Replacing electrolytic capacitors Commodore Amiga 600/1200.

Gallery full Recap 2 x Commodore Amiga 1200:

Gallery full Recap 1 x Commodore Amiga 600:

All computers that i use for experiments or tests must at least be cleaned and disinfected.

Works that have been made:

• General and accurate cleaning.
• Accurate cleaning with a magnifying lens of the AMIGA logo with isopropyl alcohol. I have used also a toothpick to remove the black color from the corners.
• Full Recap of the motherboards.
• Removed the two pieces of metal.
• Fixed the RGB video connector (totally broken).
• Replaced the keyboard with another one less yellowed.
• Added a Gotek Floppy Drive with HXC Firmware.
• Kickstart ROM 3.1.

Photo gallery before cleaning:

Photo gallery after cleaning:

Repair Motherboard (ASSY 326298) Drean Commodore 64

Defect:

• Black Screen.
• Missing Video Signal.

Cause of the Missing Video Signal:

• The motherboard of this C64 to work with the PAL-N video (Argentina) has been modified. Some pcb tracks are cut off and the modulator has been replaced. There are also a few bridges to retrieve the S-VIDEO output (luma / chroma).

Video Restoration:

• I have made a bridge with a wire for recover the composite signal that has been removed (tiny blue wire).

Repair:

• The cause of the black screen are 2 x MK 4564 ram in short circuit.

Photo gallery of repair:

The Commodore 2031 and Commodore 4031 are single-unit 5¼” floppy disk drives for Commodore International computers. They use a similar steel case form to the Commodore 9060/9090 hard disk drives, and use the IEEE-488 interface common to Commodore PET/CBM computers. Essentially, both models are a single-drive version of the Commodore 4040.

The Commodore 2031LP is functionally the same as the 2031, but used the lower-profile tan case of the second version of the Commodore 1541 floppy disk drive intended for home computer use.

These drive models use a single-density, single-side floppy data storage format similar to that used by the Commodore 1540 & Commodore 1541 drives, but with a slightly different data marker indicating which model originally formatted the disk. The low-level disk format is similar enough to allow reading between models, but different enough that one series of drive models cannot reliably write to disks formatted with one of the other model series. A different of one extra ‘header’ byte is what causes this write incompatibility.

Gallery:

Repair/Restoration Commodore Floppy Drive 2031LP

Defect:

• Lock lever of the Floppy Drive broken.
• When the Floppy Drive is powered up, red LED stays on and spindle motor runs continuously.

Repair/Restoration:

• Replaced the Lock lever with a new one taken from a Commodore Floppy Drive 1541 (spare parts)
• Replaced the ROM (UAB5 901484-05) with a EPROM MCM 68766 supplied from my friend Giacomo Vernoni.

Note:

The Eprom programming was done with a EPROM programmer Promenade by Jason-Ranheim Co. for Commodore 64.

Repair/Restoration Gallery:

Download: Commodore Floppy Drive 2031LP/HP Rom (1314)

source: wikipedia

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

Titles:

• The Wasps and the Apples +T
• Petscii-Poker
• Petscii Poker &D
• Time of Silence V1.0
• Midnight Resistance +8DFHR
• Chest Bump 101% +MF
• Sprint 1 +2H
• Motorman Preview +M
• Lorella +3ME
• Vendetta [easyflash]
• Quadrant 4 +2
• Quadrofender +5  
• Athanor Preview
• The Evil Dead +3DGMH
• Storm Warrior +3D
• Scorched Earth Preview
• Wizard Saga Preview 2 +2
• The Last Breakout +
• Quadrofender +5F
• Gameboy Tetris V2 Preview +J
• Dragon’s Cave +19D
• Quadrant 4 +2F
• U91306 – Eidothea – The Daughter of Protheus [seuck]
• Zamzara Preview Pack +6
• Quod Init Exit v1.5
• The Soul Gem of Martek Preview +D
• Sunburst +14D
• Gulp!! And Arrow Graphics &D
• Jump Ninja Preview +
• Mining +2D

Download: All Games in One Archive (4229)

source: csdb.dk

Sorry, this entry is only available in Italian.

The Home Computer Asem AM 100 is a clone of the Apple II+ (Apple // Plus). This computer was manufactured and assembled by ASEM S.p.A. Artegna (UD) / Italy.

The AM 100 is fully compatible with all the software available for the Apple II and II+. I have personally tested many programs and i’ve never found problems of compatibility.

