Retro_Game_Lover96
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Posts posted by Retro_Game_Lover96
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Before I solder the RGB board, does it look like this?
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3 hours ago, ChildOfCv said:The video signals will connect to the DIN the same way they do on the CV. The audio... you'll have to find out where the TI prepares for final output on that. Looks like pin 3 of the monitor port will work.
The pin of TI’s video connector will work for the audio for the RGB mod.
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39 minutes ago, arcadeshopper said:Looks like you attach it under the chip
https://tms-rgb.com/guideInstall.html
Sent from my LM-V600 using Tapatalk
I know that, and it is the same thing as the ColecoVision version.
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Hey, I have a TI99 4A computer, a TMS9928ANL chip, a TMS-RGB mod board (the ones I got from Mobius), and an 8 pin mini din connector, so does anyone explain how to install the RGB mod and feed the audio?
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I have simply ordered 2 RGB boards from Mobius, and I can't wait to work on those.
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I am so eager about those boards.
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On 7/25/2020 at 3:26 PM, Retro_Game_Lover96 said:I think you should count me for two boards, one for my ColecoVision and one for the TI-99 4/A and I have to use the 9928 to get it working.
If I see the TMS-RGB mod boards are in stock on Mobius Strip site, I will be ordering two of those.
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I think you should count me for two boards, one for my ColecoVision and one for the TI-99 4/A and I have to use the 9928 to get it working.
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If I am going to plan on the TI 99 RGB, I could replace the 9918 chip that the TI was originally used with 9928 to RGB mod it.
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7 hours ago, Tursi said:Yeah, you can, I've tested a 9928 in an NTSC TI before.
If you can get one!
So, it is possible to use the 9928 chip on the TI, so unlike the Coleco, the TI’s chip is socketed rather than soldered on.
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1 hour ago, Falonn said:You could go the completely-from-scratch route and just order all the things mentioned on this page.
That's how I built mine.
Okay, or maybe I would wait until the assembled version comes out.
I think it will also work on TI-99/4A because it uses the same chip as the ColecoVision's.
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Is there a way to order this cool looking RGB board yet?
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Are those F18A kits available yet?
So, I wonder when they are available, and I could give my ColecoVision a VGA mod.
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That was a relief. I got that mod working.
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1 hour ago, Kernel said:Yes, another thread on this...apologies in advance if I have not dug enough.
I am trying to troubleshoot my CV that has glitching as these pics show:
I know the power supply is fine as I've tested it, but I also purchased a COLUSB on the off chance I was not using the multi-meter correctly. I'm still a novice at this sort of stuff.
I've also un-soldered, trimmed/cleaned the power cables and re-attached them to no avail (the ground had what looked like corrosion on it, so figured it was worth a try).
I know that this could be anything really, so before I pull off the power switch and try that fix, and before I pull the RAM and try that, and before I try to replace the video chip, what I'm looking for is some guidance on where I should test for power on the board to ensure it's flowing properly. I've found the technical manual and schematics by way of the god that is google, but other than 2 other threads here, I have not found info on how to test the various chips for proper connectivity. I'm thinking I just haven't looked int he right place.
The threads I've seen so far that have some info that I am going to try are:
^^ I have a logic probe on the way so I can complete this step.
Any help/pointers would be appreciated. I know I can buy a new one from ebay and probably just move on, but I really want to be able to save this thing and hone my troubleshooting and soldering skills.
Thanks.
I fixed my ColecoVision graphics with the 5v Ram mod and replacing the power switch.
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Well, have you seen some other work that people did?
https://circuit-board.de/forum/index.php/Thread/17431-Colecovision-Ti99-RGB-MOD-Projekt/
I think the trimmer pot for the sync that has 103 code, so that should be 10k ohms.
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I think I have heard some people added the trimmer pot for the sync on the RGB board.
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Look at that picture, that RGB mod board has an extra pot, so I wonder where it goes?
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29 minutes ago, ChildOfCv said:The mod has a jumper to set the style of sync, so it would be instructive to find out what that jumper is set on.
Hmmmm
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The NESRGB, the one's I did not mod has the SNES styled multi out connector.
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5 hours ago, ChildOfCv said:Find a short length of wire, strip both ends. Place one end on one side of R1. Place the other end on the other side of R1.
Alternatively, you could use your meter probes by sticking them on both sides of R1 and then angling both probes so that they contact each other. Alternatively, set the meter in amps mode, make sure the probes are plugged into the appropriate outlets for reading amps (some meters use an alternate outlet), and then put a probe on each side of R1.
I tried, but it didn’t work.
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10 hours ago, ChildOfCv said:Bypassing R1 on the PSI board with a jumper wire help?
Here is my RGB board like this, so how do I bypass R1 with a jumper wire?
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2 hours ago, ChildOfCv said:So, what's the resistance reading?
And does bypassing R1 on the PSI board with a jumper wire help?
I don't know the bypass R1 on the RGB board with a wire could help or not.
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RGB Mod Explanation
in TI-99/4A Computers
Posted · Edited by Retro_Game_Lover96
Welp, I am certainly having the hard times to get this mod working.
Despite having the 9918 chip replaced by 9928 chip.
UPDATE: The sync is working, but there are no colors.