Commodore 16 Power Supply Repair

Defect:

• Output voltage in short circuit.

Replaced parts:

• Replaced 1 x 4700uf / 16v Electrolytic capacitor.
• Replaced 1 x 800mA Bridge rectifier.

Atari 2600 Repair

Defect:

• The second joystick port doesn’t works properly.

Replaced parts:

• Replaced 1 x 6532 RAM-I/O-Timer (RIOT)

This is another adapter (here the previous one) to replace the MPS 6550 RAM. This adapter replace a single MPS 6550 RAM chip in a Commodore PET 2001 with a standard 2114 RAM chip.

source: dasarodesigns.com

Commodore CBM 4032 (40 Columns) Repair

Defect:

• “Device not present” error when using the IEEE 488 port (Example Floppy Drive)
• Sometimes the computer show the prompt of the TIM monitor (Machine Language Monitor program)

Replaced parts:

• Replaced 1 x IC 6522 VIA (UB15)
• Replaced 1 x IC 6520 PIA (UB16)

Gallery:

This adapter replaces all ram installed in the Commodore PET 2001 with a 6264 Static Ram and is useful when one or more ram are faulty. These type of ram are no longer available to purchase.

NOTE: This adapter will only work to replace a chip with a part number starting with MPS 6550. They will NOT replace other RAM types used in Commodore computers other than the original Commodore PET 2001.

The original design was done by Donni of the VCF forum (Vintage Computer Forums).

Unfortunately these pcb have a design problem, below the fix which needs to be done (i always forgot to post this fix, sorry)

Download: Original printable version by Donni (1424)

Gallery:

Restoration the external case of the Micro Peripherals Ltd Floppy Disk Drive that was eaten by rust.

This is a screenshot from the Talk, a demonstration made by a Friend to explain how they worked the BBS. On the photo “Hidden Power / Nightfall WHQ’

A new demo for Commodore 64 by Algorithm/Onslaught.

Download: Variable Offset Amplitude (VOA) by Algorithm (1224)

source: csdb.dk

CBM prg Studio Version 3.1.0 is released. There are a lot of new features in this version. I’d really appreciate it if you report any bugs you find or have any suggestions/comments.

CBM prg Studio allows you to type a BASIC or Machine Code program in using a nice Windows environment and convert it to a ‘.prg’ file which you can run on an emulator, or even a real C64 / VIC20 or PET if you’re feeling brave and have the right kit.

CBM prg Studio is the result of merging C64PrgGen and VIC20PrgGen. Adding new features and fixing bugs in two apps which were 95% similar was a bit of a nightmare so merging them made sense.

It was also a good opportunity for a face lift and to add some new features, such as:

• Programs are project based, meaning all related source files, sprite files etc. are kept in one place and multiple source files can be linked more easily.
• Tabbed MDI.
• Syntax highlighting.

What CBM prg Studio isn’t is a front-end for tok64, cbmcnvrt, bastext or any other tokeniser / detokeniser / assembler. It’s all been written completely from scratch.

New features:

• Code Snippets.
• Improved VICE debugger support.
• New tutorial for mixing BASIC and machine code.
• Support for the Plus/4 in the screen code builder tool.
• Syntax colouring can be disabled.
• BASIC 8 support for C128 projects.
• Return to ‘jump to destination’ in basic programs.

Bug Fixed:

• Assembler:
  • Zero page optimisation ignored if address contained arithmetic.
  • Arithmetic with cheap labels ignored.
  • GenerateTo ignored if wrapped in ifdef..endif
  • Arithmetic would fail if using binary variables.
  • Unknown labels in WORD sequences ignored.
  • Incbin would fail with certain parameters and comments.
  • Problems generating a .prg to a disk image.

• Screen Designer:
  • 1×1 rectangle could throw exception in screen designers box tool.
  • Mixed mode (multicolour and hires) screen designer (VIC20).
  • Fill for rectangle tool.

• Debugger:
  • SBC, ADC and RTI instructions not working.
  • Improved cycle counting.

