TI-H: Re: New expander
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TI-H: Re: New expander
What would happen if someone made a new expander, that used 7 chips, instead of one, since you can have up to 7 different chips(addresses) on the bus of the calc. I know that with the temp sensor, you can have up to 7 different sensors(different addresses), and we could just change those sensors (and schematics) to the EEPROM chips, and then we could have a (hopefully) new , inexpensive expander!
I am just thinking, so, don't flame me because I might not know what I'm talking about.
Jeff Dezur
jeffd@gcsi.net
-----Original Message-----
From: Osma Suominen <ozone@clinet.fi>
To: ti-hardware@lists.ticalc.org <ti-hardware@lists.ticalc.org>
Date: Monday, October 13, 1997 12:56 PM
Subject: RE: TI-H: Ti Modem
>Christopher Kalos wrote:
>> remembering what I just sent involving tcp/ip and ex*nders, if we had it over
>> i2c, then we might not have a problem :)
>
>Currently, we do. There are two main reasons for this:
>1. Nobody has yet made an I2C expander. The ESF uses its own protocol and
>others use the TI protocol. An I2C EEPROM would work, but the biggest one I
>know of is only 128kbits, which is 16 kBytes. Not worth the effort.
>
>2. Nobody has yet made a serial port device that connects to the calc via
>I2C. In fact, the only serial port hardware around is the TI Graph Link,
>that certainly doesn't use I2C but the TI protocol.
>
>-Ozone
>
>> Osma Suominen wrote:
>>
>>> I'm not saying it's impossible, but there's not much point in it. The
>>> calculator has too little RAM to spend to protocols like TCP/IP, PPP, FTP
>>> and HTTP. Instead, I'd dial up an ISP with a Unix shell and use Unix
>>> through the serial link with the calc as a terminal. I've never used ZTerm,
>>> but I think it's VT100 compatible, at least to some extent, so that should
>>> work fine (someone said he'd done this).
>>
>> Oh, and before you suggest using some sort of a memory expander, think
>> about where it should be connected...to the link port. And using the TI
>> protocol, we can't have two devices in the same port.
>>
>> -Ozone
>>
>> --
>> *** Osma Suominen *** ozone@clinet.fi *** http://www.clinet.fi/~ozone ***
>>
>>
>
>
>--
>*** Osma Suominen *** ozone@clinet.fi *ttpww.cnet.fi/~ozne ***
>
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