My first computer, I enjoy repairing and modifying these. Hopefully keeping track of my progress will actually inspire me to get these all done.

Serial No. S00031606

Very low serial number, 326298 board, Revision A. Bought second hand in College Station, TX. It’s clearly been refurbished once before. The DIN sockets and RF box were re-soldered, VIC-II replaced, PLA replaced, and there’s a jumper cable on U20.

Missing the RF box top shield, VIC-II shield box came loose. Corroded capacitors.

U1 (CIA): 6526 “1982” U2 (CIA): 6526 “1982” U3 (BASIC ROM): 901226-01 2682 U4 (KERNAL ROM): 901227-01 3082 U5 (Character ROM): 94132C-2177 “1982” U7 (CPU): 6510 1882 U17 (PLA): Sticker on top of IC says “C64 REV3 8411” U18 (SID): 6581 2382 U19 (VIC-II): 6567R8 2684

Todo: Recap, socket, restore to original condition and preserve.

Serial No. SC0156082

Bottom says “Made in Canada”. 250407 board, Version A, Revision B. Ceramic VIC-II.

Replaced bad CIA’s (6526R4’s, 2083) with 6526’s (0483/1483).

Replaced capacitors:

  • C19 (16v 2200uF) w/ 16v 2200uF
  • C88 (50v 470uF) w/ ChongX 50v 470uF
  • C90 (50v 470uF) w/ ChongX 50v 470uF
  • C91 (16v 100uF) w/ 25v 100uF
  • C107 (25v 10uF) w/ 25v 10uF
  • C108 (25v 10uF) w/ 25v 10uF
  • All others (25v 10uF) w/ 50v 10uF

Installed metal heatsinks on all IC’s.

Installed SD2IEC Internal w/ mounting bracket. I’m not sure if I got this printed with the wrong type of plastic or what, but the retaining brace at the end of the bracket snapped off very easily. I’ve held it all together with hot glue, which seems to work for now, but I might need to upgrade to something that binds better (such as superglue or epoxy).

  • Blue: +5V
  • Purple: Ground
  • Grey: IEC Attention
  • White: IEC Clock
  • Black: IEC Data

This machine is my main go-to machine when playing games. Used in combination with a Framemeister.

Todo: Replace the unused RF box with something like RFOUT!

This machine also has some weird problems with color changes happening every now and then. It also doesn’t load things correctly 100% of the time. I suspect this might be a problem with the 74LS373, similar to Jan Beta’s issue here.

Serial No. P00690784

250407 board, Version A, Revision B.

Missing PLA and SID. Some rust, mostly on the RF box, and has screws that penetrated through the bottom plastic shell.

Todo: Might be a candidate to fix and replace the RF box with something modern?

Serial No. P01426344

250407 board, Version A, Revision B.

Untested. Lots of unsocketed chips here.

Serial No. P01568379

250407 board, Version A, Revision C.

Fails the dead test.

Serial No. P01618548

250407 board, Version A, Revision C.

Passes the dead test, but no video.

Serial No. P01625103

250407 board, Version A, Revision C.

Fails the dead test, no video. In good condition.

Todo: Diagnose and fix.

Serial No. P02069119

250407 board, Version A, Revision A.

Passes all tests. In good condition.

Serial No. P02081021

250425 board made in Hong Kong, Version B. Has piggybacked diodes on R29 and R30.

Bad RAM. Missing the VIC cover box.

Todo: A lot of chips without sockets, so probably need to re-socket everything.

Serial No. P02387457

250425 board, missing the PLA. No RF shield/heatsink. Untested.

Serial No. P02395981

Has a sticker on it that says “dead IEC bus”, but I haven’t tested it yet.

Serial No. P05246675 “B”

Empty shell, no idea where the board went. It was probably a 250425 based on the serial number.

Serial No. P05247967 “B”

250425 board, has some busted pastic underneath. Metal RF shield/heat skinks intact.