[A83] Re: the link port
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[A83] Re: the link port
David Revelj wrote:
>I'm going to create some custom hardware (with power-source) for the linkpo=
>rt...so i'm looking for a little info on it. More specifically: how do i =
>avoid destroying my ti83 linkport? I feel that perhaps a little to much v=
>oltage or current will have that effect. Also i'd like to know what volta=
>ge you get from the linkport, and if it gets lower as the batteries grow =
>old.
>
>
First, try post this question to Ti-Hardware instead, it is specialized
for this kind of things.
Second. You shouldn' t even think about driving anything from the link
port, else then maybe a led.
probably not even that :)
The voltages are compatible with both TTL and CMOS logic, so I guess
they are somewhere between 3 and 5 volts for high and about 0 volts for low.
Canät check now since I have no ti83, and my 89 is out of batteries.
On the 89, writing a 1 on the link port means setting the line to low (0
V). I think its the same on the 83, but I don't know.
there are some projects out there, try google a bit and see how they did it.
I anyway recommend external power for anything taking more then 1 mA or so.
You could also solder in an extra plug in your calc for external
devices, that is wired directly to your batteries. That would be neet.
///Olle
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