pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-26383-CPCvol2-abc2.ps) >>/Users/jc/w/tmp/Tune-26383-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/JamesOswald/CPC/CPCvol2-abc2.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.65 512x512 PNG]
filesizedescription
Tune-26383-CPCvol2-abc2.abc 222645 ABC music file with the extracted tune(s)
Tune-26383-CPCvol2-abc2.ps 3095064 PostScript
Tune-26383-CPCvol2-abc2.txt 222645 Plain-text file with the extracted tune(s)
Tune-26383-get.log 203127 Log file, useful mostly for debugging
These files should be available for 24 hours.