This gallery shows some stages of cleaning the Commodore CBM 8050 Dual Drive Floppy Disk. Below the defects and replacement parts.

Defect:

• Died – Status LED: RED (5 Flash) Zero page error.

Replacement parts:

• 1 x 6502
• 1 x 6532
• 1 x 6522
• The connectors of write enable sensors are inserted incorrectly.
• Missing +5v on the PCB of the sensor circuit.
• Dirtiness in the write enable sensor drive 0
• Cleaning floppy drive heads.
• Cleaning belt of the floppy drive.
• Removing the filter capacitor.
• The Analog PCB of the Floppy Drive is not fixed properly.
• The Locking screws of the external box are not original.
• Lost the felt which push the Floppy Disk vs the head.
• Disk is present (Switch Motor) dirty.
• General Cleaning.

Test formatting floppy disk:

CBM prg Studio Version 2.7.0 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:

• Debugger:
  • Keyboard shortcuts.
  • Instruction cycle counter.
  • Overlay files.
  • VICE Snapshot files (for C64 and VIC 20 only).
  • Better execution control, e.g. step over, into etc.
  • Change SP and SR registers.
  • Memory viewer.
  • Much better performance.
  • Updated tutorial.

• Character editor:
  • Edited characters indicator.
  • Copy groups of characters.
  • Scroll the scratchpad.

• BASIC:
  • Batch mode added.
  • Constants can be defined/redefined in code, and use hex values.
  • Auto line numbering inproved.

Bugs fixed:

• ‘£’ was in invalid BASIC character.
• $(nn),y was not being assembled properly, whereas ($nn),y was.
• Casted offsets (offsets which are based on other offsets) were broken.
• Problems renumbering BASIC programs with ON..GOTO/GOSUB with spaces in the line number list.
• PC relative offsets (e.g. bvc *-2) fixed.
• ‘Align’ directive not working.
• Load/save in character editor.
• Multicolour issues with the screen/character/sprite editors.
• Including sprite files (IncBin) into assembly source only generated 63 bytes.

See the help for a complete list of new features and fixed bugs.

Download: CBM prg Studio v2.7.0 (896)

source: ajordison.co.uk

Some new games (Cracked / Trained or Unrealeased) for Commodore 64 have been released from your favorites groups: Alpha Flight, Nostalgia, Dév, The Mad Scientist, Dinasours, Didi, Unreal, The Hidden Farts and Laxity.

Download:

• Glider Rider +4/D/P/TL (959)
• Arcade Fruit Machine 101% +4DFH (1080)
• Immensity Preview (930)
• Jet Set Willy Bugfixed - TAPES (970)
• Jungle Jack +2 (926)
• Superbike +P (955)
• Titanic (979)
• Z-Zone +2 (919)
• Dina\'s Dinosaur Math (910)
• Electra-Ship +2 (940)
• Fetris 100% [pal/ntsc] [bugfixed] (921)
• Chopper Command + (953)
• Schlimeisch Mania (917)
• Schlimeisch Mania +F [pal/ntsc] (915)
• Guardian +2DH (913)
• Trance Sector CE +10HFD 100% [pal/ntsc] (939)
• All Games in One Archive (2417)

source: csdb.dk

Autopsy:

I have to thank my friend Damiano for sending me the ITS Module with a low serial number, which like the previous one (C64SD v2.0) i really appreciate it.

The ITS module is a interface that enables SD2IEC to play .TAP files version 1 and version 2 to a commodore machine. The ITS module was designed to fit into the pass-through tape connector of C64SD Infinity and to be connected to the C64SD by a four wires cable that allows C64SD to manage it.

