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Apple //GS (II GS) Battery

by billdeg - 11/18/2017
Total messages in this thread: 1
Apple II // GS Battery
Pictured is the original 1/2 AA Lithum battery dated 1/8/1987. The voltage measured from the terminals was nearly 0. Although the battery was not leaking yet, eventually it will leak and if left unchecked ruin the motherboard. So I snipped it off, leaving the posts still attached and folded out of the way. Click image to view larger version of image.
Apple II // GS Battery
Snip, battery removed. If I used this computer a lot I might put in a new battery, but it's not necessary... [ read more ]

Items Wanted

by billdeg - 11/17/2017
Total messages in this thread: 1
This list is maintained regularly. Thread date is last update. Contact me Here. DecMate I 8" OS/8 disk(s), and if anyone has a spare 37-25 pin RX02 cable. Working PDP 11/40 EIS card, KE11-E M7238 Working RK05 UNIBUS controller cards for testing same, borrow or buy these. PCS Micropac 80, Superpac 180 and related DATAC 1000 6502 trainer RCA COSMAC Microkit manual MPM-103. GO Tablet Model G400 power supply or battery (24V ). Commodore B Series hi-profile keyboard(s) NEC PC6011A Expansion Unit Computer Data Systems "Versatile 2" s-100 computer 1977 (Newark, Delaware USA computer) Casio FX-9000P Canon CX-1 or BX-3 Acorn BBC Model A Eagle Computer Eagle II E (I have disks, need computer) Sord SM80X Oki 1F COM7 laptop Morrow Decision 1 Microvoice Nugen Sycor Model 302 Key-Cassette Terminal California T... [ read more ]

Commodore CBM PET 2001-32B Keyboard

by billdeg - 11/03/2017
Total messages in this thread: 2
Last Post: [ CAP C16 Missing, why? ] 11/17/2017
The Commodore CBM (PET) 2001-32B, after restoration. Click image for larger view.
After years sitting on top of a dryer in the laundry room, the entire motherboard became covered by lint dust. This photo shows some dust removed, revealing a pretty serviceable circuit board with little rust. Click image for larger view.
Keyboard Repair The system boots but other than the "u" key and the "Enter" key the keyboard does not respond to keystrokes. I took apart the keyboard. The circuit board tests OK and the key... [ read more ]

Build a bootable RSX11/M on RL02 disk

by billdeg - 02/06/2017
Total messages in this thread: 2
Last Post: [ Adding PDP 11 Programming ] 11/14/2017
Scan of my cover of the Digital pdp11 RSX-11M Beginner's Guide manual.
RSX-11M Manuals http://wwcm.syn...0Manuals.html This thread describes how one might use simH on a $9.95 Next Thing Co CHIP to make an RL02 image of RSX11/M V 4.0 BL 32 (BASELINE). I got the how-to via web search and clues from CCTECH and simH user group members interested in the project. My case - For my PDP 11/40 I have no working EIS option card. (Otherwise I'd be using UNIX 6.) I already have RT11 running but I wanted to try RSX11. I was told that RSX11/M v.4.0 BL 3.2 is the newest OS version compatible with my system. Distribution media disk images for RSX11/M can be found in RL01 format but not RL02, so I had to first build one RL01 boot disk using 4 RL01s and then port to RL02. [ read more ]

Donner 3500 - an early portable computer

by billdeg - 05/25/2009
Total messages in this thread: 9
Last Post: [ Retro Thing Article ] 11/11/2017
The 1959 Donner 3500 portable analog computer. Click for larger image.
Pushing the exploration of portable computing one giant step farther (for me), here is a quick glimpse of the Donner 3500...My copy of the instruction manual was published in 1960, after Systron merged with Donner to form Systron-Donner Corporation. The manual depicts a Model 3500 with leather handles on the sides. The computer I have has metal handles on top, and I am unsure if this means it's an earlier model made before the merger or if the handles were added by the owner. Because they are symmetrical, I'd like to believe that they are factory/original handles. Also, this computer's serial number is 107, which also indicates an earlier version. Serial numbers can be deceiving however.... [ read more ]

1996 Digital AlphaServer 2100 4/275

by billdeg - 05/11/2015
Total messages in this thread: 9
Last Post: [ Alpha Web Server ] 11/08/2017
Digital AlphaServer 2100 4/275
The Digital Equipment Corp AlphaServer 2100 series model 4/275. This AlphaServer is powered by an Alpha 21064A microprocessor. Features include a 275-MHz CPU with 4 Mbyte cache; Click image for larger view.
So far the system powers up, initializes and then fails to load an operating system. This machine would have been shipped with OpenVMS, Digital UNIX or Windows NT. Click image to see larger view.
M... [ read more ]

