pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-12985-ofpc_volume4.ps) >>/Users/jc/w/tmp/Tune-12985-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/OFPC/ofpc_volume4.txt

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Tune-12985-get.log 4384 Log file, useful mostly for debugging
Tune-12985-ofpc_volume4.abc 349 ABC music file with the extracted tune(s)
Tune-12985-ofpc_volume4.ps 37001 PostScript
Tune-12985-ofpc_volume4.txt 349 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.