SD2IEC firmware has been modified in order to add the commands and the routines needed to control the external ITS module without removing any of the original SD2IEC functionalities

Features:

• Play back any V1 or V2 standard .TAP files in order to load them into a commodore machine belonging to the “classic” or “264” series including: VIC-20, VC20, C64, C16, C116, C128 (all
• versions) and Plus/4. Note: some models of C128D doesn’t have the tape edge-card connector, of  course ITS is not compatible with these machines.
• Rebuild the original tape grabbed into all the .TAP version 1 and for most of the version 2
• Work permanently connected between the tape port of the commodore computers and the corresponding datassette (either 1530 white model flat plug or 1531 black model mini-din plug) acting
• As a pass-through transparent gateway or activated in order to play back .TAP files: no need to connect and disconnect the module to use your datassette.
• Play back .TAP content with optimal accuracy and completely in digital format without the hassle of file conversions or level adjustment
• Simulate tape motor activation logic fully so that the play back of the tape is managed as it would be in a real C2N tape. An override button has been provided able to stop the play back of the “virtual tape” at any time when necessary.
• Work with either 1530 (White model, flat plug) datassette recorder as well as with 1531 (Black, mini-din plug) datassette
• Load .TAP with multiple programs recorded one after the other (like the classic tape compilations sold in the 80′s)  

What Can’t You Do:

• Create a .TAP file representing the content of a Tape (i.e. ITS is not a “tape content grabber”)
• Fix the content of a TAP file in case it’s broken. Broken .TAP won’t load on your Commodore box. Since there are literally thousands of utilities to create and manipulate .TAP files there is the possibility to come across non-standard or incorrect .TAP files.
• Play back the content of .TAP of version V0. Use an utility to convert V0 .TAP files to V1 such as TapClean then you will be able to use the converted .TAP file with ITS module.
• Manage programs saved on tape that are based on the tape-counter management or on the time of wind-rewind of the tape.

The ITS Module can be purchased on the Manosoft site.

ITS Tape Loading video:

source: manosoft.it

This is the official demo party results from Silesia Party 7 (Top 3 Entries only). See also the Silesia Party homepage for more informations.

C64 Demo:

• 1. “Quadrangulus 80%” Dream
• 2. “B-Land Scrapbook” Samar

C64 4K Intro:

• 1. “One Flew Over The Cuckoo’s Nest” Samar
• 2. “Big Blue” Vulture

C64 Graphics:

• 1. “S7″ CRRN/Elysium
• 2. “Masks” Questor/Albion
• 3. “Waiting For Silesia” Joodas/Albion

C64 Music (1SID):

• 1. “Human Hunting” Randall/Arise
• 2. “In A Rush” MCH/Genesis Project
• 3. “Cow Anus Fucked” Surgeon/Vulture

C64 Music (2SID):

• 1. “Love Fileosophy” GRG/Shape
• 2. “Last Party” Buddha/Vulture
• 3. “Blank Page, Part 3″ Conrad/Samars.

C64 Sample Music:

• 1. “Sandmonster” MCH/Genesis Project
• 2. “Chemoglobina” Bab00n/Brownhole
• 3. “Kanikurwy” Raf/Vulture

Wild competition:

• 1. “Somar” Elytarium

Download: Silesia Party 7 full Party stuff (1007)

source: noname.c64.org/csdb silesiaparty.pl

This is a firmware hack of the version 2.6d build for the 1541 Ultimate Plus (MK1) by Bradon (forum link).

The latest official version for the 1541 Ultimate Plus (MK1) is the version v2.4a.

Note from the author:

After much frustration, I finally managed to get a working build environment for the 1541U firmware.

My 1541U is a MK1 Plus unit (no network). The last revision of the firmware I could compile is 2.6d, SVN revision 131. Starting with 132 it seems that the content is too much for the older FPGA. I started to look into removing cart ROMs I don’t use and gave up realizing this would be too much to do in my spare time, since their offset locations are hardcoded.

I removed the “too old” warning check so it will boot up without having to dismiss a warning.

So far it seems to work correctly. I don’t know if the FPGA revision check really matters for this revision or not. It would appear Gideon has no desire to continue supporting MK1 units since building for them is not possible with the latest revisions. This is of course fine with me (I don’t expect he will forever and ever try to make it work on older units), I just wanted the most recent build possible.

Changes:

• Added F3 help screen to show 1541U commands.
• Modified the file viewer so that scrolling will not advance past the last line.
• Added F1 and F7 page up/down to the file viewer.
• Modified behavior of the file browser so that when you cursor-right on an item with no children, the context menu is brought up as if you pressed return.

Download: 1541 Ultimate (MK1) v2.6d.o918r4 (1231)

source: 1541ultimate.net

I have decided to repair my two ColecoVision consoles bought like non-functioning many years ago. Below a description of the defects and of components being replaced.

