I have repaired an Atari 800XL for a friend. The failure was caused by a faulty cpu, the computer freezes after 10 minutes of operation, using an oscilloscope i have noticed that the clock pin of the cpu did not give me more signal but when i have used the synthetic ice spray on the cpu has resumed to work.

This type of cpu (Atari customized 6502 – C014806-12 Sally) is not easy to find but fortunately a friend of mine (Carlo) has found a spare part for me.

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Thanks to Paolo Cognetti for giving me this device in good conditions.

Plug ‘n Power Programmable Appliance/Light Controller it’s an old device for the TRS-80 Color Computer for home automation.

Object consists of Plug ‘n Power, Appliance and Light Controller, two cords, a manual, and battery test card.

Download: Plug & Power Appliance and Light Controller (PDF) (2654)

Details:

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Jump here for the commercial RGB mod for the Mattel Intellivision

I have found this RGB mod for the Mattel Intellivision console fom a site, i have searched on the net if anyone has tried this mod, but nothing, so, i have tried to do it myself.

This mod is not easy to do, especially if one has no experience in electronics, however the result at the end is spectacular.

Schematics (click to zoom):

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from Elektronite Homepage:

One smart ape has escaped from his cage. Mario, the zookeeper, is in a real fix! The gorilla Darwin has captured a very special lady and made his way onto a construction site and up bewildering, unfinished structures and a veritable King Kong! Leap for your life over bouncing barrels, ride fast-moving platforms to dizzying heights, scurry under runaway springs, and avoid roaming flames and dangerous balls of gas as you make your way up. It will take not only Mario but one of his brothers Toni and Bruno to outsmart the big ape and return the girl to safety.

It’s TWO games in one! The first arcade game, PLUS a second game with five all NEW levels inspired by the arcade hit D2K: Jumpman Returns! 9 Screens in total!

Features:

• New graphics and sound effects. Hear DK growl for the first time!
• Separate high scores for Game 1 and Game 2. Perfect for high-scoring competitions!

Video D2K ARCADE review for IntelliVision:

source: elektronite.com

Material donated:

• Commodore Monitor 1085S (The 1085(S) is a cost-reduced version of the 1084, with lower resolution (.52 mm dot pitch) and no non-glare screen treatment.)
• Commodore Amiga 500 + 512k Expansion.

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from Denial Wiki Homepage:

The VIC-1020 (known as the VC-1020 in Germany) expansion chassis is a large metal enclosure which provides the VIC-20 computer with six additional expansion slots for cartridges (five pointing upward and one lying horizontally and pointing toward an opening on the the back of the VIC-1020). The entire VIC-20 computer is placed into the VIC-1020 and a male edge connector on the 1020′s slot expansion board is mated with the VIC-20′s internal cartridge port. A monitor can be placed on top of the VIC-1020, giving the entire setup a PET computer-like appearance. Indeed, the black “CBM” label across the front of the VIC-1020′s casing is similar to that used on the the PET line of computers. The choice of sheet metal for this enclosure seems natural, as Commodore had a sheet metal fabrication plant for the production of office filing cabinets and desks.

The VIC-1020′s chassis has additional storage space which can be used for the computer’s power supply (a pass-through for the power supply is provided). There is also a metal clip on the underside of the lid which can hold the RF modulator.

Slot expanders such as this allowed the simultaneous use of several cartridges on a single VIC-20. This allowed features of utility cartridges (like the Programmer’s Aid cartridge) and RAM expanders to be combined. Unlike some other slot expanders, however, the VIC-1020 lacked switches to enable or disable individual cartridges – meaning cartridges had to be physically removed to disable them. This emphasizes what seems an apparent design flaw of the VIC-1020; the monitor needs to be lifted off the chassis and set aside to enable the user to open the lid and access the extra cartridge ports – a cumbersome process if repeated often.

source: sleepingelephant.com

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You can found Parts list and Schematics here

from wiki.intellivision.us Homepage:

The Intellivision directly generates composite video using the AY-3-8915 Color Processor and a set of resistors. This video gets fed to the ASTEC UM1285-8 video modulator for conversion to RF for display on a television set. It is possible to tap this composite video directly to avoid the distortion and static associated with RF modulation and demodulation. On older units, the RF modulator can decay rather noticeably, leading to very low quality video.

Typical composite video inputs have an input impedance of 75Ω. In contrast, the composite signal generated by the Intellivision has a very high output impedance. (We estimate the output impedance is around 2KΩ.) Tapping this output and feeding it directly into a typical composite monitor does not work. (It will work if your monitor has a “high impedance” input, but such monitors are atypical.) Thus, an amplifier/impedance matching circuit is necessary.

