8-bitters and multi-whatever

Roy J. Tellason rtellason at verizon.net
Wed Sep 12 18:56:02 CDT 2007


On Wednesday 12 September 2007 19:45, Ensor wrote:
> Hi,
>
>   > You don't even need "rs232 levels".
>
> MIDI is a "current loop" interface isn't it?

Yup!

But my point is that in prototyping some small SBC the rs232 stuff is about 
the only thing on there typically that needs other than logic power (+5V) 
unless there's some analog stuff there on the board that needs it.

MIDI,  in every implementation I've ever seen,  uses only a 5V supply.

I never did understand why current loops weren't used more...

-- 
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space,  a critter that can
be killed but can't be tamed.  --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James 
M Dakin




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