Defect: black screen

• 1 x 2114 (VRAM)
• Joystick port # 1 broken (replaced with the joystick port of a Texas Instruments TI-99/4A)

Defect: black screen

• 1 x 2114 (VRAM)
• 3 x 4116 (RAM)

Some new games (Cracked / Trained or Unrealeased) for Commodore 64 have been released from your favorites groups: Onslaught, INFERIOR Software International, Antarctica and Laxity.

Download:

• Up in the Air Preview 2 +4 (890)
• Triangle +1D (931)
• Ball Preview (924)
• Flubble & Squij (+Remix) +8HD (964)
• Gold Quest 5 (956)
• All Games in One Archive (2346)

source: csdb.dk

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):

• 747 new SIDs
• 315 fixed/better rips
• 7 repeats/bad rips eliminated
• 629 SID credit fixes
• 750 SID model/clock infos
• 9 tunes from /DEMOS/UNKNOWN/ identified
• 5 tunes from /GAMES/ identified
• 27 tunes moved out of /DEMOS/ to their composers’ directories
• 15 tunes moved out of /GAMES/ to their composers’ directories

Download:

• HVSC Update #59 (1224)
• HVSC Complete #59 (1379)

source: www.hvsc.c64.org

We must always remember to remove the filter capacitor RIFA before turning on a computer off for over 30 years. Otherwise it might happen that you can see from the photos and the video.

This time is my fault because i had completely forgotten.

The Magic Smoke of a RIFA capacitor:

It’s been six long years of Design and Testing of the FPGA Arcade Replay Board and now finally is available for purchase.

Price is 199 Euro for the version without composite/SVHS output, 229 Euro with.

FPGA Arcade Replay features:

• Very large FPGA with high IO pin count for expansion.64 MByte of DDR memory.
• Six layer PCB for high performance and stability.
• 24 bit HD DAC with DVI / HDMI / VGA and legacy 15K monitor support.
• Video line buffer / filter for highest quality output.
• 24 bit / 192KHz audio DAC.
• Flexible clock generator.
• Small board size, fits in standard itx/atx case.
• Lots of expansion for custom daughterboards or IO adapters (JAMMA for arcade cab use).
• Optional dual host USB with dedicated CPU for low latency.
• Daughterboard with Ethernet, fast USB and optional 68060 processor being designed.
• Designed from the ground up to support multiple platforms (Amiga, Atari and others)

source: fpgaarcade.com

12►

I have received to repair five TI-99/4A with the following defects:

1. Black Screen
2. Working but with some dirt on the screen.
3. Vertical Stripes moving with a deafening sound.
4. Blue Screen with thin vertical stripes and deafening sound.
5. Blue Screen with thin vertical stripes and deafening sound.

The first two are repaired with the following faults:

Black Screen Fault: replaced TMS9929A followed by ROM CD2156NL
Dirt on the screen: replaced a 4116 RAM.

The third motherboard was used for spare parts.

The fourth and fifth motherboard with the blue screen have been the most annoying.

I spent 6 + hours to make measurements with an oscilloscope comparing one of the two motherboards with a working one to find the fault but the signals/voltages were absolutely identical.

So i have decided to go for exclusion and with a TI-99/4A Tech Data manual on my hand and 39.5 degrees in my Laboratory i have started to desolder and put a socket of the following components:

• 1 x TMS9901NL (20 +20 PIN)
• 1 x TMS9900NL (32 +32 PIN)
• 1 x TIM9904NL (10 +10 PIN)
• 1 x TMS 4732/2532 ROM U610 (12 +12 PIN)
• 1 x TMS 4732/2532 ROM U611 (12 +12 PIN)
• 1 x 74LS244 (10 +10 PIN)
• 1 x 74LS245 (10 +10 PIN)
• 1 x 74LS373 (10 +10 PIN)
• 1 x 74LS03 (7 +7 PIN)
• 1 x 74LS138 (8 +8 PIN)
• 1 x 74LS74 (7 +6 PIN)
• 1 x 4116 (8 +8 PIN)

After all this work nothing had changed, nothing worked, always BLUE screen.

