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Commodore 64 (ASSY 250407) Repair
Commodore 64 (ASSY 250407) Repair
Defect:
- Black screen and a noisy background sound .
Repair:
- Replaced 1 x MOS 906114 (PLA) U17
- Replaced 1 x MOS 6581 (SID) U18
Commodore Amiga 500 (ASSY 312510) Repair
Commodore Amiga 500 (ASSY 312510) Repair
Defect:
- Garbage boot Screen (see photo).
Repair:
- Replaced 1 x FAT Agnus 8371
Gallery of the repair:
Commodore Amiga 600 – External Floppy Drive as DF0
Commodore Amiga 600 – External Floppy Drive as DF0.
This mod is very easy, just follow the schematic attached to this post.
Gallery:
Schematic:
Commodore A501 Leaked Battery Clock
Works that have been made:
- Cleaning the leaked acid (KONTAKT PLCC)
- Sprayed a thin layer of insulating lacquer (DUE-CI V-66)
Gallery:
Texas Instruments TI-99/4 Fixed
Texas Instruments TI-99/4 Fixed
Defect:
- Garbage screen on startup immediatly or after a couple of minutes.
Fix:
- This defect is very similar to the one of the Coleco Vision console.
The problem are the pins oxidized of the power switch, i have sprayed R-11 and the problem it’s disappeared completely.
I left turned on the computer for more than 2 hours and i have made a 50 x power cycle (ON/OFF) and the problem is no longer appeared.
Note:
I thought there had to be a VDP RAM problem with a diagnosis made remotely without having the TI-99/4 in the laboratory.
To avoid using the lame RF modulator i have used a standard Commodore 64 composite cable that works very well with a NTSC composite video output.
Gallery:
2 x Commodore 64 Repair
Commodore 64G repaired (1 of 2)
Defect:
- Black screen
Repair:
- Replaced 1 x MOS 7707 (7406) U8
Note:
- The motherboard has been repaired several times, the technician probably in a previous life was a butcher.
Commodore 64 repaired (2 of 2)
Defect:
- Garbage screen but runs programs perfectly.
Repair:
- Replaced 1 x MOS 906114 (PLA) U17
C64 Big Game Pack: Gradius +2DMFGH / Ghost Chaser +5D / Neme …
Some new games or tools (Cracked / Trained or Unrealeased) for Commodore 64 have been released from your favorites groups.
Titles:
- Kill the Alien
- Super Breakout Preview +
- Breakaway V1.1
- Hover Raider RX +2H [seuck]
- Paintress +2
- Yatzy
- Planet Golf Preview +1D
- Space Invadaz Extra Preview
- C64ColQuiz +1H
- F-Clash 64 [seuck]
- C64ColQuiz
- Blaster Twins Preview
- Die! Alien Slime +8D
- Kill the Alien +2
- Uni Games Preview V0.24
- Zetio +1DT
- Fort Django +
- Fort Django
- Iron Lord [1581,FD,HD]
- Spaceman Splorf: Planet of Doom V1.1 +2MD
- Retro Bombers Preview 1
- Color Overload
- Super JumpKick Turbo 64 (Beta)
- The Uni Games V0.3
- The Uni Games Preview V3 (CommVEx release)
- Agent-Test +2T
- Gradius +2DMFGH
- Nemesis – The Final Challenge +2DMFGH
- Croll Ship +4D
- Ghost Chaser +5D
- World Conquest
Download: All Games in One Archive (3696)
source: csdb.dk
(Italian) Jurassic News numero #59
Sorry, this entry is only available in Italian.
Japanese Commodore 64
The Japanese Commodore 64 was introduced in the 1983.
The Hardware somewhat different (and incompatible) Kernal and BASIC to accomodate Japanese katakana characters, 46 total (plus punctuation, diacritics, etc.); many graphic characters replaced in the Char ROM with the new Japanese characters.
Breadbox case and original brown keycaps; SHIFT-LOCK replaced with C= LOCK for the purpose of getting at the katakana; modified keycaps to show the new characters with the colour keys no longer present and the remaining graphic characters significantly rearranged.
Machine started up in English but different colour scheme and only 36863 bytes free; see screenshot. Both Markus and On the Edge remember the original screen as black on pink, but the screenshot and corresponding ROM definitely aren’t.
Graphics and Sound Identical to the breadbox 64.
Gallery:
Commodore 64 with a wrong keycap
Directly from the collection of a dear friend “Andrea Pierdomenico” the Commodore 64 with the wrong key.
The factory was wrong to print the “8″ key but only the upper label and not the front label. I did not find any articles on the net that talks about this keyboard, the only one in the world?
Gallery:
High Voltage SID Collection Update #65
The High Voltage SID Collection (HVSC) is a freeware hobby project which organises Commodore 64 music (also known as SID music) into an archive for both musicians and fans alike.
The work on the collection is done completely in the Team and contributors’ spare time and is proudly one of the largest and most accurate computer music collections known.
This update features (all approximates):
- 1022 new SIDs
- 811 fixed/better rips
- 24 repeats/bad rips eliminated
- 791 SID credit fixes
- 143 SID model/clock infos
- 59 tunes from /DEMOS/UNKNOWN/ identified
- 1 tunes from /GAMES/ identified
- 70 tunes moved out of /DEMOS/ to their composers’ directories
- 4 tunes moved out of /GAMES/ to their composers’ directories
Download:
source: www.hvsc.c64.org
4 x Commodore 64 Repair
Commodore 64C (ASSY 250469) Repair (1 of 2)
Defect:
- Garbage Screen/Auto Load/Device not Present.
Replaced parts/Fixes:
- 1 x MOS 6526 (U1)
- 2 x Diode 1n4148 (CR9/CR11)
- Rebuilt a pcb track (see photo)
Note:
- As you can see from the photo of the the broken pcb track, evidently someone did a short circuit on the IEC connector on the data lines: SRQin and DATA.
Gallery of the repair:
Commodore 64C (ASSY 250469) Repair (2 of 2)
Defect:
- Black Screen.
Replaced parts:
- 1 x MOS 8580R5 SID in short circuit (U9)
- 2 x TMS 4464 RAM (U10/U11)
Gallery of the repair:
Commodore 64 (ASSY 250407) Repair (1 of 2)
This Commodore 64 has been already repaired in years past.
Defect:
- Grabage screen/Out of Memory.
Replaced parts:
- 5 x MT 4264-15 RAM (U10/U11/U12/U21/U23)
Gallery of the repair:
Commodore 64 (ASSY 250425) Repair (2 of 2)
Defect:
- Black Screen ..then.. Grabage screen ..then (when hot).. Screen out of Sync
Replaced parts:
- 2 x MT 4264-15 RAM (U11/U23)
- 1 x MOS 901227-03 Kernel ROM (U4)
- 1 x MOS 8701 Clock Generator (U31)
Cleaning Tape and User port connectors.
Gallery of the repair:
How to adapt a new case for the Commodore Disk Drive 2031
Commodore Amiga 500+ (Battery Acid Leaked) Repair
Commodore Amiga 500+ (Battery Acid Leaked) Repair
Defect:
- Battery Leaks.
Components replaced and fixes:
- Battery Removed.
- Cleaned the PCB with PCC Kontakt
- Sprayed DUE-CI G-22 on all IC sockets.
- Made ten bridges to restore the traces corroded by the acid of the battery.
- Replaced 1 x 74LS244 (U12)
- Replaced 1 x 74LS373 (U13)
Gallery of the repair:
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