Commodore VIC-20 (ASSY 250403) Repair
Commodore VIC-20 (ASSY 250403) Repair
Defect:
- Black Screen.
Replaced parts:
- Replaced MOS 65245 [74LS245] (UF8)
Gallery of the work done:
Commodore VIC-20 (ASSY 250403) Repair
Defect:
Replaced parts:
Gallery of the work done:
Commodore 128 (REV 310381) Repair
Defect:
Replaced parts:
Gallery of the work done:
Pioneer LaserActive CLD-A100 – Repair/Recap & Modules full Recap.
Defects:
Works that have been done:
Pioneer LaserActive CLD-A100 Gallery:
Sega Genesis/Sega CD PAC-S10 Module Gallery:
Nec PC Engine PAC-N1/N1 Module Gallery:
ZOE rev 2.0 Inty (Mattel Intellivision) RGB Interface.
Some information about this revision:
The 8-pole DIN female panel socket can be positioned, after drilling, at any place. I recommend using the RF output hole, removing the RF modulator which is no longer usable after the modification.
This mod like the previous one works ONLY with Mattel Intellivision consoles equipped with the LM1886 (D/A Video Matrix Converter) chips. Example: PAL/SECAM but not UK/NTSC (USA). Better to check, open the console and check.
For console disassembly, desoldering the LM1886 or other connections you can consult the documentation of the previous version.
Gallery:
Soon available for sale.
Phase5 CyberStorm MK2 @ 100Mhz (040 Hack – Stable)
This is a simple hack to overclock the Cyberstorm MK2 at 100Mhz without needed adapters or simply replacing the oscillator which causes instability or malfunctions.
The hack consists downgrading the Cyberstorm MK2 to 040 simply by moving the two resistors can you see marked in the photos.
For some CPU or MK2 models it is also advisable to replacing the original voltage regulator LT1085CM at 3.3v with this one LT912CM 3.5v but if the amiga is stable after hours of operation you can also avoid the replacing the voltage regulator.
Gallery of the work done:
source: Cosmos Blog
Commodore Amiga 4000 – 64Mb Fast Memory Hack.
The Amiga 4000 motherboard can be ´hacked´ to handle 64Mb of Fast Memory (4 SIMM modules of 16 MB each)
To do this, you have to solder a new GAL and make some bridges between FASTRAM SIMM -> GAL -> CHIP RAMSEY.
This work is not complicated but you need to have a good practice with the soldering iron and PLCC soldering.
Gallery of the work done:
Download: Amiga 4000 64Mb Hack (1521)
source: Cosmos Blog John Hertell Blog
Upgrading Commodore A3640 CPU Card (part two)
I have replaced the CPU 060 EC version with a 060 FULL with FPU REV 1.
When using the adapter with a non EC version of the 060 you must also use a fixed version of the kickstart v3.1 with the exec.library modified to support the FPU.
Gallery of the work done:
Download: Kickstart v3.1 Exec Patch Version for 3k & 4k - Ready to Burn! (1457)
Upgrading Commodore A3640 CPU Card (part one)
Works that have been done:
Gallery of the work done:
Commodore Amiga 4000 repair with Floppy Drive that is not recognized.
Defect:
Repair:
Gallery of the work done:
Commodore Monitor 1084S-P Repair.
Defect:
Repair:
Note:
A loud whistling noise indicates a bad flyback transformer (also known as an LOPT).
Gallery:
Download: Commodore Monitor 1084S-P Schematics (1051)
Commodore CBM 8032 (HP Early version [1980]) Motherboard Repair (ASSY 8032030)
Defect:
Repair:
Note:
As you can see from the photos this computer is already been repaired by a butcher. The butcher did not use the sockets after replacing the static ram ones and the pads had already suffered from the previous desoldering and soldering, probably using an unsuitable soldering station.
Gallery of the repair:
Commodore CBM 8032 (HP Early version [1980]) PCB Monitor Repair (ASSY 321448)
Defect:
Repair:
… and now let’s move on to the second defect. :-)
Gallery of the repair:
Video Composite modding:
Gallery of the Video Composite mod:
Sega Game Gear (Boxed) Full Recap.
Defect:
Repair:
Gallery of the repair:
Commodore 64C (ASSY 250425) Repair.
Defect:
Replaced parts:
Gallery of the repair:
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