I redid the measurements, but nothing, everything looked the same.

At this point there are only two static memories MCM6810P but that i don’t have investigated for what are used, because already on the motherboard are 8 x 4116 RAM Memory shared between Memory program and Video memory.

… anyway … i have tried to unsolder and put a socket.

So we add:

• 2 x MCM6810P (12 +12 PIN)

Et Voilà the two MCM6810P are both dead! both!

Obviously i don’t have this component in my laboratory, then i try to recover from the motherboard for spare these two RAM hoping that they are not faulty which however these RAM can be purchased online at a very low price.

The fifth and last motherboard that had the same defect of the previous one did not have the faulty ram MCM6810P.

To repair i had to replace the following components:

• 1 x 74LS04 (7 +7 PIN)
• 1 x TMS9900NL (32 +32 PIN)

Some new games (Cracked / Trained or Unrealeased) for Commodore 64 have been released from your favorites groups: Avatar, Nostalgia, Really Proud Lamers, Antarctica, Flimsoft, Genesis Project, Laxity, Hackersoft and Rewind.

Download:

• Phase Out Preview + (987)
• XOR +7DS [pal/ntsc] (964)
• Outbreak Preview (931)
• Lights On +6HD (899)
• Lights On (912)
• The Last Ninja +8D (900)
• TRAZ +7DH (894)
• Boxing Game Preview &D (910)
• I-Ball Revisited +35D (915)
• Tork Fighter-8 + (904)
• All Games in One Archive (2416)

source: csdb.dk

This is the official demo party results from Flashback 2013 (Top 3 Entries only). See also the CSDB Flashback 2013 section for more informations and download.

C64 Demo:

• Famous Australians Vol.1 by Fairlight, Offence, Prosonix

C64 Music:

• Back2_V_arsity by Viruz
• Night by NioByte
• Resurgence by Triton
  • Flashback zero-thirteen by Genesis Project

C64 Graphics:

• Party On, Fishbone by iLKke
• Knock by rexbeng
• Seafarer by Senex

Download: Flashback 2013 full Party stuff (994)

source: csdb.dk

Autopsy:

123►

I have repaired the PSU with the failure of stanby mode of the Sharp X68000 (gray version). The failure was caused by two electrolytic capacitors and the voltage regulator 7805 in short circuit.

I have also tried to repair the external case of the Sharp X68000 (gray version) that during the first transport in Italy many years ago was destroyed.

from Wikipedia:

The Sharp X68000, often referred to as the X68k, is a home computer released only in Japan by the Sharp Corporation. The first model was released in 1987, with a 10 MHz Motorola 68000 CPU (hence the name), 1 MB of RAM and no hard drive; the last model was released in 1993 with a 25 MHz Motorola 68030 CPU, 4 MB of RAM and optional 80 MB SCSI hard drive. RAM in these systems is expandable to 12 MB, though most games and applications did not require more than two.

The X68k ran an operating system developed for Sharp by Hudson Soft, called Human68k, which features commands very similar to those in MS-DOS (typed in English). Pre-2.0 versions of the OS had command line output only for common utilities like “format” and “switch”, while later versions included forms-based versions of these utilities, greatly improving their usability. At least three major versions of the OS were released, with several updates in between. Other operating systems available include NetBSD for X68030 and OS-9.

Early models had a GUI called “VS” (Visual Shell); later ones were packaged with SX-WINDOW. A third GUI called Ko-Windows existed; its interface is similar to Motif. These GUI shells could be booted from floppy disk or the system’s hard drive. Most games also booted and ran from floppy disk; some were hard disk installable and others require hard disk installation.

Since the system’s release, Human68k, console, and SX-Window C compiler suites and BIOS ROMs have been released as public domain and are freely available for download.

Early machines use the rare Shugart Associates System Interface (SASI) for the hard disk interface; later versions adopted the industry-standard small computer system interface (SCSI). Per the hardware’s capability, formatted SASI drives can be 10, 20 or 30 MB in size and can be logically partitioned as well. Floppy disks came in a couple of different formats, none of which are natively readable on other platforms, although software exists that can read and write these disks on a DOS or Windows 98 PC.

source: wikipedia