Messages in this thread | | | Date | Sat, 1 Aug 1998 22:05:58 -0400 (EDT) | From | "Richard B. Johnson" <> | Subject | Re: GSM short message from |
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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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