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Computer People for Peace

by billdeg
Total messages in this thread: 1
Click for larger image.
Archive (incomplete) mirror of an interesting collection of newsetters for a social activist group active in the late 60's early 70's and based in Brooklyn, NY. archive">... [ read more ]

SOl-20 909090 pattern fix

by billdeg
Total messages in this thread: 1
Sol-20 2012 RAM
intel 2102 RAM chips installed on the SOL-20 motherboard. Note some read equiv name AM91L02. I tested and swapped out two of these to resolve the 909090 pattern error displayed on the screen. Click to view larger view.
The last time I used my SOL-20 it was fine, other than the keyboard. I set up my SOL-20 this weekend to see how it would work with the OAE OP-80A papertape reader. I never got that far as when I fired up the machine I was greeted with a screen full of 909090 rather than a SOLOS prompt. I took a look at the troubleshooting section of the Processor Technologies Sol Systems Manual, page 250. It suggested which TTL chips to test, but I had already checked and ruled out those, so I next tested t">... [ read more ]

Items Wanted

by billdeg
Total messages in this thread: 1
This list is maintained regularly. Thread date is last update. Contact me Here. M7261 KD11-B CPU board 1 CONTROL LOGIC & MICROPROGRAMMED MODULE (PDP 11/05 or 11/10) VT-278 (DECMATE) RX278 Floppy Drive Interface Connector cable, part number is RC26N-2L. PCS Micropac 80, Superpac 180 and related DATAC 1000 6502 trainer GO Tablet Model G400 power supply or battery (24V ). Commodore B Series hi-profile keyboard(s) 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 Technology International 1108-A Manual/documentation Any mid 70's micros like the Sphere,">... [ read more ]

Collosus 1980

by billdeg
Total messages in this thread: 1
The cover of American Cinematographer April 1969. Ever seen the movie Colossus 1980?
">... [ read more ]

1980 Cromemco 3102 Terminal

by billdeg
Total messages in this thread: 1
The 1980 Cromemco 3102 terminal was made by the Beehive corporation and re-badged for Cromemco. Click image for larger view.
Pictured is the 3102 Terminal with a 1981 Cromemco System One. The terminal has a larger footprint than the computer. In real life, the terminal would sit on the desk and the computer was probably installed under the desktop in a custom enclosure. Click image for larger view.
Pictured is how one would boot from the B d">... [ read more ]

IMSAI PCS-80/30 with Persci 277 Drive

by billdeg
Total messages in this thread: 2
Updated: [ Testing Perscii 277 ] 03/18/2020
IMSAI PCS-80/30
This system came into Kenett Classic for repairs. The customer described how the disk does not boot. Click image for larger view.
IMSAI PCS-80/30
Here is a photo of the Persci 277 dual disk drive with the cover removed. Click image for larger view.
IMSAI PCS-80/30
The system came with a Processor Technologies Sol System Video Monitor, something I had not seen before. Click image for larger view.
">... [ read more ]

1987 Macintosh SE Motherboard Battery

by billdeg
Total messages in this thread: 1
Macintosh SE
The original 1987 Macintosh SE computer. SE stands for "System Expansion", which was a new feature of the small-footprint models. Click image for larger view.
Macintosh SE
Pictured is the motherboard battery. Change or remove? Click image for larger view.
Macintosh SE
Remove! Just clip it out. I left the leads so I can replace in the future. Click image for larger view">... [ read more ]

Digital DECmate VT278

by billdeg
Total messages in this thread: 4
Updated: [ OS/8 Disk created ] 02/18/2020
Digital DECmate VT278
Digital DECmate VT278 Click image for larger view.
EK-VT278 Technical Description Digital DECmate
The DECmate VT278 is a PDP 8 on a CPU / RAM board installed in a VT-100 chassis. Pictured here is the SETUP screen one sees upon successful boot. Click image for larger view.
Digital DECmat... [ read more ]

PET 2001-8 Ripple Effect Display

by billdeg
Total messages in this thread: 5
Updated: [ Repair completed ] 02/06/2020
Snapshot in mid motion. Need to diagnose cause of a rippling screen that reminds me of a flag waving in a slow wind. Click image for larger view.
See video: https://www.face...7003536391245/ Going with assumption the brightness, contrast, vertical hold are ok and the screen does not shrink. It looks like a flag slowly rippling in the wind because a cap(s) is failing but not failed entirely. Probably unrelated is the fact that I had to bang on the chassis when the system was first powered on in order to get the display to show anything. There may also be a cracked solder joint somewhere. Conclusion - The entire display needs to be worked over,">... [ read more ]

