Mehridian Sanders Posted September 22, 2019 Share Posted September 22, 2019 Just hooked up my newish TI-99/4a to an atx power supply. Bypassed the power board and fed it straight into the mainboard. I carefully placed the 12v, 5v, -5v, and the gnd cables as they were fed from the power board. I got power from the supply flowing and the av out went to a vizio TV av cable. Got no sound no pic. Pictures to follow shortly. Sent from my SM-G955U using Tapatalk Quote Link to comment Share on other sites More sharing options...
Mehridian Sanders Posted September 22, 2019 Author Share Posted September 22, 2019 Here we goSent from my SM-G955U using Tapatalk Quote Link to comment Share on other sites More sharing options...
Mehridian Sanders Posted September 22, 2019 Author Share Posted September 22, 2019 Better pics and connections: ◇Main pin 14 connected to Main pin 15◇Yellow wire from atx main pin 10 (12v)To TI mainboard ○●○○◇Red wire from Main pin 20 (5v) to TI mainboard ○○○●◇Black wire from Main pin 7 (GND) to TI mainboard ○○●○◇White wire from Main pin 18 (-5v) to TI mainboard ●○○○Sent from my SM-G955U using Tapatalk Quote Link to comment Share on other sites More sharing options...
Mehridian Sanders Posted September 22, 2019 Author Share Posted September 22, 2019 Sega genesis replacement adapter connections (while looking at the Male end)left to right. 1-NC2-Audio Out3-GND for Audio and Video4-NC5-Video OutSent from my SM-G955U using Tapatalk Quote Link to comment Share on other sites More sharing options...
Mehridian Sanders Posted September 23, 2019 Author Share Posted September 23, 2019 Apparently it helps when you plug the Audio out into the Audio instead if the video.. Sent from my SM-G955U using Tapatalk 3 Quote Link to comment Share on other sites More sharing options...
wierd_w Posted September 23, 2019 Share Posted September 23, 2019 Excellent! This means a simple breakout board for a picoATX (20pin!! NO 24 pin!!) would work great with a Ti 99/A4. That would fit neatly inside the case. (PicoATX is smaller than the original power board.) 2 Quote Link to comment Share on other sites More sharing options...
Mehridian Sanders Posted September 23, 2019 Author Share Posted September 23, 2019 It would work perfectly. I took your suggestion and found that old ATX 1 I had.Demo Link... don't judge too harshly. Playing 1 handed while filming.http://imgur.com/gallery/O2TrJOESent from my SM-G955U using Tapatalk Quote Link to comment Share on other sites More sharing options...
wierd_w Posted September 23, 2019 Share Posted September 23, 2019 External ATX is unelegant, but is a good showing that the signals will work fine. PicoATX is a mass produced consumer product, and a breakout board would be cheap to manufacture. Quote Link to comment Share on other sites More sharing options...
tater1337 Posted September 23, 2019 Share Posted September 23, 2019 7 hours ago, wierd_w said: External ATX is unelegant, but is a good showing that the signals will work fine. PicoATX is a mass produced consumer product, and a breakout board would be cheap to manufacture. is there a thread here about Pico ATXconversion? 1 Quote Link to comment Share on other sites More sharing options...
wierd_w Posted September 23, 2019 Share Posted September 23, 2019 No, I only recently mentioned it in the "PSU replacement?" Thread. I cited what pins in the 20 pin header you need, and what they go to. I am kinda surprised that the community designs custom VDUs, but there's no PicoATX breakout. It should be a drop in replacement with such a board. (Shrug) 1 Quote Link to comment Share on other sites More sharing options...
Mehridian Sanders Posted September 23, 2019 Author Share Posted September 23, 2019 1 hour ago, tater1337 said: is there a thread here about Pico ATXconversion? It's surprisingly easy. I had my doubts at first but after taking a leap of faith ... works just fine. 8 hours ago, wierd_w said: External ATX is unelegant, but is a good showing that the signals will work fine. PicoATX is a mass produced consumer product, and a breakout board would be cheap to manufacture. I agree. It is. With the removal of the original power board, there is a LOT of space right up front. In truth, there is a lot of space in there, in general. 1 Quote Link to comment Share on other sites More sharing options...
Mehridian Sanders Posted September 23, 2019 Author Share Posted September 23, 2019 Oh for anyone trying to get a replacement AV cable. I bought mine at a brick and mortar store. Sega Genesis Replacement cable. I think I paid $8 for it. Here is a link to a cheaper one : https://www.amazon.com/Mizar-Replacement-Sega-Genesis-Standard-Cable/dp/B002FY0CM0?th=1 Quote Link to comment Share on other sites More sharing options...
GDMike Posted September 24, 2019 Share Posted September 24, 2019 I suppose the heat loss is min. Quote Link to comment Share on other sites More sharing options...
wierd_w Posted September 24, 2019 Share Posted September 24, 2019 Upon further reading, I seem to find that pretty much every PicoATX (even the 20 pin versions) do not provide the -5v rail, because they consider it to be a legacy feature that nobody needs. That means that a breakout board for one will need one of these baked into it to provide the missing -5v rail. Should still be inexpensive though. Quote Link to comment Share on other sites More sharing options...
+arcadeshopper Posted September 24, 2019 Share Posted September 24, 2019 or use this: https://www.digikey.com/product-detail/en/mean-well-usa-inc/GP25A13A-R1B/1866-1825-ND/7703336 Quote Link to comment Share on other sites More sharing options...
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