Add a few comments about recent changes in demos

diff --git a/demo/README b/demo/README
index e9846aab8cfeb2964fa2b085cf92fd70476ecc28..4e9c164dc906db71ecf77183bc7bd9a06ce947c7 100644 (file)
--- a/demo/README
+++ b/demo/README
@@ -17,6 +17,7 @@ other demos.
 The perl subdirectory contains a few examples for the perl wrapper.
 
 
+
 DEMO PROGRAMS:
 
 ao_waveform:
@@ -31,7 +32,9 @@ common:
 cmd: 
        An example for directly using Comedi commands.  Comedi commands
        are used for asynchronous acquisition, with the timing controlled
-       by on-board timers or external events.
+       by on-board timers or external events.  If this demo doesn't work
+       with your hardware, read the comments in the source.  Hint: data
+       is written to stdout, comments to stderr.
  
 dio:
        Requirements:  A board with a digital I/O subdevice.  Not just
@@ -68,7 +71,8 @@ ledclock:
 mmap:
        This example shows how to map the internal Comedi buffer
        and directly access samples instead of using read() and
-       write().
+       write().  This is very similar to cmd.c, so look there for
+       comments on most of the code.
 
 outp <value>:
        Write one <value> to one channel of one subdevice.  Requires