Re: TI-H: ti linking
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Re: TI-H: ti linking
Actually, the software converts it to serial, by testing a bit, pulling
the correct line low, waiting for acknowledgement, then doing the
proccess over again
>Date: Mon, 13 Jul 1998 09:56:57 -0600 (MDT)
>From: Greg Hill <gregh@xmission.com>
>To: ti-hardware@lists.ticalc.org
>Subject: TI-H: ti linking
>Reply-To: ti-hardware@lists.ticalc.org
>
>
>On Mon, 13 Jul 1998, Eric M. Fiterman wrote:
>
>> Does that mean it uses some kind of MUX to transfer data? Rather
>> than a straight serial connection...
>>
>> I guess that way you keep synchronization with the same clock
speeds...
>
>By MUX you mean a multiplexer, right? No, there isn't any need for that
in
>this situation.
>
>I think what happens (without having looked at the actual ROM routines)
is
>the program OUTs a byte to port 7. Something (could be hardware or
>software) takes that byte and sends it serially. I don't know if the
byte
>goes MSB or LSB first, but in any case it does go one bit at a time.
>
>The connection is async (no clock signal). A calc will transmit a bit
and
>wait for an ack (ACKnowledge). If it doesn't arrive within a certain
>amount of time, the operation times out and an error is returned to the
>user.
>
>--
>Greg Hill
>greg-hill@bigfoot.com
>www.comports.com/link
>
>
>
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