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Posts Tagged ‘modding’

GIG Leonardo Composite Mod

January 16th, 2018 No comments
GIG Leonardo Composite Mod

Video Composite modding:

  • Removed the RF modulator.
  • Removed one pin of the 3 resistors (see photo) for the video composite output, you can get a better image (contrast and color) (see photo)
  • I have used the same hole of the RF cable for the composite video and audio cable.

Gallery of the Video Composite mod:

 

Acetronic (Radofin 1292) MPU-1000 Composite MOD

November 8th, 2017 No comments
Acetronic (Radofin 1292) MPU-1000 Composite MOD

This Video Composite MOD needs some work unlike other similar consoles, you need to remove a resistor and insert a trimmer, otherwise the Video Composite output signal is really bad.

Works that need to be done:

  • Remove the RF Modulator (remove it completely)
  • Remove the 4.7k Resitor (see photo)
  • Solder a 22k Trimmer between the resistor hole (hole side to pin 8 of the TEA 1002/PE1X) and the ground, the third pin of the trimmer is the Video Composite output. (see photo)
  • Solder a wire for the Audio output. (see photo)
  • Use the same hole of the RF cable for the new video and audio cable.

Before closing everything i recommend to adjust the trimmer for the best Video output.

Gallery of the Video Composite MOD:

Interton Electronic Video Computer VC4000 Composite MOD

October 7th, 2017 2 comments
Interton Electronic Video Computer VC4000 Composite MOD

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:

Olivetti Prodest 128S (Acorn BBC Master Compact) Modding

September 25th, 2017 No comments
Olivetti Prodest 128S (Acorn BBC Master Compact) Modding

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 (https://ianstedman.wordpress.com/2015/01/25/gbs-82xx-experiments-part-2/)
  • 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:

Olivetti Prodest 128S (Acorn BBC Master Compact) Modding

Gallery of work that was done:

Download:

Hyperkin Supaboy S – RGB Svideo Hack

August 24th, 2017 5 comments
Hyperkin Supaboy S RGB-Svideo HACK

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:

Hyperkin Supaboy S RGB-Svideo HACK

Gallery of the work that was done:

Texas Instruments TI-99/4A – Alpha-Lock Joystick Fix

October 23rd, 2016 No comments
Texas Instruments TI-99/4A - Alpha Lock Joystick Fix

Texas Instruments TI-99/4A – Alpha Lock Joystick Fix.

This mod fix the problem of the alpha-lock key that need to be up or down when you are using joysticks.

The instructions for the Alpha-Lock Joystick Fix can be found here

Texas Instruments TI-99/4A – CPU Overclocked at 3.58mhz

October 23rd, 2016 No comments
Texas Instruments TI-99/4A - CPU Overclocked at 3.58mhz

Texas Instruments TI-99/4A – CPU Overclocked at 3.58mhz

This project allows you to increase the speed of your console from 3mhz to 3.58mhz. It might not sound like a big increase but this is a 20% increase in speed and it is easily noticable.

The instructions for the CPU Overclock modding can be found here

Gallery:

Texas Instruments TI-99/4A – Internal TMS5220 Speech Synthesizer

October 23rd, 2016 No comments
Texas Instruments TI-99/4A - Internal TMS5220 Speech Synthesizer

Texas Instruments TI-99/4A – Internal TMS5220 Speech Synthesizer.

The instructions for the internal assembly of the TMS5220 Speech Synthesizer can be found here

Gallery of the works that have been made:

It could be better!

I had severals problems with the free space inside the TI-99/4a, maybe i have put too many things … but everything works perfectly :D

Texas Instruments TI-99/4A – 32k Internal Exp. + Status LED + Reset

October 23rd, 2016 No comments
Texas Instruments TI-99/4A - 32k Internal Expansion Memory + Status LED + Reset

Texas Instruments TI-99/4A – 32k Internal Expansion Memory + Status LED + Reset.

Works that have been made:

  • 32k Internal Expansion Memory.
  • Switch for disable the Expansion Memory.
  • Reset Pushbutton switch.
  • Bi-Color LEDs to display the status of the internal memory expansion 32k. (ON = Green / OFF = Red)
  • Replaced the resistor for the LED from 2.2k to 220 ohms.

Gallery of the works that have been made:

It could be better!

I had severals problems with the free space inside the TI-99/4a, i had to remove one side of the metal part, the biggest problem is the internal 32k expansion which is not very well done, there is no a way to secure it inside … but everything works perfectly :D

Texas Instruments TI-99/4A – F18a Installation

October 23rd, 2016 1 comment
Texas Instruments TI-99/4A - F18a Installation

Texas Instruments TI-99/4A – F18a (FPGA Based TMS9918A) Installation.

Works that have been made:

  • Installation of the F18a and removal the tape connector to make a opening for the vga connector.
  • The metal cover is no longer used.
  • RCA 2 DIN Homebrew Adapter to use the audio output after installing the F18a on the TI-99/4a.

Gallery of the works that have been made:

Logitech Dual Action Arcade inside a ION Icade

September 25th, 2016 No comments
Logitech DA Arcade inside a ION Icade

As you can see this is a control pad of the Ion iCade case. It is designed to fit an iPad and has a built in stand for holding it.

The iCade is designed to work as a Bluetooth keyboard of sorts with an iPad.

It uses a standard arcade control wiring and is very easy to modify it to work with any interface can convert the signal from Analog to USB, like the PCB of a Logitech Dual Action joypad.

Gallery:

Commodore 64 IRQ Bicolor LED

March 4th, 2011 3 comments

This is a very old project published in a Dutch magazine to capture the state of the IRQ for Commodore 64 (vic-20) with a LED. After many years i have decided to make it.

On the photo you can see the project and the right connections on the cartridge port.

Components:

  • 1 x IC 74LS04.
  • 1 x Bicolor LED.
  • 2 x 330 ohm resistors.
  • Tiny wires.

How it work?

When the CPU generates an IRQ the green LED lights up, otherwise is red, if the irq is turned on and off quickly the led is orange.

 

Aoyue 474A+ Desolder and Test – C64 Motherboard

October 20th, 2010 2 comments

I wanted to try my new desoldering station Aoyue 474A+ with the motherboard of the Commodore 64, i have unsoldered all chip and i have added a socket. It works so good and is so fast.