Unfortunately this computer is arrived faulty, the repair was more simple than i expected, thanks to the IC sockets located on the computer motherboard.

Works that have been made:

• Replacing IC 74LS161 which shows a vertical band on the screen.
• Removing RIFA filter capacitor located inside the PSU.
• Regeneration of the Keyboard PAD. Some keys did not work properly. The Keyboard PAD have been regenerated using a suitable product that can be found for sale on eBay. Try: KEYPAD FIX
• General cleaning of the case outside/inside, monitor and keyboard.
• EPROM dump.

All these works are documented with photos that you can find below.

Gallery repairs:

12►

Under the cover gallery:

12►

Final photos:

Interesting discovery:

Inside the Floppy Drive reader (Apple clone) i have found the same mechanics (Mistumi / Newtronics) of the Commodore Floppy Drive 1541. See the first three pictures of the gallery: Under the cover.

Download: ASEM AM 100 full Eprom Dump (1335)

Tynemouth Software PET microSD & PET ROM-RAM-Tester replacement boards

PET ROM-RAM-Tester:

This is a board which plugs into the 6502 CPU socket on something like a Commodore PET and can selectively replace the onboard ROM (it includes a test software) or RAM.

PET microSD:

Disk drive replacement for Commodore Pet range of computers, the 2001, 3000, 4000 and 8000 series. It also works with vic-20/c16/Plus4/c64/128*

*IEEE-488 adapter required.

You can buy these boards from here.

Packaging:

source: tynemouthsoftware.co.uk

UK1541 is a real time drive emulator with cycle-exact 6502 instructions execution and VIA’s emulation just by tiny MCU, LCP1114, Cortex M0, 48Mhz (0,84 DMIPS/Mhz).

Developed by Krzysztof Switajski aka Kisiel/ICON.

Features:

• LCD TFT Screen 2,2“ , 320 x 240, True Color.
• MSP430.
• LPC1114.
• Infra Red receiver, for remote control.
• CR2032 battery holder.
• Mini jack connector as replacement for IEC port.
• DB9 connector for joystick.
• User Port connector, for power and signals like 8-bit parallel aka burst.
• Two buttons , MENU and RESET.

Features for the latest Core Version (1.1.4.012015):

• Core 6502 running at 1Mhz with illegal opcodes – 16kB Flash ROM, multiple custom roms not available now
• 4KB Ram, from $0000 till $0fff
• VIA port and timers emulation
• SD card 1 – 8GB, FAT32, formatted in Windows.
• d64 35 / 40 track with read and write (beta testing)
• Update from standard SD card.

Gallery:

source: wiki.projekt64.filety.pl

Forth, the Language.

Forth is a different language. It’s aged and a little weird.
What’s cool about it? It’s a very low-level and minimal language without any automatic memory management. At the same time, it easily scales to become a very high-level and domain-specific language, much like Lisp. Compared to C64 Basic, Forth is more attractive in almost every way.

It is a lot more fast, memory effective and powerful. Compared to C, specifically cc65, the story is a little different. It’s hard to make a fair comparison. Theoretically Forth code can be very memory efficient, and it’s possible to make Forth code that is leaner than C code. But it is also true that cc65 code is generally much faster than Forth code.

Download: durexForth v1.4.3 + Manual (1074)

source: csdb.dk

Commodore VIC-20: latest games from VIC-20 Denial forum.

Download: All Games in One Archive (1652)

source: VIC-20 Denial Forum

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 v3.3.5 (Windows/OSx/Linux) (1232)

source: popelganda.de

This is what we read on the homepage of the 1541 Ultimate-II:

source: 1541ultimate.net

Available on stock the new version of the V3 C64SD Princess by Manosoft. For more information please visit the Manosoft website.

source: manosoft.it

Jean-François DEL NERO (who’s behind the HxC SD Floppy Emulator) recently has released a version of the HxC emulator firmware that is compatible with the STM32 chip used in the Gotek floppy emulators.

This means that the great functionality of the HxC SD emulator is now available on cheaper and more widely available hardware.

The bootloader to convert the Gotek floppy drive in HxC compatible must be purchased on the website HXC 2001 by sending an email to Jean-François DEL NERO. The price of the bootloader is one-off 10 Euro per Gotek that you want to update. Future updates of the software are free and can be made from a USB stick

The HXC Usb (Gotek) firmware supports:

Flashing the Gotek floppy emulator with HxC firmware:

source: hxc2001.com