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1010/ap

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see also for radio code from ap0201 devices and: 15:39 (tech_notes#101)

http://www.svn.net/mycal/digital/encode.htm

data radio work prompted by latest PF updates. 15:04 (tech_notes#100)

Frequency Shift keying (FSK) as important. Related:

RTTY decoder
multimon 
AX25msxtape
fskmodem.c in Asterisk source code
soundmodem drivers in kernel and soundmodem package
discussion of soundoops and speaker twiddling on kernel mailing list

devdisplay tool 14:58 (software#4)

use:

cat /dev/dsp | ./devdisplay [width] [height]
http://1010.co.uk/devdisplay.c

gcc -o devdisplay devdisplay.c -lSDL