Search Posts:

Latest Projects:

Atari 400 With 32/48K RAM Expansion

by billdeg
Total messages in this thread: 1
Atari 400 homebrew RAM expansion front. Click image for larger view.
Unlike modern RAM upgrades, this one is an actual vintage wire-wrapped 48K upgrade constructed in 1981 or so.
Atari 400 homebrew RAM expansion obverse. Note the wirewrap connections and pin 4 has been cut. Click image for larger view.
The wire jumpers added to the motherboard to allo">... [ 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) Findex portable computer (any model) PCS Micropac 80, Superpac 180 and related DVW Microelectronics Husky 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, Compucolor II, HAL, Jupiter Computers Commo">... [ read more ]

1976 DATAC 1000 6502 Training Computer

by billdeg
Total messages in this thread: 1
The DATAC 1000 was designed by Philadelphia Area Computing Society (PACS) members Carmen DiCamillo and Roland James in 1976. In its original form the DATAC 1000 was a single board 6502 microcomputer trainer that included a training course for beginning computer engineering students to use to learn about 6502 microprocessor systems design. Click image for larger view.
It is likely the DATAC 1000 was demoed by PACS at the PC'76 personal computing consumer trade fair in Atlantic City, NJ, alongside the Apple, MITS, Processor Technologies and other pioneering vendors of the time (AUG 28-29 1976). PACS would also host instruction sessions internally that featured the DATAC 1000 and at least one local college (Drexel University) used them, possibly other schools as">... [ read more ]

Heathkit Tube Checker Model TC-3

by billdeg
Total messages in this thread: 1
[image pending] circ. 1958-1961 1. Use the rolling tube testing settings chart 2. Set all of the levers to the center position 2.5 Move the SET LINE dial clockwise to turn on the unit and stop when the needle points to 50. Switch the short/leakage switch to short 3. Set the Type, Filament, Plate dials to match the tube type. Note that many tubes have two test combinations 4. Move paddles in the Top column up, the Bottom column down and leave the others in the middle 5. insert the tube in the appropriate tube holder 6. Let the tube warm up. 7. Press down the short adjust line lever to the test position. Does the needle display move into the GOOD area? If so the tube is good. If the short light comes on or the needle points to the BAD side, the tube is bad. 8. Move the short/leakage switch into the leakage position and repeat the test. 9. If the tube">... [ read more ]

Kaypro II

by billdeg
Total messages in this thread: 2
Updated: [ Mystery Restistor ] 03/05/2022
As soon as I saw this raised socket I knew this was not a stock Kaypro II, but other than raising the Z80-PIO chip what else is different? Click image for larger view.
This Kaypro II was donated to Kennett Classic and does not boot, disk drive is not detected. Should be fixable. James Palic, the original owner of this portable computer writes: "...Online Consulting is the name of the company that I and my partner started nearly 40 years ago after we left Dupont. Initially we sold Kaypro and other computer hardware. Someone showed us how to modify the boot ROM to have our company name show when booting. Online Consulting is still around but we're now known by our DBA - ONLC Training Centers. That particular Kaypro is a ve">... [ read more ]

Bigger Apple II PEEK, POKE and CALL List

by billdeg
Total messages in this thread: 1
For my own reference and maybe yours... https://apple2...---------------- APPLE CALL, PEEK, POKE LIST CALL 144 SCAN THE INPUT BUFFER CALL 151 ENTER THE MONITOR NORM APPLE CALL, PEEK, POKE LIST ------------------------------------------------------------------------------ CALL -144 SCAN THE INPUT BUFFER CALL -151 ENTER THE MONITOR NORMALLY CALL -155 ENTER THE MONITOR & SOUND BELL CALL -167 ENTER MONITOR AND RESET CALL -198 RING BELL (SIMULATE CONTROL G) CALL -211 PRINT "ERR" AND RING BELL CALL -259 READ FROM TAPE CALL -310 WRITE TO TAPE CALL -321 DISPLAYS A, S, Y, P, & S REGISTERS CALL -380 SET NORMAL VIDEO MODE CALL -384 SET INVERSE VIDEO MODE CALL -415 DISASSEMBLE 20 INST">... [ read more ]

IBM 3270 PC (Model 5271)

by billdeg
Total messages in this thread: 2
Updated: [ MAXIMIZER troubleshootung ] 02/23/2022
The IBM 3270 PC, model 5271 after repairs made to the RAM. Click image for larger view.
View of display connector cable attachment to rear of IBM 5271. Note the dual card. Note also the RAM expansion card has been removed for troubleshooting. Click image for larger view.
The display paired with the 3270 PC (part no. 5272)running a color calibration program. Click image for larger view.
More photos This computer was donated to Kennett Classic. I">... [ read more ]

Digital TU56 for PDP-9

by billdeg
Total messages in this thread: 1
View of a recently donated TU 56 dual tape drive, prior to any restoration efforts. Click image for larger view.
This end goes to the PDP-9 (!). Click image for larger view.
More photos">... [ read more ]

DEC VX40 Multia

by billdeg
Total messages in this thread: 3
Updated: [ Better Login ] 01/21/2022
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 ]