For-Sale / Items Wanted

by billdeg
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. NEC PC-6001A with cassette RK06 Alignment Disk RK06 Data Disks UNIBUS Regulators (parts / not guaranteed) More! FOR SALE We now have items for sale at Kennett Classic: https://www.kennettclass...om/ebay-listings/ href="/price_list.cfm">Mostly Commodore and Tandy stuff here History of Commodore Poster Items Wanted Free Stuff? (Varies every day. Donations held by me and not claimed by VCfed (who has first dibs) are avail you're a VCFed member. I have tons of spare cables and adapters. Pickup only) Contact me if you have a specific request. NEW indic">... [ read more ]

Ohio Scientific Challenger 1P Mods

by billdeg
Total messages in this thread: 2
Updated: [ Detailed MOD Photos ] 01/10/2020
This OSI Challenger 1P came to Kennett Classic as a donation. It has some interesting mods installed including a "BREAK/No BREAK" mod and a "Tape" mod. Click image for larger view.
A "Sup-R-Mod" has been installed so that the computer can be attached to a black and white television on channel 33. Not any TV will work, only the old style sets without a certain type of synch (forget the details) such as the pictured Sony PVJ-51RU I picked up from a computer rescue last year. Click image for larger view.
NEXT: Open the system and work through the mods, try to find matching documentat">... [ read more ]

SIMH Emulator - 1956 LGP-30 Computer

by billdeg
Total messages in this thread: 7
Updated: [ LGP-30 Arduino Simulator ] 12/08/2019
The 1956 Royal Precision Electronic Computer model LGP-30
The 1956 Royal Precision Electronic Computer model LGP-30
Making heads or tails of the LGP-30 SIMH simulator written for the Royal Precision Electronic Computer model LGP-30 is a worthy challenge for any early 21st Century computer user. Built by the Royal McBee Corporation and first sold in late 1956, this machine is mentioned by sources to be the first personal computer - i.e. the first electronic computer designed for one person to use / operate. The Friden Flexowriter is the I/O device. The Flexowriter is similar to the ASR 33 Teletype in that it included both a typewriter/printer and a papertape storage/reader function. Operational">... [ read more ]

Commodore 2040 Drive Repairs

by billdeg
Total messages in this thread: 1
Commodore CBM 2040 Disk Drive
Turned my attention to a dead CBM 2040 drive. Totally dead, no power. First thing I checked was the fuse, but it was ok. Next I checked the voltages coming into the transformer, nothing. Click image for larger view.
Commodore CBM 2040 Disk Drive
Found the problem. The person who serviced this drive whatever years ago attached one of the power switch wires to the outer post of the fuse holder, but did not make sure that there was an actual connection to the fuse itself. Almost looks like a homebrew cigar ring or something. Click image for larger view.
... [ read more ]

1966-68 Honeywell u-COMP DDP-516 Console

by billdeg
Total messages in this thread: 4
Updated: [ Datamation Nov 1966 ] 11/16/2019
Photo of a Honeywell u-COMP DDP-516 control console. The orange color scheme was used in the 1966~68 u-COMP models, see early advertisements. Many people know of the "kitchen computer", the 516 is the same thing, same instruction set as the DDP-316 (H316). If the 316 is the Kitchen Computer, the 516 is the "business" model. This console would sit on the operator's desk, or on top of the computer cabinet, which stood about 4 feet tall (need to check that). The operator would use the console buttons and switches as one would use a front panel. There is also a blue cover version of this consol">... [ read more ]

Computer Magic?

by billdeg
Total messages in this thread: 1
Cover of The LINKING RING vol 51, No. 8 August, 1971.
Computer Magic?
"... No, it's a well know face that has been precisely blurred by a computer. It's part of an experiement by Leon D. Harmon at Bell Laboratories to learn the least amount of visual information a picture may contain and still be recognizable. .." - The LINKING RING vol 51, NO. 8 August, 1971.">... [ read more ]
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