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SubjectRe: GSM short message from
On Sat, 1 Aug 1998, Mike A. Harris wrote:

> On Sat, 1 Aug 1998, Richard B. Johnson wrote:
>
> > > 40 characters or so, but capital letters generate codes that have
> > > more bits turned on resulting in a higher draw on the UART. Many
> > ^^____________
> >
> > (char) 'A' == (char) 'a' & 95;
> > (char) 'Z' == (char) 'z' & 95;
> >
> > He was trying to save bits! Upper case uses less bits, so the BPS can
> > be higher if your communications channel is bit-limited like the
> > Micro$oft browser.
>
> Ahh, but everything is inverted on the phone line. A logic 1
> (high) becomes a SPACE, and a logic 0 becomes MARK out of the
> UART. If you measure consumption with a DSO like I have, you'll
> see that it in fact wastes electricity.
>
> So yes, ucase ascii uses less "1" bits than does lowercase ascii,
> however it is inverted out of the UART. Check it with a scope.
>
We'll have to agree to disagree. In the absense of data, my modem
transmits pseudo-random junk. Data are XORed into this -- except
in the case of Micro$soft where there is no difference......:(
Cheers,
Dick Johnson
***** FILE SYSTEM MODIFIED *****
Penguin : Linux version 2.1.111 on an i586 machine (66.15 BogoMips).
Warning : It's hard to remain at the trailing edge of technology.

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