Commodore 64 ASSY 251137 Empty PCB

May 3rd, 2014 2 comments
Commodore 64 ASSY 251137 Empty PCB

Gallery:

Commodore 64 ASSY 251137 Empty PCB + some Working components.

Apple Monitor IIgs (A2M6014Z) Focus problem workaround.

April 26th, 2014 No comments

Apple Monitor IIgs (A2M6014Z) Focus problem walkaround. Apple Monitor IIgs (A2M6014Z) Focus problem walkaround.

The horizontal measuring was made calculating the ledge at the base of the monitor.

Unfortunately, this monitor suffers from a serious problem of image quality.

The monitor become very hot and the adjustment resistance (trimmer) of the Focus controls that is inside the flyback loses its original value.

After nearly an hour of operation, the image becomes blurred and we must adjust the trimmer of the focus located inside the monitor, that’s why i have made this modification to the external case of the monitor.

The flyback is NOT longer exists as a spare parts.

Datanetics Apple Keyboard Fix.

April 26th, 2014 No comments

Datanetics Apple Keyboard Fix Datanetics Apple Keyboard Fix

Datanetics Apple Keyboard Fix.

After a few cold solder joints redone the keyboard works almost perfectly.

Todo:

  • The “V” key is totally dead.
  • The keys are a bit tired, don’t return always in the original position.

Overall is fine.

Datanetics Apple Keyboard *update*

I found a temporary solution for the tired keys they don’t return always in the original position. I have put a small spring (see the picture). Now the keys works correctly.

About the “V” key completely dead, i have desoldered it and i have tried to spray a air into the slots without having any results, so i have tried a extreme thing, i have used the key switch like a whistle. ;-D I have blown inside several times, the result is the key switch now are working again. I have made the same thing for the “right arrow”.

Apple II Europlus / Keyboard and Floppy Disk Drive Repair

April 25th, 2014 1 comment

Apple II Europlus / Keyboard and Floppy Disk Drive Repair Apple II Europlus / Keyboard and Floppy Disk Drive Repair

Apple II Europlus / Keyboard and Floppy Disk Drive Repair Apple II Europlus / Keyboard and Floppy Disk Drive Repair

Apple II Europlus / Keyboard and Floppy Disk Drive Repair

Defects:

  • The peripheral slots are totally dead.
  • Don’t runs programs that take up more than 16k
  • The keyboard doesn’t respond properly.
  • The Floppy Disk Drive don’t read anything.

Replaced parts:

  • Replaced [H12] Decoder/Demultiplexer 74LS138 in the position [H12]
  • Replaced 3 x 4116 RAM in the row [D]

Keyboard:

  • Cleaned the blades and the contacts on the pcb. Work not recommended to those who have little skill.

Apple Floppy Disk Drive:   

  • The Floppy Disk Drive (Drive 2) had to be cleaned and oiled.

Macintosh Plus (Sad Face) Repair

April 25th, 2014 1 comment

Macintosh Plus Repair Macintosh Plus Repair

Macintosh Plus repair.

Defect:

  • Mac sad face with error code not readable.

Replaced parts:

  • 2 x ROM (342-0341-B / 342-0342-A) replaced with two EPROM 27C512 (pinout compatible)

Note:

All roms that i have found on the net or sent by friends are not working.
I had to do a dump of the Rom of my Macintosh Plus and at this point everything has worked immediately.

Download: Macintosh Plus ROM (27C512 Splitted) (362)

Apple IIe STK Asic Clone (Orange) Repair

April 25th, 2014 No comments

Apple IIe STK Asic Clone (Maybe Orange) repair.

Defect:

  • Short-circuit on all voltages.
  • Black/Garbage screen.

Replaced parts:

  • 10 x Tantalum Capacitor 4.7uf (replaced with Electrolytic Capacitors)
  • 3 x RAM OKI M3764A-15 in Short-circuit.
  • 1 x ROM 1 (EPROM 27128)

Note:

I have to thank immensely my friend Alessandro Polito for providing me the dump of the ROM 1 of the Orange (Apple IIe Asic Clone)

Download: Orange Apple IIe Clone Roms (380)

Hot Line SCSI Box

April 25th, 2014 No comments
Hot Line SCSI Box

I thank my dear friend that gave me the Hot Line SCSI Box.

Autopsy:

Box for SCSI hard disk.

Description:

  • One Slot 3.5″ 50 Pin SCSI hard disk.
  • Internal Power supply.
  • Lights indicator for power, HDD activity.
  • Internal scsi connection cable included.
  • External Connections 2 x SCSI 50-pin Centronics female.
  • Switch for SCSI ID.

