Retro_Game_Lover96

Could the TMS RGB work on the Coleco ADAM, so I think the ADAM’s chip is different compared to regular ColecoVision’s VDP. I think I should try on that.

I found a solution, I used a different potentiometer, and guess what? It works like a charm! The pot is like this.

Help! I’ve tried to install the mod, but the led is not blinking! It was working earlier.

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.

Alright

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!

Ugh, I tried, but it’s not working!

Ooh-de-lally! It works like a charm after I added the 560 ohm resistors, so I finally got color via TMS RGB!!!

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

Hi, I made the Atari controller, so everything is working except the paddle, so I don’t know why.

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.

How fascinating?

So I do need 560 Ohm resistors to make it work.

I’m not sure it’ll help to solve the issue to get the colors via TMS RGB.

Before I did the RGB mod, the TIA chip is fine while it originally has a composite mod.

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.

Where and what are the jumpers W202 and W204 of the TI?

So I finally bought the RGB mod board for my six switch, I installed it, but the graphics are garbled, maybe the TIA is bad, or maybe it could be something else? Any ideas to get the graphics fixed?

I was working on my Atari RGB mod, I tested it with composite, but I got garbled graphics. Maybe it might be the bad chips, or it could be anything wrong.

Are you sure this’ll work?

Maybe it might be a crystal oscillator, but I’m not sure.

Are you sure it will work?

I think swapping the vdp from 9918 to 9928 would make the console RGB moddable. I tried on my TI 99 4A, but I got a black and white screen, so has anyone done that?

Does anyone come up with a solution for this problem I have? Despite the RGB mod is working on my TI?

Hey guys, I’ve gotten the RGB board installed on my TI 99 after replacing the 9918 chip with 9928 chip, but I have this stupid B&W screen.