Re: TI-H: Re: Ir Link compatability
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Re: TI-H: Re: Ir Link compatability
Then why does it work? Think about what you wrote, do it twice, the second time
in reverse, what do you get? It works with the $serial link. i have not even
used a graphilink cable.
Osma Suominen wrote:
> Gregory Whitmore wrote:
> > I have only tested it with the TI-92, it works fine with no added
> > software. I have done nothing with the expander SF. I have not done
> > testing with any games.
>
> Sorry to say this, but I refuse to believe that your IR link actually
> works. None of the parts does any TI protocol-to-RS232 and vice-versa
> conversion, and the send and receive modules are too simple to send the
> states of both link port pins in both directions, so there is no way
> information could be transmitted over the link! Also, what the $4 serial
> link does is that it converts the TTL voltage levels of the link port to
> RS232 voltage levels, and MAX223 does the same procedure backwards, so the
> result is again TTL. In effect, the whole circuit seems to work so that one
> of the link port pins is connected "directly" (with a stupid voltage
> conversion in between) to the Tx module and the other link port pin
> similarly to the Rx module. This is not enough to send any data over the
> link with the TI protocol. It would work with the RS232 protocol, but the
> TI doesn't use it. The only way to make your IR link work is to use Graph
> Links instead of the $4 serial links.
>
> Have you only tested with Graph Links? Have you ever successfully sent e.g.
> a string of data over the link, or only tested that it can send and receive
> voltage states?
>
> As of now, I believe that either your IR link is a hoax or that you don't
> know enough electronics to build one that works and test it adequately.
>
> -Ozone, a skeptic
>
> --
> *** Osma Suominen *** ozone@clinet.fi *** http://www.clinet.fi/~ozone ***
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