pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7433-celticc.ps) >>/Users/jc/w/tmp/Tune-7433-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/homepages.ihug.co.nz/celticc.abc:/%33:BONNIEDOON.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_74331.log 259149 Log file, useful mostly for debugging
Coll_74338.log 256329 Log file, useful mostly for debugging
Form_7433.log 869 Log file, useful mostly for debugging
Form_74335.log 1730 Log file, useful mostly for debugging
Tune-7433-celticc.abc 403 ABC music file with the extracted tune(s)
Tune-7433-celticc.ps 35479 PostScript
Tune-7433-celticc.txt 403 Plain-text file with the extracted tune(s)
Tune-7433-get.log 11007 Log file, useful mostly for debugging
Tune-74331-get.log 1825 Log file, useful mostly for debugging
Tune-74334-get.log 7178 Log file, useful mostly for debugging
Tune-74337-get.log 4588 Log file, useful mostly for debugging
Tune-74339-CSRCD1.abc 768 ABC music file with the extracted tune(s)
Tune-74339-CSRCD1.txt 768 Plain-text file with the extracted tune(s)
Tune-74339-get.log 3095 Log file, useful mostly for debugging
These files should be available for 24 hours.