1979 HAL DS-2000 KSR

by billdeg
Total messages in this thread: 1
The HAL Communications Corp HAL DS2000 KSR smart terminal. Click on image for larger view.
The manual refers to this BMC monitor, so I assume it was purchased along with the KSR unit. Click on image for larger view.
Here is a nice big pic of the boards and wiring view, with the case open. Click on image for larger view.
More pics What's next? Attach it to a computer expecting a current loop as if the HAL were a Teletype. There is also Morse code and Baudout communications.">... [ read more ]

UNIVAC 1 and UNIVAC File Computer 1

by billdeg
Total messages in this thread: 2
Updated: [ UNIVAC 60 / 120 modules and 5823 tubes ] 08/23/2021
UNIVAC I and UNIVAC File Computer components
The two long modules in the back are from a UNIVAC 1 that was located in New York State. The UNISERVO tape is from DuPont and the drum memory component is from a UNIVAC File Computer Model 1. Click on image for larger view.
To see more photos of the UNIVAC I and UNIVAC I File Server components stop by Kennett Classic or click here. See page 34 of http://www.bitsavers.org...enance_Manual_Jan58.pdf">... [ read more ]

Osborne 1 (b) with RAM Drive

by billdeg
Total messages in this thread: 2
Updated: [ Keyboard Replaced ] 06/11/2021
This Osborne 1b (later models came with with the "bluer trim") includes an innovative external display prosthetic device designed to hold the monitor level on top of the computer while in use. Click image for larger view.
Here is another view of the system. Click image for larger view.
This "Drive C:" expansion unit fits into the disk holder of the computer and functions a">... [ read more ]

MICRO Index

by billdeg
Total messages in this thread: 1
Click image to download MICRO Index of articles sorted by system.
At Kennett Classic we have a complete (or near complete) run of MICRO journals. These along with a whole lot more will be available in our library room by the end of the summer. MICRO first appeared in 1977 and it caters to the Apple, AIM, SYM, KIM, Atari, OSI and PET developer. In their own words, MICRO is "the technical reference journal which reports monthly on the development and practical abd theoretical application of new 6502 microcomputer technology"">... [ read more ]

AST PremiumExec 386SX/20 laptop

by billdeg
Total messages in this thread: 1
An AST Premium Exec 386SX/20 laptop from about 1991. Click image for larger view.
Powers up, needs a new CMOS battery.">... [ read more ]

RDI PowerLite Sunsparc Laptop 85/110P

by billdeg
Total messages in this thread: 1
The RDI PowerLite has a microSPARC II processor and was made to run Sun OS like a Sun SparcStation 5. Click image for larger view.
Alas, struggles but does not power up. Characteristic of a power cap failure. Worth fixing, eh?">... [ read more ]
OLDER POSTS (15 threads per page): 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 |

Resources:


Buy a Commodore Computer Poster

Popular Topics and FAQs


  • Commodore B Series Tips and Tricks
  • Aerocomp TRS 80 M 1 Expansion Unit DDC
  • Items Wanted
  • Lobo Max 80
  • Zenith Z-19-CN
  • Prototype PET 2001 photo
  • Using Toggle Switches to Analyze Memory
  • Commodore Disk Archive Project
  • PET 2001 Prototype at Gametronics 1977
  • Jim Butterfield Photo
  • IMSAI 8080 With Processor Tech. Cutter
  • Secrecy is the keystone of all tyranny
  • Cromemco System Three
  • Northstar Horizon - Boot Problem
  • Computer History and Restoration Links
  • Commodore BX-256-80 - 8088 Co-processor
  • S-100 board testing with Z-80 ICE
  • Donner 3500 - an early portable computer
  • Digital (DEC) PDP 11/05 NC Assembly
  • Univac 1219 rescue
  • IMSAI 1.4 BASIC vs. MITS 8K BASIC
  • Fido BBS listing node list 6-13-1986
  • PDP 8e
  • MITS 88-2 SIO (2SIO) for BASIC
  • Visual Technology Inc Model 1050
  • Amiga 2500 Restoration
  • The Evolution Of IBM Computers
  • Replacement teletype print hammer head
  • Archiving and Copying Software 101
  • Computers Built 1940 - 1950
  • CBM B-520 (a.k.a B256-80 or B500 256)
  • RCA COSMAC Microkit
  • Commodore 64K C-116 Mods
  • MITS 8800b Turnmon 9600 baud
  • Catweasel, 8in and 5 1/4
  • Raspberry Pi as Gateway to Internet
  • Digital PDP11 late 1969 early 1970
  • PDP 11/40 72 inch cabinet model
  • PDP 11/40 Industrial 11 model
  • Digitial MicroVAX 3100 30 System
  • Digital VAX 4000-200
  • Commodore 64 / 1541 DRIVEKNOCK
  • Booting the System Using RL02 drive
  • PACS: Reflections by Kathleen Mauchly
  • Tele-Graphic Computer Systems Inc.
  • Commodore B Series SID Jukebox?
  • Installing Core into PDP 11/40
  • Setting Up OpenVMS 7.1 DNS CLERK
  • Felt-Tarrant Comptometer Model J
  • NextStation Color
  • Digital Rainbow (PC100-B2)
  • 1970 Compusad Compulogical Tutor
  • Archiving Papertapes Using DSI NC 2400
  • 1976 P.C.C. Features the MAI JOLT 6502
  • 1961 Beckman DEXTIR Computer
  • UNIVAC 1 and UNIVAC File Computer 1
  • Past Issues:


    CGRS front panel system

    This image was selected at random from the archive. Click image for more photos and files from this set.