ard at p850ug1.demon.co.uk
Fri Dec 2 18:09:40 CST 2005
> USB is something of a miracle I'd have to say. Many good success
USB seems to me to be the interfacing equivalent of certain GUI-based
systems, in that it makes easy jobs trivial and difficult jobs almost
USB probably works fine if you want to do what the manufacturers
intended. But if, like me, you want to hack about, it appears it would
really get in the way...
I think I've mentioned before that my old-ish HP calculators have
built-in RS232 ports. HP's intention was that you linked these to a PC
and saved/loaded stuff (there's kermit and Xmodem in ROM on the
calculator). But they work equally well to link to a serial printer or to
a home-made data logger, or...
The replacement has a USB port. It probably works fine with a PC to
load/save programs and data. But it won't link to a printer or to a data
Since learnign how to wire an RS232 cable, I've never had any problems
with RS232 interfaces if the documentation is complete (and if it's not,
it's not that hard to work out what signals are needed).
Of course the fact that none of my computers have, or could have, a USB
interface is another matter....
Oddly, not being a programmer, I much prefer a command-line driven system
to a GUI.
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