Search Posts:

CBM KIM-1 Rev G Restoration

SHARE

Return to Threads

  CBM KIM-1 Rev G Restoration by Bill Degnan - 05/19/2013 10:27

Started project to restore a non-functioning Commodore Kim-1 (Rev G). Working with a number of attendees at the Spring MARCH workshop we concluded that the 6502 socket was bad. I also replaced the dual timer chip in U25.


More to come.

Reply
  KIM U1 Socket Replaced by Bill Degnan - 07/08/2013 10:36
Removed the 6502 socket (U1) and discovered a lot of scratches which might explain why we're not getting the right signals, seems like they have created a short in the board.


Reply
  Another KIM walks again by Bill Degnan - 08/26/2014 13:16
I had extensively worked through the other KIM I have (KIM rev D thread which gave me new knowledge to test this one as well.

Most important, I learned one must ground pin K on the application connector even if not applying 12V power.

The repairs I made to the socket and other little cleanup I did to bring the KIM-G back to life (don't remember everything) may have helped or may not have been necessary. The machine sprang to life with pin K grounded; the ROMs return the correct values. I need to do more testing, but this is a great step forward.


Reply
  Photos Commodore KIM-1 Rev G by Bill Degnan - 08/27/2014 10:27
Commodore KIM-1 Rev G
Yes this is the Commodore KIM-1 Rev G from the poster I produced in 2006. Click image for larger view.


Power leads attached to application connector of KIM-1
Photo of the power leads I added to the application connector. I can disconnect these leads safely without removing the application connector adapter each time. Click image for larger view.


LED display Commodore KIM-1
Here's an image of the LED display. click image for larger view.


Commodore KIM-1 rev G powered on
View of the KIM-1 powered on. Click image for larger view.


More Photos


Reply

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:


    HIDIC 100 cover

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