 1) 0101 2) 0011 3) 0010 4) 1010 So, if you read this post and you are struggling with getting your VT100 to communicate with your computer... First connect your computer to the terminal. You may need a NULL MODEM adapter (I did not), situations vary. Understand the communications settings your computer or server requires. Make sure your vt100 is in ONLI... [ read more ]
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