Download: CBM prg Studio v3.1.0 (1234)

source: ajordison.co.uk

I must thank my dear friend Andrea and all friends which have contributed to the growth of my Repair Laboratory with donations of spare parts.

Donated items:

• 1 x Commodore 128
• 2 x Sinclair QL
• 1 x Sinclair ZX Spectrum +
• 1 x Spectravideo SV-318
• 1 x Sinclair ZX Spectrum +2
• 1 x Philips MSX VG-8010
• 1 x Philips MSX VG-8020
• 1 x Olivetti Prodest PC 128
• 2 x Olivetti Prodest PC 128/S
• 1 x Amstrad CPC 464
• 1 x Amiga 600 without Floppy Drive
• 1 x Commodore CDTV
• 1 x Atari Floppy Drive 1050
• 1 x Atari Tape Recorder 1010
• 1 x 512k Expander Ram from Miracle for Sinclair QL
• 2 x Floppy Disk Drive 3.5″ for Sinclair QL (*)
• 1 x QLFDC Floppy Disk Drive Interface v5.1 from Miracle for Sinclair QL
• 1 x Floppy Disk Drive 3″ + Interface for Sinclair QL
• 1 x Centronics Interface for Sinclair QL
• 1 x Power Supply for 3.5″ Floppy Disk Drive
• 2 x Cables

(*) Needs to be made a Aesthetic Restoration.

Gallery:

Cleaning the keyboard keys is really tedious.

Gallery:

12►

Commodore CBM(PET) 4032 (FAT40) / 8032 Cathode Ray Tube (CRT) Replacement.

The cathode ray tube was taken from the Amstrad GT-65 (Monochrome monitor)

The CRT Tube Orion 310GNB31 (Amstrad GT-65) is fully compatible with the Amperex M31-334GH (CBM 4032/FAT40 – 8032).

NOTE: The same CRT work perfectly for the computer Radio Shack TRS-80 Model 3 and Model 4.

Some new games or tools (Cracked / Trained or Unrealeased) for Commodore 64 have been released from your favorites groups.

Titles:

• Get to the End Preview V2+
• Bugs +2D
• 8bit Fighters Preview
• Dark Force – Redux
• Magic Duel (16KB Cartridge Version) +F [pal/ntsc]
• Magic Duel (DoReCo Edition 2014) +F [pal/ntsc]
• Get to the End Preview V2 +
• Alter Ego 101% +5
• Onslaught Shooter Collection [Easyflash]
• Alter Ego +21D +Fix
• Tusker 101% +7DFIR & Easyflash
• Super Pac Twins (Special Edition) 101% +5F [pal/ntsc]
• Action Biker +36D
• Maze of the Mummy Preview
• Electro Gates -Preview-
• Boxmatch +2H
• Roll +3HD
• Dead Zone +8D
• Warflame RX +2
• Lunar Blitz RX
• Lunar Blitz RX +3HF [pal/ntsc]
• Bozo’s Night Out +7D +PIC

Download: All Games in One Archive (3367)

source: csdb.dk

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 v3.3.0 (Windows/OSx/Linux) (1173)

source: popelganda.de

Gallery of the repair:

Texas Instruments TI-99/4A Repair (#1)

Defect:

• Blue Screen with tiny Vertical lines.

Replaced parts:

• 1 x MCM6810P (128 x 8-Bit Random-Access Memory TTL/DTL)

Texas Instruments TI-99/4A Repair (#2)

Defect:

• Blue Screen with tiny Vertical lines.
• Wave/Raster Lines.

Replaced parts:

• 2 x IC MCM6810P (128 x 8-Bit Random-Access Memory TTL/DTL)
• 1 x IC CD3236A-NL (ROM)
• 1 x Capacitor 12 pF.

Note:

In one photo you can see the curious change made in this TI-99/4A by inserting a resistor in the pitch where in other motherboards is soldered a leg of a electrolytic capacitor and then one leg of the capacitor is welded and the not the other leg.  Compliments.

Video of the defects: