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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 ]

CBM 2001-16B (PET)

by billdeg
Total messages in this thread: 1
Commodore PET 2001-16B upgraded with 16K more RAM and a SM-KIT programmer's productivity kit ROM. Donation to Kennett Classic by Alan Walter. Click image for larger view.
Not CBM-branded but this is the Livermore Labs Star 488 IEEE Modem and software that was OEM'd as the CBM 8010 IEEE modem. Click image for larger view.
A nice copy of PET Microchess. Click image for larger view.
Click for more photos NEXT:">... [ read more ]

Relay Moe Plays Tic Tac Toe 1956

by billdeg
Total messages in this thread: 1
Relay Moe is an early electronic game programmed to play Tic Tac Toe, 1956, article by computing pioneer Edmund C. Berkeley
A scan of one of the Radio Electronics magazine covers on site at Kennett Classic in Kennett Square, PA.">... [ read more ]

setting reply-to VMS Mail with MULTINET

by billdeg
Total messages in this thread: 2
Updated: [ Permanently set MULTINET_SMTP_REPLY_TO ] 10/03/2019
Introduction to VAX/VMS Manual Cover
Cover of the Introduction to VAX/VMS Manual 1987
Peter Coughlin writes: "... Specifying the REPLY_TO Header The MULTINET_SMTP_REPLY_TO logical name lets you specify the value for the RFC822 REPLY-TO: header. For example to set your Reply-To: header to FNORD@FLOWERS.COM, use the command: $ DEFINE MULTINET_SMTP_REPLY_TO "FNORD@FLOWERS.COM" This logical name only affects mail agents that use the SMTP% interface (for example OpenVMS and DECWindows mail). Endquote. In case it is not clear, you should define this logical name in DCL before you run VMS MAIL and it will then apply when you send mail to an address prefixed by SMTP%. I will add that you could probably use DEFINE /SYSTEM if you want this to apply to all users on the system or you coul">... [ read more ]

1966 GE/Pac 4000 Small Process Computer

by billdeg
Total messages in this thread: 1
The General ELectric Process Automation Computer - GE/Pac 4000. Click image for larger view.
Download Product Brochure">... [ read more ]

PDP 11/40 M7234 TIMING CPU Card Fail

by billdeg
Total messages in this thread: 1
PDP 11/40 TIMING module DEC 5380 SN20628N 2-input NOR removed
Closeup of a PDP 11/40 TIMING controller card, M7234 where a Dual NOR DEC 5380 SN20628N 2-input NOR chip has been removed. It caught fire. A replacement chip was pulled from donor M7234 and the card appears to be working correctly again. Click image for larger view.
Full disclosure - I accidentally plugged the M7234 into the wrong UNIBUS CPU backplane slot, ug. Too much juice to the chip fried it. Using three sets of 11/40 CPU controller cards I had been swapping cards around in the effort to get an EIS CPU card (M7238) running. The EIS is necessary to boot UNIX but I have been unsuccessful in finding a working set of">... [ read more ]

Iowa State 1957 IBM 650, Cyclone 1

by billdeg
Total messages in this thread: 1
Iowa State College Progress report No 1
Iowa State rented an IBM 650 and went live in February 1957. The implementation team published a report on their progress, lead by T. A. Bancroft Director, Statistical Laboratory; Chairman, Working Committee for the Improvement of Computational Facilities at Iowa State College
"...After much careful study, an interdepartmental "Working Committee for Improvement of Computational Facilities at Iowa State College" recomĀ­mended, early in 1956, both the rental of an IBM 650 at a 60% educational discount and the construction of a digital computer for which the llliac at the University of Illinois would serve as prototype. The IBM 650 was inĀ­stalled on February 7, 1957 and has now been in continuous service for over two years. Construction of the Cyclone, ISC'">... [ read more ]

Cromemco System Three Revisited

by billdeg
Total messages in this thread: 1
Cromemco System 3 Three Disk Drive Interface Controller
Pictured is the drive signal/power interface board installed in the chassis of the Cromemco System Three. This board is used to route power to the Persci 299 twin 8" drives, and I believe the drive controller signals. Visually inspect the board. Can you guess what's wrong with this picture? Click image for larger view.
Cromemco System 3 Three Disk Drive Interface Controller 2000uf cap
This photo does a better job to display the problem, the 2000uf 50v cap has blown">... [ read more ]

PDP-11 Still Going Strong

by billdeg
Total messages in this thread: 1
DEC PROFESSIONAL Letter to Editor PDP-11 Still Going Strong
From the Letters section of an un-dated clipping, DEC PROFESSIONAL magazine Spring House, PA. Click image to download PDF
This short letter offers an interesting perspective of the DEC Professional in the late 1980's. Being that many DEC machines are still functional today it would be very believable that a person would choose to continue to use their UNIBUS system, especially an 11/44 into the 1990's. If I was to guess I'd say this letter was published in early 1987.">... [ read more ]
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