It is also possible to tap the audio the Intellivision generates. The audio output by the Intellivision is nearly directly suitable for feeding line-level inputs on most AV equipment. All that’s required is a coupling capacitor.

The modification should work equally well on all Intellivision variants, including the Intellivision 1, Intellivision 2, the various rebranded units (Sears, Tandy), and the later INTV releases.

source: wiki.intellivision.us

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Kernel JiffyDos Installation and Keyboard Repair for my friend Damiano (manosoft.it). To repair the keyboard you must clean the contacts very well on the pcb.

Working Commodore SX-64 in cluster ;-D

Today a friend has donated to me some nice things. Thanks Damiano (Manosoft).

Things that have been donated:

• Commodore SX64 Manual.
• TV +4 Pong Clone.
• PCB Multi Kernel C64/C64C Switch.
• PCB Universal PLA Adapter.
• Atmel 27C512 PROM 70ns.
• Some DIMM Memory (256mb and 512mb)
• Mattel Intellivision.
• Mattel Intellivision Boxed Games:
  • Football.
  • Advanced Dungeons & Dragons.
  • Skiing.
  • Maze-A-Tron.
  • Sea Battle.
  • Tennis.
  • Basketball.

Loading game Armoured Assault and Spectron on Spectravideo SV-318.

Video:

Download:

• Spectravideo SVI 318-328 - CAS (TOSEC-v0.01) (1481)
• CAS to WAV Converter v1.0b (1341)
• Service Technical Manual SVI-3x8 (2391)
• SVI-328 Basic Reference Manual (4893)

source: spectravideo software tools

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This configuration includes:

• Spectravideo SV-904 Data Cassette (Boxed)
• Spectravideo SV-602 Mini Expander (Boxed)
• Spectravideo SV-803 16k RAM Cartridge (Boxed)

from Wikipedia:

Spectravideo, or SVI, was a U.S. computer company founded in 1981 as “SpectraVision” by Harry Fox. They originally made video games for Atari 2600 and VIC-20. Some of their computers were MSX-compliant or IBM PC compatible. They ceased operations in 1988.

SpectraVision was founded in 1981 by Harry Fox and Oscar Jutzeler as a distributor of computer games, contracting external developers to write the software. Their main products were gaming cartridges for the Atari 2600 VCS, Colecovision and Commodore VIC-20. They also made the world’s first ergonomic joystick, the Quickshot. In late 1982 the company was renamed to Spectravideo due to a naming conflict with OnCommand’s Hotel TV system called SpectraVision.

In the early 1980s, the company developed 11 games for the Atari 2600, including several titles of some rarity: Chase the Chuckwagon, Mangia and Bumper Bash. A few of their titles were only available through the Columbia House music club.

The company’s first attempt at a computer was an add-on for the Atari 2600 called the Spectravideo CompuMate, with a membrane keyboard and very simple programmability.

Their first real computers were the SV-318 and SV-328, released in 1983. Both were powered by a Z80 A at 3.6 MHz, but differed in the amount of RAM (SV-318 had 32KB and SV-328 had 80KB total, of which 16KB was reserved for video) and keyboard style. The main operating system, residing in ROM, was a version of Microsoft Extended Basic, but if the computer was equipped with a floppy drive, the user had the option to boot with CP/M instead. These two computers were precedent to MSX and not fully compatible with the standard, though the changes made to their design to create MSX were minor. The system had a wide range of optional hardware, for example an adapter making it possible to run ColecoVision games on the SVI.

A later version, the Spectravideo SVI-728 was made MSX compatible. SVI-738, also MSX compatible, came with a built-in 360 KB 3.5″ floppy drive. The last computer produced by Spectravideo was the SVI-838 (also known as Spectravideo X’Press 16). It was a PC and MSX2 in the same device.

Today the Spectravideo name is used by a UK based company called SpectraVideo Plc, formerly known as Ash & Newman. That company was founded in 1977, and bought the Spectravideo brand name from Bondwell (SVI owner) in 1988. They sell their own range of Logic3 branded products, and do not have any connection to the old Spectravideo products.

source: wikipedia

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from Roger Spectravideo homepage:

The SV-803 16K RAM Pack allows you to easily and economically add 16K worth of “Random Access Memory” to your SV computer.  You can bank switch to a second bank of memory from BASIC.

Download: SVI 803-807 Users Manual (1210)

source: roger spectravideo homepage

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from Roger Spectravideo homepage:

SV-602 Single Slot Expander it houses one interface cartridge, and provides a very economical means of interfacing your SV computer with a single peripheral at a time.

source: roger spectravideo homepage

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from Roger Spectravideo homepage:

SV-904 Data Cassette it connect easily to the SV-318 or SV-328, our data cassette provides an inexpensive means of running and storing a wide range of computer programs.

source: roger spectravideo homepage