Repair Apple II EuroPlus.

This computer has taken a lot of moisture and temperature changes, it can be seen because the connectors (Apple BUS) have dried up and the plastic tends to break. In addition, some pins of the ICs are rusty, fortunately few.

The main problem of this computer, as well the removal of the usual filter capacitor inside the power supply, was that don’t accepts some basic commands (see photo)

The problem was caused by the malfunction of the PROM 341-0014. (E8)

The owner will have to decide whether to purchase the original PROM (current price €13,90 + Shipping) or use a horrible adapter to insert an EPROM 27C16 (2716) in place of a PROM.

This adapter in addition to changing the aesthetics of the original motherboard brings with it some problems.

• 16k language card don’t work.
• Long cards which extend to the part of the circuit board cannot be used.

Gallery of the repair:

source: willegal.net classic-computers.org.nz

It was released a new OS Update for the Everdrive N64 Flash Cartridge (Nintendo 64) by Krikzz. The upgrade instructions can be found here.

Changelog:

• 2.09 (21.01.2015)
  • “CRC Check” option to enable/disable CRC check
  • FPGA code update

• 2.08 (14.11.2014)
  • Minor fix of bootcode

• 2.07 (12.11.2014)
  • Fixed “Self test” menu

• 2.06 (12.11.2014)
  • Fully functional GameShark. Special thanks to Parasyte and Modman for new GS core!
  • Automatic save and loading GS codes when user change the game. “Auto cheat” option should be enabled
  • Fixed graphics bug in “RTC setup” menu (ED64 V3)

Download: Everdrive N64 - OS Update v2.09 (1428)

source: krikzz.com

This Commodore 64 was found in the trash from a friend, although aesthetically in a good state, the computer doesn’t work.

Defect:

Sorry, this entry is only available in Italian.

Scene World is a C64 magazine on disk dedicated to various activities of both C64 scenes.

“Both” means, that we are supplying information and texts of both scenes; NTSC and PAL.

Download: Scene World #24 (1456)

source: sceneworld.org

Relaunch64 is an IDE (text-editor) for C64 assembler-coding on Windows, Linux and Mac OS X. Relaunch64 has a clean and intuitive user interface, yet it offers many features that make coding faster and easier.

Java 7 or higher is required to run Relaunch64. The program is licensed under the GNU GPL 3 (or higher) and free for private and professional use.

This editor works together with common cross assemblers like Kick Assembler, ACME, or 64tass. Other assemblers might work as well, but syntax highlighting may not be 100% correct.

Download: Relaunch64 v3.3.2 (Windows/OSx/Linux) (1504)

source: popelganda.de

I lost too much time to repair only one of two psu, not convenient. Better to replace only the PCB with a ATX power supply (only the PCB!)

Defect:

• Dead.

Replaced components:

• 2 x Diode IN4001
• 1 x Diode Zener 5v1
• 1 x Triac BTB 16 200B (recovered from another power supply)
• 6 x Electrolytic Capacitors.
• 1 x Power supply plug with a filter RIFA inside.

Download: Commodore 65 High Resolution Photo from the auction (1635)

source: ebay.fr wikipedia

Click to view original size

I have repaired last year these computers for a dear friend.

Commodore 64 #1

Defect:

• Black Screen.

Replaced parts:

• Replaced 4 x 4264 RAM (U9,U10,U11,U12)

Commodore 64 #2

Defect:

• Out of Memory.
• Expansion Port (Cartridge) don’t works.

Replaced parts:

• Replaced 3 x 4264 RAM (U12,U24,U22)
• PCB track interrupted of the expansion port (A5 Address Line). Fixed with a bridge.

Commodore 64 #3

Defect:

• Garbled screen and then Out of Memory.

Replaced parts:

• Replaced 4 x 4264 RAM (U24,U12)
• Replaced 1 x 74LS257 Data Selectors/Multiplexers (U13)

Commodore 64 #4

Defect:

• Black Screen and then Out of Memory.
• No Sound.

Replaced parts:

• Replaced 2 x 4264 RAM (U9,U10)
• Replaced 1 x 74LS257 Data Selectors/Multiplexers (U25)
• Replaced 1 x 6581 SID (U18)

Read more…

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I have repaired last year these computers for a dear friend.

Commodore 128 #1

Defect:

• Black Screen.
• Missing CAS on PIN 1-4 of the 74LS32 (U9)
• Missing CHROMA video.

Fix:

• To fix the problem of lack CAS on 74LS32 i had to make a bridge from the PIN 41 of the PLA 8721 because a pcb track under the socket was interrupted.
• Broken solder joints on the RF Modulator.

Commodore 128 #2

Defect:

• Black Screen but sometimes it works.

Replaced parts:

• Replaced the socket of the 8721 PLA.
• Replaced 8721 PLA (U11).

Note:

The main problem was the PLA. In the C128 mode sometimes works and sometimes not. Works always C64 mode.