Commodore VIC-20 Repair.

Defect:

• Black Screen.

Replaced parts:

• Replaced MOS VIA 6522 (UAB1)
• Replaced BASIC ROMS 901486-01 (UE11)

Gallery of the repair:

Commodore 64C (ASSY 250469) Repair

Defect:

• Black Screen.

Replaced parts:

• 2 x NEC D41464D RAM (U10/U11)

Note:

• The two broken RAMs reached 70 degrees.

Gallery of the repair:

Atari 600XL Repair & Memory Upgrade

Defect:

• Keyboard unresponsive – Dead.
• Keyboard “A” Key Dead.

Repair:

• Replacing 2 x CD4051 (U22/U23)
• Sprayed R-11 Contact Cleaner inside the push button of the “A” key.

Enhancements:

• Upgraded the RAM memory from 16k to 64k (memory upgrade requires 3 short lengths of wire and two memory chips: HM50464P or equivalent 4464 to provide a full 64K).

Gallery:

This is a very simple composite video and audio mod for the Interton VC4000 console.

You need to remove the RF modulator (recommend to removing it completely) by removing all pins and then connect the video (V) Audio (A) and ground (G) signals like the photo and then use the same hole of the RF cable for the new video and audio cable.

Gallery:

Fixing RGB LED Solar Garden Light

Defect:

• Dead.

Replaced parts:

• YX8018 Solar Led Driver.

Gallery:

Olivetti Prodest 128S (Acorn BBC Master Compact) Modding

I found in the box of the rubbish dump two Olivetti Prodest 128S that was given to me long time ago by a dear friend: Andrea Pierdomenico.

Both computers are without the Floppy Drive and Power Supply external module.

I chose one of two in a better conditions and i did a modding to use it with a VGA Monitor and SDCARD instead of Floppy Disk plus some extras.

Work that has been done:

• Replaced the lame Olivetti ROMS (EPROM 27C512) with the original one from Acorn BBC Master Compact (release MOS 5510)
• GBS8200 v4.0 for VGA Output installed inside the case.
• Removed the Input Video signal connector (YPbPr) of the GBS8200 because they cause problems to closing the case.
• Capacitor FIX for GBS8200
• Installed a Power Switch.
• Cutted two pcb track for the Power Switch.
• Installed a VGA Connector.
• Replaced the Power LED (RED) with a GREEN LED.
• External power supply (5v / 2.5A).
• Installed a potentiometer (10K) to adjust the speaker volume.
• Cutted one pcb track for the potentiometer, otherwise the external volume adjust don’t work.
• TurboMMC installed (see the pinout for the internal installation).
• Installed TurboMMC Eprom.

TurboMMC pinout for the internal installation:

Gallery of work that was done:

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Download:

• Acorn BBC Master Compact ROM (929)
• TurboMMC ROM (880)
• TurboMMC 128MB MMC Image (Win32DiskImager format) (1008)

Commodore Amiga 500+ Replace Keyboard Membrane

Defect:

• 50% of the keyboard keys are totally dead.

Replaced parts:

• 1 x Keyboard Membrane.

Gallery of work that was done:

Conversion Amiga 500 REV 8A (512k Chip RAM) to 500+ (1MB CHIP Ram)

Some Amiga 500 sold at the end of 1991/beginning of 1992 have a motherboard of an Amiga 500+ but limited to the capabilities of a regular Amiga 500 with 512k of Chip RAM.

These motherboards can be converted to 500+ simply installing the missing pieces; RAM section and REALTIME CLOCK.

What i did is add a 512K to have 1MB of Chip RAM like the amiga 500+.

Gallery of work that was done:

Chinon FB-354 ReCAP (Amiga Floppy Drive)

Defect:

• Don’t read anything – Dead.

Replaced parts:

• 3 x Electrolytic Capacitors of 22uF.
• 1 x Electrolytic Capacitor of 1uF.

Gallery of work that was done:

Panasonic JU-253-043P ReCAP (Amiga Floppy Drive) #1

Defect:

• Don’t read anything – Dead.

Replaced parts:

• 1 x Electrolytic Capacitor of 10uF.

Gallery of work that was done:

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Panasonic JU-253-043P Replace Micro Switch (Amiga Floppy Drive) #2

Defect:

• The Floppy Disk is not recognized.

Replaced parts:

• 1 x Micro Switch.

Gallery of work that was done:

Teac FD-235F ReCAP (Amiga Floppy Drive)

Defect:

• Don’t read anything – Dead.

Replaced parts:

• 3 x Electrolytic Capacitors of 22uF.
• 1 x Electrolytic Capacitor of 4.7uF.

Gallery of work that was done:

Commodore 16 Repair

Defect:

• Black Screen / No Voltage.

Replaced parts:

• Replaced the Power Switch with a “new” original one.

Texas Instruments TI-99-/4A Empty PCB

This is what remained after the recovery. Some components (all TTL) are not been recovered, others were are already recovered some times ago for spare parts.

Gallery:

Hyperkin Supaboy S – RGB/Svideo HACK

I have decided to make this hack because the native video output of the Hyperkin Supaboy S is really bad, uses the composite video.

The photos with the LCD monitor use the SVIDEO output while the photos with the Sony CRT monitor use the RGB output.

The photos and the schematic describe very well the work that needs to be done, the hack is not complex but you always have to be makes particularly attention to the SMD (CXA 1645M) side welds.

RGB/Svideo Schematics:

Gallery of the work that was done:

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Philips Videopac+ G7400 RGB/Composite Hack – Repair – Recap

I have received a gift from my dear friend Andrea Pierdomenico a Videopac+ G7400 console with the BASIC Microsoft module and some cartridges that go into my collection of videopac cartridges.

This console running smoothly but with some problems.

• Power button not working (as usual)
• A capacitor of the power supply section has a broken leg.

The works that have been made:

• Replacing the power switch with a compatible one.
• Full recap of the power supply section.
• RGB/Composite HACK for unparalleled video output.
• RF Module Removal.
• Shifted the 220V Power Cable into the hole of the RF antenna.
• Two video cables (Composite-Audio / RGB-Audio)

Videopac+ G7400 RGB/Composite Hack (components that need to be added):

All the works that have been made are documented in the photos below:

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source: g7400 guide rgb mod