pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-93633-CR4-abc1.ps) >>/Users/jc/w/tmp/Tune-93633-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR/CR4-abc1.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_93633.log 1324551 Log file, useful mostly for debugging
Tune-93633-CR4-abc1.abc 93755 ABC music file with the extracted tune(s)
Tune-93633-CR4-abc1.ps 933372 PostScript
Tune-93633-CR4-abc1.txt 93755 Plain-text file with the extracted tune(s)
Tune-93633-get.log 53526 Log file, useful mostly for debugging
These files should be available for 24 hours.