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Philips VG-8235 (MSX2) Upgrading & Restoration

July 29th, 2018 No comments
Philips VG-8235 (MSX2) Upgrading & Fixing

This poor computer was given to me in year 2015 but unfortunately it arrived at destination destroyed.

In these days i have decided to fix it and make some upgrades to make it more usable.

Upgrading & Restoration:

  • General cleaning of external case and motherboards.
  • Fixed the ventilation grid as the best i could do.
  • Glued the pins where the screws lock the keyboard.
  • Cleaning and Belt replacement of the 360k Floppy Drive.
  • Replaced MASKROM MSX VG-8235 (U7) with an EPROM 27C512 with the firmware of the MSX VG-8245 to use 720k floppy disk on the internal drive.
  • Replaced the original Floppy Drive with the GOTEK (HXC).
  • Removed the battery for the system clock.
  • Bypassed the impedance L1 on the power supply stage (solves video noise if the original Floppy Drive is not used)
  • Rerouted Floppy Drive cable to make it compatible with a standard Floppy Drives.
  • Fix for the missing signals of the Internal Floppy Drive but present on the external Floppy Drive (you need to solder 2 wires)

Gallery of the work done:

Download: MSX 8245 50hz Rom [27512] (135)

Updating ROM of the MSX FDD Interface to support DD (720KB)

July 25th, 2018 No comments
Updating ROM of the MSX FDD Interface to support DD (720KB)

Playing with the MSX and HXC with DSK support, meanwhile updating the ROM of the FDD Interface to support double sided disk (720KB).

Gallery:

Download: MSX FDD Interface ROM (360k/720k) (117)

Sony HITBit HB-75P (Keyboard repair)

July 15th, 2018 No comments
Sony HITBit HB-75P (Keyboard repair)

Sony HITBit HB-75P (Keyboard repair).

Defect:

  • Some keyboard key doesn’t work (3, MINUS, Q, SPACE, CODE [DX]).

Fix:

  • Cleaning the PAD inside the Key Switch.
  • Redone the soldering of the pcb pad (space switch) that was broken at the base.

Gallery:

Sony HB-F1XD (MSX2) Audio Repair

July 15th, 2018 No comments
Sony HB-F1XD (MSX2) Repair

Sony HB-F1XD (MSX2) Repair.

Defect:

  • Missing Sounds.

Replaced parts:

  • 3 x SMD Capacitors. (2 x 10uF – 1 x 100uF) on the Audio/Video Encoder PCB.

Gallery of the repair:

Download: Sony HB-F1XD (MSX2) Technical manual (113)

2 x Atari 800 XL Repair

July 15th, 2018 No comments
Atari 800 XL Repair #1

Atari 800 XL Repair (1 of 2)

Defect:

  • Cartridges don’t work.
  • Some games or demos via SIO don’t work.

Replaced parts:

  • Replaced ROM CO61598B (U5) with a EPROM 27C128.

Gallery of the repair:

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Atari 800 XL Repair #2

Atari 800 XL Repair (2 of 2)

Defect:

  • The computer starts only in SELF TEST mode.

Replaced parts:

  • Replaced ROM BASIC C060302A (U4) with a EPROM 27C64 through adapter from 2364 to 2764.

Gallery of the repair:

Download:

Commodore Amiga 1200 Full Recap

July 15th, 2018 No comments
Commodore Amiga 1200 Full Recap

Commodore Amiga 1200 Sostiuzione Condensatori.

Gallery:

Hantarex PCB Coin-OP Monitor Full Recap

July 15th, 2018 No comments
Hantarex PCB Coin-OP Monitor Full Recap

Hantarex PCB Coin-OP Monitor Full Recap.

Not very funny but someone has to do it. 8-)

Retro Things to be repaired for some friends

July 6th, 2018 No comments
Retro Things to be repaired

Retro Things to be repaired for some friends.

  • 1 x Amiga 1200 (Full Recap)
  • 1 x Atari 800 XL (don’t runs anything)
  • 1 x Atari 1010 (check)
  • 1 x Commodore 1571 (freezed/error)
  • 1 x Hantarex PCB Coin-op Monitor (Full Recap)
  • 1 x Sony HITBit HB-F1XD MSX2 (missing sound)
  • 1 x Sony HITBit HB-75P (keyboard problem)

Vampire A600 V2 – Video Flickering with Black Screen Fix

May 29th, 2018 No comments
Vampire A600 V2 - Video Flickering with Black Screen Fix

Vampire A600 V2 – Video Flickering with Black Screen Fix

According to Gunnar on the Apollo Forum a way to fix the video flickering with black screen that afflicts some installations is soldering two capacitors of 22uf 16v on top of C3 and C6 of the Vampire A600 V2.

Seems to work properly for now.

Gallery:

 

Commodore Amiga 1200 Full Recap & Cleaning Floppy Drive

May 12th, 2018 No comments
Commodore Amiga 1200 Full Recap & Cleaning Floppy Drive

Commodore Amiga 1200 Full Recap & Cleaning Floppy Drive.

Gallery:

Restoration and Repair Commodore Floppy Drive VC-1541

May 5th, 2018 2 comments
Commodore Floppy Drive VC-1541 (differences before and after)

I start immediately to say; Floppy Drive, Metal base with the Transformer are ended up in the trash, are unrecoverable (see photo).

