pscmd="(jcabc2ps /Users/jc/w/tmp/Tune-9770-CR-abc1.abc -F fmt/pdf_55.fmt +s 0.55 +maxs 2000 )>/Users/jc/w/tmp/Tune-9770-CR-abc1.ps 2>>/Users/jc/w/tmp/Tune-9770-get.log" returned status 34304.
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9770-CR-abc1.ps) >>/Users/jc/w/tmp/Tune-9770-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR/CR-abc1.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_97700.log 250611 Log file, useful mostly for debugging
Coll_97703.log 1068320 Log file, useful mostly for debugging
Coll_97705.log 1273451 Log file, useful mostly for debugging
Coll_97708.log 2730956 Log file, useful mostly for debugging
Tune-9770-CR-abc1.abc 389817 ABC music file with the extracted tune(s)
Tune-9770-CR-abc1.ps 3037211 PostScript
Tune-9770-CR-abc1.txt 389817 Plain-text file with the extracted tune(s)
Tune-9770-get.log 248953 Log file, useful mostly for debugging
Tune-97707-get.log 3132 Log file, useful mostly for debugging
Tune-97708-get.log 1346 Log file, useful mostly for debugging
These files should be available for 24 hours.