I am very happy to have repaired for my friend four PCB Commodore in one and half hour.

The defects are:

• Motherboard Commodore 64 ASSY 250466 with IEC bus broken. (replaced ic 7406 – U8)
• Motherboard Commodore 64 ASSY 250407 with a Video Output problem with some programs, like FIBR File Manager. (replaced ic 6526 – U2)
• Motherboard Commodore 64 ASSY 250425 with strange character at startup. (replaced ic 4264 – U12)
• Motherboard Commodore Floppy 1541 ASSY 1540050 REV C with IEC bus broken. (replaced ic 7406 – UB1 and ic 7414 – UA1)

Two Commodore 64 added to my collection. The external case was bit dirty, it took me a couple of hours for a good cleaning but now the two C64 are like new.

I have found a Commodore 64 / 1541 Floppy Drive and a C16 Datassette in the trash.

The Floppy Drive was very dirty but in good working state, while the Commodore 64 was faulty (black  screen with tiny raster effect). I have replaced the video chip (MOS 6569) and is back to run better than never.

Nano SwinSID Prototype by x1541:

This project is based on the microcontroller ATMEGA88PU from Atmel and the emulation code is written by Swinkels.

The prototype of Nano SwindSID is a scaled down version of the Micro SwinSID, so far so good, and here’s my initial impression.

x1541, a user of the forum64.de has made a very nice work, the pcb has the same size of the original SID chip (6581/8580), the components are arranged very well and the entire space of the pcb was used. I can just say to buy it when the Nano SwinSID kit will be available, your money will be spent well.

Nano SwinSID Features:

• ISP Connector.
• Same size as the original SID.
• 6581/8580 Jumper.
• Smd ATmega.

source: forum64.de

This is a very old project published in a Dutch magazine to capture the state of the IRQ for Commodore 64 (vic-20) with a LED. After many years i have decided to make it.

On the photo you can see the project and the right connections on the cartridge port.

Components:

• 1 x IC 74LS04.
• 1 x Bicolor LED.
• 2 x 330 ohm resistors.

How it work? when the CPU generates an IRQ the green LED lights up, otherwise is red, if the irq is turned on and off quickly the led is orange.

Finally i had time to finish the enhancements of my Commodore 64, below a brief description of what you see in the photos.

Enhancements description:

• 1541-III bulk version.
• Reset Switch.
• Multi Kernel with Atmel flash rom.
• Multi Kernel Switch.
• Eprom homebrew PLA.
• Cartridge ON/OFF Switch.
• DualSID with separate output (6581 / 8580)
• 2 x Fan Cooling.
• Fan Cooling Switch.
• Bright Blu Power LED.
• 1541 Ultimate REV1 with v2.0 Firmware.

Autopsy:

Today i picked up two Commodore 64, both are in poor condition and Broken.

The first one with the chip SID 6581 can play a garbled sound and the closing hooks broken, the other one with the chip PLA 906114, 7406, CIA 6526 dead. I made some cleaning and repaired the problems.

DualSID KIT by Tomi Malinen:

DualSID is a device which allows you to plug in two different SID models to your Commodore 64. You can set the second SID‘s address to five different memory locations.

For more information and price visit the Tomi Malinen homepage

Autopsy:

Today i picked up a Commodore 64c Family Pack Edition with Powersupply / Datasette & Joystick in good working condition. The plastics of the Commodore 64c and Datasette are little yellowed but does not affect the right use.

Micro SwinSID KIT by Peter Sieg:

Certainly you can’t expect perfect emulation, but we are very close, the audio is much more clean than the original SID chip, if the project continues on this road we will arrive very soon on the perfect emulation.

Micro SwinSID (SwinSID88) is a hardware replacement for legendary SID sound chip which was placed in every Commodore C64 computer.

This project is based on the microcontroller ATMEGA88PU from Atmel and the emulation code is written by Swinkels. The first version of the pcb (prototype) was made by Crisp.

For more information and price visit the forum64.de.

Commodore yellowed spare parts:

• 1 x Commodore 64C (Motherboard ASSY 250407)
• 1 x Commodore 1541 II (Floppy Drive Chinon)
• 1 x Commodore Mouse 1351.

Autopsy:

Today i picked up a Commodore 64 with Powersupply in original Box and in good working condition for 13$. The plastics of the Commodore 64 / Powersupply are yellowed but does not affect the right use.

Autopsy:

Today i picked up a Commodore 64 in good working condition with Powersupply / RF Cable, Commodore 16 Datassette and a Suncom TAC2.

Autopsy:

12►

Today i picked up a Commodore 64C in original box, it is in perfect condition with no damage at all including the Manual and original Powersupply.

source: wikipedia

Autopsy:

12►

Today i picked up a Commodore 64 in original box, it is in perfect condition with no damage at all including the Manual and original Powersupply.

source: wikipedia