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SEga Naomi JVS I/O board output pins

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cyclemat

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on the Sega JVS pin 51 to 56 are outputs did anybodyy know is it positiv or negativ output ?and when positiv 12v or 5v ?
 
I believe they're 5V/0V and not powerful enough to drive much more than an LED or a small bulb. (they're designed to go directly to lamps, or to a relay bank if driving something more current hungry like a gun solenoid)

I believe they're inverted outputs but don't quote me on that. if you've got a multimeter you can confirm pretty easily.
 
In my research and subsequent duplication of behavior in my custom JVS I/O, the outputs sink current to ground. They don't provide power. So a lamp would have 5 or 12 on the positive lead and the negative lead would go to the output pin.
 
winteriscoming said:
In my research and subsequent duplication of behavior in my custom JVS I/O, the outputs sink current to ground. They don't provide power. So a lamp would have 5 or 12 on the positive lead and the negative lead would go to the output pin.
Click to expand...
do they have a 5V pull up or are they floating?
 
twistedsymphony said:
do they have a 5V pull up or are they floating?
Click to expand...
I didn't dig that far into it, honestly. The Sense line uses a pull-down resistor, so I would think the outputs might behave similarly. You would want the transistor kept low until the output is activated to open the gate to ground. In my JVS design, I put in spots for optional pull-downs for the outputs, but they work fine floating.
 
This is a relevant topic to me right now. I have a Crazy Taxi upright that has a burnt bulb in the start button. The light is powered by 5V. I bought a LED that will fit the socket, however, the LED needs 12V. I looked up schematics from a few different games, but not one had 12V current connected to an output.

If no-one here has any first hand experience, I'll just try it and report back.
 
I recall seeing Initial D 4 schematics where lamps are 12v.

It "should" just be a matter of running 12v to the + lead of the LED from any nearby source. It could come from a 12v pin on the I/O, but there may be a closer source such as some other nearby wire coming from the power supply. Then the - lead would go to the appropriate output. Having said that, I do not know for sure if the outputs on a stock Sega Type 1 are up to the task of sinking 12v, but given that the board has the capacity to provide 12v, I would guess it will probably be ok.

It might be safer to use a 5v LED.
 
Works just fine.

So the outputs can handle at least 12V.
 
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