pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-10688-941_Harriot.ps) >>/Users/jc/w/tmp/Tune-10688-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1780/Thompson/941_Harriot.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_10688.log 280115 Log file, useful mostly for debugging
Tune-10688-941_Harriot.abc 861 ABC music file with the extracted tune(s)
Tune-10688-941_Harriot.ps 33579 PostScript
Tune-10688-941_Harriot.txt 861 Plain-text file with the extracted tune(s)
Tune-10688-get.log 4498 Log file, useful mostly for debugging
These files should be available for 24 hours.