18 Aug
2015
18 Aug
'15
8:50 p.m.
On 8/18/2015 10:40 PM, drlegendre . wrote:
As part of my C-64 RS-232 to M15 60mA CL project,
I've put together a
simple MAX232 based interface to connect the TTL levels on the C-64 to the
standard RS-232 +/- levels.
Is there any reason that I can or cannot install LEDs - on either side of
the MAX232 converter - to give some indication of line status?
Specifically, a pair of LEDs, one each for Tx and Rx lines, to blink / etc.
as line status changes and data moves.
I don't see any obvious issue - but I can conceive of a situation where it
might screw up the line in some way I haven't considered.
Comments?
Probably "best" to feed the TTL RX and TX lines to a 74'04
and then hook
the output to a 330 ohm and then the cathode of a LED, with anode going
to 5V.
But, probably good enough is to just put the diode cathode on the TX and
RX lines, 330 ohm to 5V, and have fun.
Jim
--
Jim Brain
brain at jbrain.com
www.jbrain.com