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Retro_Game_Lover96

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About Retro_Game_Lover96

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    Chopper Commander
  • Birthday December 18

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    Guh-Huh!
  • Gender
    Male
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    USA
  • Interests
    cooking, modding the video game consoles, putting the puzzles together, watching cartoons
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    Various video games
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    Various video games

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  1. I found a solution, I used a different potentiometer, and guess what? It works like a charm! The pot is like this.
  2. Help! I’ve tried to install the mod, but the led is not blinking! It was working earlier.
  3. The audio works on my TI while it is connected from the audio pin from the original connector to the 8 pin din mini connector’s pins 1 & 2 because the TI has a mono sound just like the ColecoVision’s.
  4. How to add RGB on TI99/4A? Requirement tools/parts: A working TI99/4A Computer TMS-RGB Mod Board (Assembled) 8 Pin Mini Din Female connector 8 Pin Mini Din Connector Board from OSHPark (Optional) 8 Pin Mini Din Scart RGB Cable 3x 560 Ohm Resistors 1x TMS9928A Chip Some wires A Phillips Head Screwdriver A decent Soldering Iron Some Soldering Wires Desoldering Braid, Pump, or Hakko Desoldering Gun (If you want to do no-cut method) An OSSC, a Framemeister, a PVM RGB Monitor, or any Scart adapter (Required for RGB) Step 1: Unscrew all of the screws from the bottom of the TI99/4A and then carefully open it. Step 2: Unplug the power supply from the motherboard and unscrew all of the screws from the motherboard. And don't forget to take off the cartridge connector and take out the RF Shield, as well as the keyboard connector! Step 3: After you open the RF shield from the motherboard, you will see the TMS9918A Chip, so you need to remove it. If it is socketed, it is very easy to remove it. Then, replace it with the TMS9928A Chip. Step 4: You need to solder the TMS RGB Board onto the bottom of the VDP Chip like this: And solder the wires to the chip: And don't forget to feed the wire for the audio which is Pin 3 of the TI's Video connector. Step 5: Solder the three 560 Ohm resistors to those places like those: Step 6: If you want to do no-cut method, simply desolder the original video connector off from the board and feed all of the wires to the 8 pin mini din connector. Step 7: Test is to make sure it works before putting the TI back together. (If it works, then move on. But, if it doesn't work, check your work and try again.) Make sure you mount the RGB connector! Step 8: Carefully put the console back together, and then enjoy!
  5. Ooh-de-lally! It works like a charm after I added the 560 ohm resistors, so I finally got color via TMS RGB!!!
  6. My pot is 1 Mega ohm. Also, I will try to move the black wire to the middle of the pot to see it works. https://www.ebay.com/itm/Radio-Shack-271-0211-1M-Ohm-Linear-Taper-Potentiometer-500VDC-5W-New-2710211/274437732275?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
  7. Hi, I made the Atari controller, so everything is working except the paddle, so I don’t know why.
  8. Well, I did the TMS RGB mod on my ColecoVision, and it is a lot better than the other one, so it is an easy installation.
  9. So I do need 560 Ohm resistors to make it work.
  10. I’m not sure it’ll help to solve the issue to get the colors via TMS RGB.
  11. Before I did the RGB mod, the TIA chip is fine while it originally has a composite mod.
  12. Hi, I have bought an RGB mod kit for my six switch 2600, I have installed and tested it with composite, but the screen is all messed up. Maybe it could be a bad tia or something that caused it.
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