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IMSAI PCS-80/30 with Persci 277 Driveby billdeg Total messages in this thread: 2 Updated: [ Testing Perscii 277 ] 03/18/2020  This system came into Kenett Classic for repairs. The customer described how the disk does not boot. Click image for larger view.
 Here is a photo of the Persci 277 dual disk drive with the cover removed. Click image for larger view.
 The system came with a Processor Technologies Sol System Video Monitor, something I had not seen before. Click image for larger view.
">... [ read more ]
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1987 Macintosh SE Motherboard Batteryby billdeg Total messages in this thread: 1  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.
 Pictured is the motherboard battery. Change or remove? Click image for larger view.
 Remove! Just clip it out. I left the leads so I can replace in the future. Click image for larger view">... [ read more ]
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PET 2001-8 Ripple Effect Displayby 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 ]
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For-Sale / Items Wantedby 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/ |
Ohio Scientific Challenger 1P Modsby 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 ]
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SIMH Emulator - 1956 LGP-30 Computerby billdeg Total messages in this thread: 7 Updated: [ LGP-30 Arduino Simulator ] 12/08/2019  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 ]
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Commodore 2040 Drive Repairsby billdeg Total messages in this thread: 1  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.
 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.
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1966-68 Honeywell u-COMP DDP-516 Consoleby 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 ]
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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 ]
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Relay Moe Plays Tic Tac Toe 1956by 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 ]
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setting reply-to VMS Mail with MULTINETby billdeg Total messages in this thread: 2 Updated: [ Permanently set MULTINET_SMTP_REPLY_TO ] 10/03/2019  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 ]
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1966 GE/Pac 4000 Small Process Computerby 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 ]
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PDP 11/40 M7234 TIMING CPU Card Failby billdeg Total messages in this thread: 1  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 ]
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