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Mehridian Sanders

No pic No Sound help this fool! :)

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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

 

 

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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 ●○○○

15041be4360c86ea2f54fbf56a5f83d3.jpg

Sent from my SM-G955U using Tapatalk

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Sega genesis replacement adapter connections (while looking at the Male end)
left to right.
1-NC
2-Audio Out
3-GND for Audio and Video
4-NC
5-Video Out70b5afb74cbcbf0c1bca9227a1b317a4.jpg

Sent from my SM-G955U using Tapatalk

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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.)

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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.

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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?

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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)

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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. 

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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.

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