Add an eleventh-hour gimick... But since it's only in `games' and

Jordan OK'ed it, i think it's a nice one for those who need it.  I
once mentioned in Usenet that i've hacked morse(6) so it can control
an external device like a tone generator or even a ham radio
transceiver, so you could actually use that `game' for really
transmitting morse code through the air.  A couple of people then
bugged be to send them my hack (which it was by that time).

So i've now finally found some hours to clean it up (like freaking out
with the transmitter no longer keyed in case someone ^c's out of the
program...), and to write the man page addition.

While i was at it, i also cleaned up some minor nits in Lyndon's
/dev/speaker code, mainly #ifdef related stuff like handling getopt()
if SPEAKER is not defined etc.

enjoy & 73

Approved by:	jkh, the restless...

1 files changed, 43 insertions, 5 deletions

diff --git a/games/bcd/bcd.6 b/games/bcd/bcd.6
index e06dafe..732a4ee 100644
--- a/games/bcd/bcd.6
+++ b/games/bcd/bcd.6
@@ -47,6 +47,8 @@
 .Op Ar string ...
 .Nm morse
 .Op Fl p
+.Op Fl d Ar device
+.Op Fl e
 .Op Fl w Ar speed
 .Op Fl f Ar frequency
 .Op Fl s
@@ -61,28 +63,44 @@ read the given input and reformat it in the form of punched cards,
 paper tape or morse code respectively.
 Acceptable input are command line arguments or the standard input.
 .Pp
-Available option:
+Available options for program
+.Nm morse :
 .Bl -tag -width flag
 .It Fl s
 The
 .Fl s
-option for morse produces dots and dashes rather than words.
+option produces dots and dashes rather than words.
 .It Fl p
-Send morse the real way. This only works if your system has sound
-support and if the program understands your audio hardware.
+Send morse the real way. This only works if your system has
+.Xr speaker 4
+support.
 .It Fl w Ar speed
 Set the sending speed in words per minute. If not specified the default
 speed of 20 WPM is used.
 .It Fl f Ar frequency
 Set the sidetone frequency to something other than the default 600 Hz.
+.It Fl d Ar device
+Similar to
+.Fl p ,
+but use the RTS line of
+.Ar device
+.Pq which must by a tty device
+in order to emit the morse code.
+.It Fl e
+echo each character before it is sent, used together with either
+.Fl p
+or
+.Fl d .
 .El
 .Pp
 The
 .Fl w
 and
 .Fl f
-flags only work in conjunction with the
+flags only work in conjunction with either the
 .Fl p
+or the
+.Fl d
 flag.
 .Pp
 Not all prosigns have corresponding characters. Use
@@ -110,6 +128,19 @@ and
 .Ql +
 for
 .Em AR .
+.Pp
+Using flag
+.Fl d Ar device
+it is possible to key an external device, like a sidetone generator with
+a headset for training purposes, or even your ham radio transceiver.  For
+the latter, simply connect an NPN transistor to the serial port
+.Ar device ,
+emitter connected to ground, base connected through a resistor
+(few kiloohms) to RTS, collector to the key line of your transceiver
+(assuming the transceiver has a positive key supply voltage and is keyed
+by grounding the key input line).  A capacitor (some nanofarads) between
+base and ground is advisable to keep stray RF away, and to supress the
+minor glitch that is generated during program startup.
 .Sh FILES
 .Bl -tag -width /dev/speaker -compact
 .It Pa /dev/speaker
@@ -131,10 +162,17 @@ Cyrillic characters.  In all other cases, they are being interpreted
 as belonging to the
 .Ql ISO_8859-1
 character set.
+.Sh SEE ALSO
+.Xr speaker 4
 .Sh HISTORY
 Sound support for
 .Nm morse
 added by Lyndon Nerenberg (VE7TCP/VE6BBM) <lyndon@orthanc.com>.
+.Pp
+Ability to key an external device added by
+.ie t J\(:org Wunsch
+.el Joerg Wunsch
+(DL8DTL).
 .Sh BUGS
 Does only understand a few European characters (namely German and
 French), but neither Asian ones, or the continental landline code.