pscmd="(jcabc2ps /Users/jc/w/tmp/Tune-5473-SkillernChalloner_PCD2.abc -F fmt/pdf_70.fmt +s 0.70 +maxs 2000 )>/Users/jc/w/tmp/Tune-5473-SkillernChalloner_PCD2.ps 2>>/Users/jc/w/tmp/Tune-5473-get.log" returned status 35584.
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5473-SkillernChalloner_PCD2.ps) >>/Users/jc/w/tmp/Tune-5473-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/SkillernChalloner_PCD2.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_54733.log 618720 Log file, useful mostly for debugging
Coll_54739.log 475410 Log file, useful mostly for debugging
Tune-5473-SkillernChalloner_PCD2.abc 41605 ABC music file with the extracted tune(s)
Tune-5473-SkillernChalloner_PCD2.ps 30216 PostScript
Tune-5473-SkillernChalloner_PCD2.txt 41605 Plain-text file with the extracted tune(s)
Tune-5473-get.log 23257 Log file, useful mostly for debugging
Tune-54731-get.log 5710 Log file, useful mostly for debugging
Tune-54737-Bob_McQuillen_book09.abc 95792 ABC music file with the extracted tune(s)
Tune-54737-Bob_McQuillen_book09.ps 628358 PostScript
Tune-54737-Bob_McQuillen_book09.txt 95792 Plain-text file with the extracted tune(s)
Tune-54737-get.log 79853 Log file, useful mostly for debugging
Tune-54738-get.log 4313 Log file, useful mostly for debugging
These files should be available for 24 hours.