pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5228-1780_Skillern.ps) >>/Users/jc/w/tmp/Tune-5228-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1780_Skillern.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_5228.log 454210 Log file, useful mostly for debugging
Coll_52280.log 461209 Log file, useful mostly for debugging
Coll_52285.log 455610 Log file, useful mostly for debugging
Form_52284.log 1943 Log file, useful mostly for debugging
Tune-5228-1780_Skillern.abc 18149 ABC music file with the extracted tune(s)
Tune-5228-1780_Skillern.ps 117815 PostScript
Tune-5228-1780_Skillern.txt 18149 Plain-text file with the extracted tune(s)
Tune-5228-get.log 17107 Log file, useful mostly for debugging
These files should be available for 24 hours.