pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8020-dim.ps) >>/Users/jc/w/tmp/Tune-8020-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP2/dim.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-8020-dim.abc 221 ABC music file with the extracted tune(s)
Tune-8020-dim.ps 6 PostScript
Tune-8020-dim.txt 221 Plain-text file with the extracted tune(s)
Tune-8020-get.log 3917 Log file, useful mostly for debugging
Tune-80202-get.log 4998 Log file, useful mostly for debugging
Tune-80204-get.log 5360 Log file, useful mostly for debugging
Tune-80205-SkillernChalloner_PCD1.abc 158 ABC music file with the extracted tune(s)
Tune-80205-SkillernChalloner_PCD1.ps 6 PostScript
Tune-80205-SkillernChalloner_PCD1.txt 158 Plain-text file with the extracted tune(s)
Tune-80205-get.log 4239 Log file, useful mostly for debugging
Tune-80206-get.log 4131 Log file, useful mostly for debugging
Tune-80208-get.log 3310 Log file, useful mostly for debugging
Tune-80209-get.log 4212 Log file, useful mostly for debugging
These files should be available for 24 hours.