Digital VAX 4000-200

by billdeg - 04/27/2015
Total messages in this thread: 20
Last Post: [ Updating User Disk Quota ] 11/06/2017
The Digital VAX 4000-200
The Digital VAX 4000-200. Click for larger image.
The Digital VAX 4000-200 SHOW DEV Output
The SHOW DEV Output. Click for larger image.
... [ read more ]

For-Sale / Items Wanted

by billdeg - 11/04/2017
Total messages in this thread: 1
NOTE: date of thread = the last update date. Note there are some old specific item for-sale threads on this site. If they're not linked from here, they're probably expired/sold. I have a lot of extra Digital / DEC stuff available at the moment. VAX 4000-60 VAXStation 3100 RK06 Alignment Catridge RL01 Cartridges DEC Rainbow parts UNIBUS Regulators More! FOR SALE Kilobaud (Microcomputing) Magazines - Nearly complete set - $lets make a deal Computer Products Co DEC-compatible logic boards later 70's early 80's era stuff PDP 11/44 Mostly Commodore and Tandy stuff here History of Commodore Poster Items Wanted [ read more ]

Commodore VIC-21

by billdeg - 11/04/2017
Total messages in this thread: 1
Commodore VIC-21
Yes there is such thing as a Commodore VIC-21. Pictured is the box. Click image for larger view.
http://ww...kb/secret/supervic.html... [ read more ]

Digital DEC 3000/500

by billdeg - 05/15/2017
Total messages in this thread: 3
Last Post: [ Hacking in ] 10/28/2017
DEC 3000/500 with front and top cover removed.
DEC 3000/500 with front and top cover removed. Click image for more photos
Amazingly I have the cables, I will need to borrow a SGI or similar display as the VR241 I attempted was not able to synch with the display controller. I even have an old dirty mouse that should work with it.... [ read more ]

DEC VX40 Multia

by billdeg - 05/14/2017
Total messages in this thread: 2
Last Post: [ DEC UNIX 4 hacking for Root Access ] 10/28/2017
Digital VX40 Multia
This tiny (~10 inches wide) DEC VX40 Multia stared out as a VX40B and was field upgraded to a VX40L-F2 . Click image to see files
Digital VX40 boot screen
Boots up like a typical Alpha from the mid 90's. This system has VMUNIX installed but I have not yet cracked it to get access. Click image to see larger view.
See boot screen succession snapshots. If you the reader have experience with this hardware or have any comments please contact me. More to come.... [ read more ]

RK11-D Installation

by billdeg - 06/27/2017
Total messages in this thread: 3
Last Post: [ Photos Installed RK05 ] 10/23/2017
Digital RK05 disk packs
Digital RK05 disk packs. Click image for larger view.
I have the RK05 card set and backplane RK11-D. Picture: htt...11D-MM-002.pdf Cards and Backplane (minus UNIBUS cables): http://www.tec...ontroller.jpg RK11-D is a 4-card backplane RK11-D RK05 Disk Controller EK-RK11D-MM-002 M7254 Status Control M7255 Disk Control M7256 Registers M7257 Bus Control... [ read more ]

Front Panels! (... but no computer)

by billdeg - 05/12/2017
Total messages in this thread: 4
Last Post: [ Photo of Varian 620L ] 10/23/2017
Varian Data Machines 620/L front panel
The Varian Data Machines 620/L Front Panel, circa 1970. Click image for larger view.
Burroughs B1700 front panel
Here is a early 1970's Burroughs B1700 Front Panel. Click image for larger view.
Unidentified DEC UNIBUS MASP panel.
Unidentified DEC UNIBUS MASP panel. Click image for larger view.
The following are not computer fr... [ read more ]

Large-Scale Systems Museum (phone pics)

by billdeg - 10/23/2017
Total messages in this thread: 1
I think we found the right place. My phone camera is only so-so at object photography, but I did get a few usable photos. Next time I visit I plan to bring a good camera and include photos of the equally-wonderful 2nd floor, not pictured in this set. Click image for larger view.
The Varian 620L. This is the system behind the front panel I have from This thread. Click image for larger view.
Digital... [ read more ]

Digitial MicroVAX 3100 30 System

by billdeg - 04/10/2015
Total messages in this thread: 21
Last Post: [ Post Script ] 10/20/2017
MicroVAX 3100 with Storage Expansion
Pictured here is a 1988 (?) Digital MicroVAX 3100 with Storage Expansion boxes. The model number of the 3100 is DV-31BT4-A-A01 which I believe makes it a 3100 model 30. The storage expansion boxes are basically external SCSI hard drives. Their model numbers are DV-31BT4-A-A01(middle) and SZ123-XA (bottom). Click image for larger view.
Show Dev command VAX output
So far I have not done much other than boot the system from the console and run a SHOW DEV command to see what the VMS/VMB assignments are. The system is runnin... [ read more ]
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