Re: inferred?

To: CALC-TI@LISTS.PPP.TI.COM
Subject: Re: inferred?
From: Brett Gengler <bgengler@IDCNET.COM>
Date: Thu, 2 Oct 1997 01:25:15 -0500
Comments: To: mtm@maurano.com
References: <c=US%a=_%p=CF%l=CIIES001-971006192551Z-99114@ciies001.con-way.com> <19971007.154100.3262.4.c82@juno.com> <343e2c78.220921777@nntp.best.com>
Reply-To: Brett Gengler <bgengler@IDCNET.COM>

Making a radio link could be implimented without a microcontroller....but I
think it would be MUCH easier to do so.  If you run the MCU freq. at >2x the
Ti-xx's freq. you could send the data multiple times without slowing down
data transmittion(so kind of error control).  Using a chip with hardware
serial transmission built in would make the task much simplier.  With a MCU
you won't have to have to use two transmitters/receivers either.  You can
synchronize the calc's with one data stream if the freq. is higher than the
calc's port 7 data transmission rate.  The ultimate goal would have the
radio link operate exactly like a cable according to the calc.  Sounds like
a fun project for an experienced RISC programmer.  Personally,  I'm familar
with programming motorola MCU's but not THAT familar that I'm just going to
whip one up :_)

Matt Maurano wrote:

> Man, that'd be cool. All the kids hunched over their calcs talking,
> with the teacher droning on.
>
> Anyway, his problem with radio is that it is imperfect. An incorrect 0
> or a 1, and you are screwed, esp with an asm prog. You would need
> error correcting software, either on a chip or in zshell.
>
> On Tue, 7 Oct 1997 15:35:12 -0400, d d d <c82@JUNO.COM> wrote:
>
> >On Mon, 6 Oct 1997 21:50:55 GMT Reinier Zwitserloot
> ><R.Zwitserloot@BTINTERNET.COM> writes:
> >>One of the problems with Radiolink is that signals get distorted,
> >>whatever you do. Try walking around the house with your phone.. you
> >>will always hear some static. -----> An RT Link would *NOT* work in
> >>the ti-os. You'd have to write a special program in zshell or
> >>alternatively use a PIC chip in the RT unit. *
> >
> >
> >You must have a really old phone, or a cheap one.  I have a 10 year old
> >Uniden, and I don't get static until I am outside.  Then I have a new
> >Sony that I can go 5 or 6 houses down the street and still get good
> >reception.
> >
> >
> >>
> >>Then again, I doubt this would be used for anything but pinging text
> >>across not only a room, but across half the school.
> >
> >This would be cool:)  Writing to friends in different classes :P
> >
> >
> >
> >
> >
> >
> >-calc82  c82@juno.com
> >WANTED:TI-92, prefer something like broken link port to make it CHEAP.
> >TI-82 for sale

References:

Re: inferred?

From: "Williams, Matt" <Williams.Matt@CON-WAY.COM>

Re: inferred?

From: d d d <c82@JUNO.COM>

Re: inferred?

From: Matt Maurano <mtm@maurano.com>