🚀 go-pugleaf

The Graph-Link cable contains proprietary circuitry that (I think) only
serves the purpose of converting the TI-85 electrical signals to a
voltage and timing format of the RS-232 (serial) port on a PC.

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On Tue, 29 Nov 1994 V064Q5C3@ubvms.cc.buffalo.edu wrote:

> Philip Dearmore writes the following
>
> >Anyway, the thing is, I was browsing through some of the programs on the 85
> >archive and noticed that data can be sent by a program through a COM port to
> >the calculator.
>
> >Now, instead of paying the $70 that one costs directly from TI, would it be
> >feasable to make on by combining a stereo headphone type jack with a serial
> >cable?
>
> >If so, has it been done?  If so, could you send me technical specs on it so I
> >don't have to figure out which wires to connect to which other wires.  And if
> >this kind of data isn't available, would someone be willing to send me a
> >diagram of the pins on a serial plug so I don't have to just mindlessly probe
> >to find what the right connections are?
>
> >Thanks ALOT in advance.
>
> The jack which plugs into your calculator is not a stero plug.  It has three
> contacts.  To see this for yourself, dig up that old cable which came with
> your caclulator.  If you can find it, look at one end and you will see that it
> has three places to connect.  Therefore, even with pin diagrams, you cannot
> use an ordinary stero plug.
> 	Furthermore, I have hear that there is some proprietary circuitry
> inside the end of that plug.  So, even if you could find the pin out, and
> a plug with three connections, you still couldnt build a plug.  Sorry.
>
> Rick Seiden
> V064Q5C3@ubvms.cc.buffalo.edu
> You know your school cares when the give you an id like V064Q5C3
>
>