IO Board 6.1 Jumper Question

foldor
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IO Board 6.1 Jumper Question

Unread post by foldor »

I recently picked up an IO Board 6.1, and I wanted to know what the jumpers on the board do. Most specifically the on in the lower right corner of the picture below near the IO Port. I heard there's some jumper on the board to switch the fan from 3.3V to 5V, but I can't find any documentation on this board anywhere.

io61new.jpg
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rickdangerous
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Re: IO Board 6.1 Jumper Question

Unread post by rickdangerous »

By your photo is the green jumper, near to the fan connector. In that position is set to 3.3v (silent).
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foldor
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Re: IO Board 6.1 Jumper Question

Unread post by foldor »

What about the blue header? Or the white one for that matter? Do you know of any place that documents these things? It even took me a while to find someone talking about the SOG switch being for Sync on Green, which came in handy when I was hooking up via Component.

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Nat
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Re: IO Board 6.1 Jumper Question

Unread post by Nat »

The white jumper cap near P3 (5 pin external header connection), when removed assuming the trace on the board below is cut disables all your status LED's (power,disk,user) replace the cap and your have the LED's again, useful when playing in a dark room, or if you wish to have remote status LED's and disable the board mounted LED's.

The blue jumper cap next to the USER IO port is a voltage selector for the USER IO port, under normal use the jumper cap should be connected to the middle pin and the pin marked IO.
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legacypixels
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Re: IO Board 6.1 Jumper Question

Unread post by legacypixels »

Blue jumper selects what signal is present on the IO6 pin of the User Port. The 3.3v setting puts 3.3 volts on the pin (same as previous versions of the IO board), The IO setting makes it into an extra data pin (the "pin 7 mod" from older boards). SNAC users with 6 button game pads will use the IO position.
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foldor
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Re: IO Board 6.1 Jumper Question

Unread post by foldor »

legacypixels wrote:
Thu May 28, 2020 1:35 am
Blue jumper selects what signal is present on the IO6 pin of the User Port. The 3.3v setting puts 3.3 volts on the pin (same as previous versions of the IO board), The IO setting makes it into an extra data pin (the "pin 7 mod" from older boards). SNAC users with 6 button game pads will use the IO position.
Ok, so I have anew question. With the IO Board 6.1, what jumpers should I use with a new SNAC board? Does it need to be changed for 6 button pads, and then swapped back for NES pads? Does the SNAC board need the jumper?

Basically, I can't seem to find a lot of good documentation on SNAC, and the jumpers, even on the official Wiki.

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legacypixels
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Re: IO Board 6.1 Jumper Question

Unread post by legacypixels »

BLUF: I'd need to see which SNAC board design you have to evaluate your situation.

Background: The User port originally provided 6 data lines, GND, +3.3v and +5v. People discovered that you need 7 data lines for some controllers (eg: Sega 6 button). One solution was to run a jumper wire from an IO board data FPGA pin to a JST header on the SNAC. A second method was to cut the 3.3v line on the IO board (6.0 and earlier) and connect a data pin and pull-up resistor instead- the "7 pin mod". On IO v6.1 and Digital IO 1.2, Sorg integrated this modified function into the board design. A jumper chooses between the original behavior (3.3v) or the 7th data pin. (labelled IO6)

There's a couple different SNAC versions floating about, but generally speaking with a v6.1 IO board, you should be able to safely set the IO board IO6 jumper to "I/O" and connect the 7 pin jumper on the SNAC. You shouldn't have to change it back, unless you have some weird design SNAC that doesn't have a 3.3v regulator on it.

But just a follow up, I can't be sure of a particular setup without seeing the SNAC to make sure it isn't some weird design that breaks my assumptions, and could potentially damage your stuff.
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