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Posts Tagged ‘modding’

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 No comments
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.