pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-33421-Black_Jack_6,7.ps) >>/Users/jc/w/tmp/Tune-33421-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JohnWalsh/Black_Jack_6,7.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Form_33421.log 821 Log file, useful mostly for debugging
Tune-33421-Black_Jack_6,7.abc 2962 ABC music file with the extracted tune(s)
Tune-33421-Black_Jack_6,7.ps 35454 PostScript
Tune-33421-Black_Jack_6,7.txt 2962 Plain-text file with the extracted tune(s)
Tune-33421-get.log 4480 Log file, useful mostly for debugging
These files should be available for 24 hours.