Commodore 64 ASSY 250425 Empty PCB

April 24th, 2014 1 comment
Commodore 64 ASSY 250425 Empty PCB

Gallery:

Commodore 64 ASSY 250425 Empty PCB + some Working components.

Example of replacing exhausted Electrolytic Capacitors

April 22nd, 2014 No comments
Example of Replacing Electrolytic Capacitors

Gallery:

Example of replacing exhausted Electrolytic Capacitors.

My advice is always to replace all capacitors although at first view does not seem exhausted with acid leakage.

Revision 2014: C64 – Official demo party results

April 21st, 2014 No comments

This is the official demo party results (C64 Only) from Revision 2014. See also the official homepage for more informations.

C64 4K Intro:

  • 3 – Back in the Saddle by Razor 1911.

C64 Game:

  • 2 – Immensity – Revision 2014 Edition by Dév.

WiLD Demo:

  • 1 – 10 Orbyte by Tristar & Red Sector Incorporated.

Mixed Graphics:

  • 4 – Lost in the Forest of Owls by Chorus, Resource, Singular.
  • 5 – Party Train Incoming – Mind the GAP by Tristar & Red Sector Incorporated.
  • 6 – Social Net by Arsenic, Oxyron.
  • 8 – Devil or Angel? by Resource.

Mixed Music:

  • 2 – Dekadance by Darklite.
  • 4 – Spiral Silicon Towers by Panda Design.
  • 5 – Specular Highlight by Lft.
  • 9 – Fuzzy Brawl by Edge of Panic.

Mixed Demo:

  • 3 – Redefinition by Fairlight, Offence.
  • 6 – Panopticon by Brainstorm, Traction.

Download: Revision 2014 Party stuff (506)

source: noname.c64.org 2014.revision-party.net

Memory Expansion Spem EXP-MEM 512k for Sinclair QL

April 18th, 2014 7 comments
Spem EXP-MEM 512k for Sinclair QL

I thank my dear friend that gave me the Spem EXP-MEM 512k.

Autopsy:

Various companies offered to upgrade your QL with an internal memory upgrade. This was normally 512K, but some companies also offered a 256K version.

The method of upgrade was in two ways:

  • Removal of the existing QL memory chips and replacement to give a total of 512K
  • An internal board, which connects to the 8301 ULA socket, and has a wire to the 68008 processor.

The downside of this method of upgrading the QL’s memory was:

  • The memory access was slower than external memory
  • You could not use some of the later QL expansions, such as the Trump Card which themselves had memory built into the interface.

Internal interfaces were advertised by a range of companies, including CST, MicroPeripherals and Silicon Express.

source: Sinclair QL Computer Wiki

durexForth v1.3 (Forth language for Commodore 64)

April 17th, 2014 No comments

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 v1.3 + Manual (290)

source: noname.c64.org

Javatari v4.1 (Atari 2600 emulator)

April 12th, 2014 No comments

Javatari is a multiplayer Atari 2600 emulator written in pure Java with no external libs.

Features:

  • Client-Server multiplayer mode. Runs great in low-latency networks such as LANs.
  • Drag&Drop and Copy&Paste of ROM files or URLs. Very easy to try ROMs from websites!
  • Scanlines and TV screen emulation modes.
  • Real Atari console user interface.

Changelog:

  • New concept: Savestate Cartridges!
  • Store emulator state as Savestate Cartridge files to disk any time (press F8)
  • Savestate Cartridges can be distributed and loaded as normal ROMs.
  • Savestate Cartridges can also be embedded as auto-load ROMs.
  • Support for Starpath/Supercharger Tape ROM format.
  • Bugfixes and improvements.

Download: Javatari JAR v4.1 (Needs Java 6 or greater) (279)

source: javatari.org

Staff K8AP Multi-Compatible Keyboard (Apple II/IIe)

April 6th, 2014 1 comment
Staff K8AP Multi-Compatible Keyboard (Apple IIe)

I thank my dear friend that gave me the Staff K8AP Multi-Compatible Keyboard. Unfortunately is missing the adapter card to install inside the computer.

Autopsy:

Compatible keyboard for the Apple II / IIe.

The Atari CX-77 Touch Tablet (Boxed)

April 6th, 2014 1 comment
The Atari Touch Tablet (close-up)

I thank my dear friend that gave me the Atari Touch Tablet.

Autopsy:

The Atari Touch Tablet was a well designed and brilliant idea. Giving the user the ability to use a virtual sheet of paper and pen, they could draw, drag and drop, paint and erase images with the included Atari Artist program.

Perhaps given more time, the Touch Tablet could have been used for many other innovative ideas and perhaps vertical market applications. The Atari CX-77 Touch Tablet was designed by Tom Palecki formerly of Atari’s Industrial Design group.

source: atarimuseum.com