What i did is carefully clean the external case of the Floppy Drive which i am quite satisfied of the result.

Then i have started to repair and carefully clean the motherboard of the Floppy Drive (REV 1540050) that had the following problems (see photo):

  • I had to use the sockets for all the integrated circuits, because the rust had crept under all the integrated circuits, creating many problems.
  • Remove the voltage regulators and clean the rust that was under the heatsink.
  • Clean and try all integrated circuits after removing them.
  • Clean the PCB.
  • Replaced 2 x 6522 (VIA) that is not working.
  • Replaced 1 x 6502 (CPU) that is not working.
  • Replaced 1 x HM6116P (STATIC RAM) that is not working.
  • Replaced 2 x Resistors of 9.1k 1% interrupted.
  • Replaced for safety also 1 x Resistor of 91ohm 1%.
  • Moved the ceramic capacitor (FIX by Commodore) to the solder side, which was fixed above the 74LS86.
Restoration and Repair Commodore Floppy Drive VC-1541

What i have used to clean the external Floppy Drive case:

  • I have used a plenty of running water by rubbing with a brush to remove everything you could do without using specific products.
  • I have used CIF GEL with bleach that i left to act for 30 minutes.
  • I have rinse thoroughly with water, always rubbing with the brush and with a stanley plastic spatulas
  • I repeated these last two phase for least 3 times.
  • I have used CIF Degreaser with Bicarbonate that i left to act for 10 minutes.
  • With a Brush / Toothbrush / Toothpicks / Cotton Fioc / Stanley plastic spatulas o have rubbed and cleaned the most dirty and hidden parts.
  • I have rinse thoroughly with water, always rubbing with a brush.
  • I repeated these last three phases for least 4 times.
  • I have completed the cleaning with the Glassex and Alcohol.

I have used a Floppy Drive mechanics and a transformer that i have found in the laboratory that i have installed in the Floppy Drive VC-1541 case.

Restoration and Repair Gallery:

Differences before and after the restoration Gallery:

Commodore VIC-20 (ASSY 250403) Repair

Commodore VIC-20 (ASSY 250403) Repair

Commodore VIC-20 (ASSY 250403) Repair

Defect:

  • Black Screen.

Replaced parts:

  • Replaced MOS 65245 [74LS245] (UF8)

Gallery of the work done:

Commodore 128 (REV 310381) Repair

May 3rd, 2018 1 comment
Commodore 128 (REV 310381) Repair

Commodore 128 (REV 310381) Repair

Defect:

  • Black Screen.

Replaced parts:

  • Replaced 74LS08 (U61)
  • Replaced CPU 8502R0 (U6)
  • Replaced PLA 8721R3 (U11)

Gallery of the work done:

Pioneer LaserActive CLD-A100 – Repair & Modules full Recap

April 23rd, 2018 2 comments
Pioneer LaserActive CLD-A100 - Repair

Pioneer LaserActive CLD-A100 – Repair/Recap & Modules full Recap.

Defects:

  • The Game cartridges on the Sega Genesis Module do not work but the games on CD-ROM work correctly.
  • The INTF Ass’y Interface has some leakage capacitors and in short circuit.
  • The PSU has some leakage capacitors and in short circuit.
  • Solder joint jumped out on the three connectors that connect the two horizzonal/vertical motherboards.
  • Some cold solder on the power stage.

Works that have been done:

  • Cleaning and Full Recap PSU.
  • Cleaning and Full Recap Sega Genesis/Sega CD PAC-S10 Module.
  • Cleaning and Full Recap Nec PC Engine PAC-N1/N1 Module.
  • Cleaning and Recap INTF Ass’y Interface.
  • Rebuilding PADs of the two pcb connectors.
  • Rebuilding cold solder joint on the power stage.

Pioneer LaserActive CLD-A100 Gallery:

Sega Genesis/Sega CD PAC-S10 Module Gallery:

Nec PC Engine PAC-N1/N1 Module Gallery:

ZOE rev 2.0 Inty (Mattel Intellivision) RGB Interface

April 23rd, 2018 1 comment
ZOE rev 2.0 Inty (Mattel Intellivision) RGB Interface

ZOE rev 2.0 Inty (Mattel Intellivision) RGB Interface.

Some information about this revision:

  • The flat cable that connects the IDC 10+10 male socket to the 10+10 IDC female connector is about 15cm long (in the photo are: 20cm)
  • The cable that connects the 7 dupont connectors to the 8-pin DIN female panel socket is 30cm long (in the photo are: 20cm)
  • The video cable with a male SCART connector on one end and a 8-pin DIN male on the other side is 2 meters long.
  • The audio cable with dupont connector from one end and to solder on the other side is 20cm long.
  • The ZOE pcb must be fixed with 3 bioadhesive supports.
  • Status LED.
  • Improved audio output, there are a little less background noise.
ZOE rev 2.0 Inty (Mattel Intellivision) RGB Interface

The 8-pole DIN female panel socket can be positioned, after drilling, at any place. I recommend using the RF output hole, removing the RF modulator which is no longer usable after the modification.

This mod like the previous one works ONLY with Mattel Intellivision consoles equipped with the LM1886 (D/A Video Matrix Converter) chips. Example: PAL/SECAM but not UK/NTSC (USA). Better to check, open the console and check.

For console disassembly, desoldering the LM1886 or other connections you can consult the documentation of the previous version.

Gallery:

Soon available for sale.