Re: TI-H: ti linking
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Re: TI-H: ti linking
What do you mean, convert it to serial? :) Nothing happens when you
convert it to parallel. All you do is take the binary number and shove it
bit by bit.
>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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