pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-28231-CPCvol1bk03-abc2.ps) >>/Users/jc/w/tmp/Tune-28231-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JamesOswald/CPC/CPCvol1/Book03/CPCvol1bk03-abc2.abc

Error exit status 256; here are some files to check:

[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Coll_28231.log 322379 Log file, useful mostly for debugging
Tune-28231-CPCvol1bk03-abc2.abc 671 ABC music file with the extracted tune(s)
Tune-28231-CPCvol1bk03-abc2.ps 38059 PostScript
Tune-28231-CPCvol1bk03-abc2.txt 671 Plain-text file with the extracted tune(s)
Tune-28231-get.log 4566 Log file, useful mostly for debugging
These files should be available for 24 hours.