J
Jim Thompson
On Fri, 06 Jan 2006 09:46:11 GMT, Robert Baer
[snip]
There may still be some devices that will convert RS-232 levels to
TTL and some that go the other way.
RS-232 -> TTL = MC1489
TTL -> RS-232 = MC1488
These chips are still available more than 40 years after I designed
them ;-)
These chips adhere to the original RS-232 spec.
<snip>
1488 requiring several supplies -- and runs hot as a pistol, too.
360mW typical ;-)
I've
got a box of both; they were about all there was to use in the market
and worked well when I was using them; but don't use them much now
because of the power requirements (especially the 1488) and the
serious heat to be removed (again the 1488 much more than the 1489, if
memory serves, but neither of them slouches in the heating
department.)
Jon
Keep in mind this was early '60's.
Quite a few process capability improvements since then.
...Jim Thompson