pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-43781-MACDOS.ps) >>/Users/jc/w/tmp/Tune-43781-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/website.lineone.net/~roypmin/MACDOS.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
Tune-43781-MACDOS.abc 574 ABC music file with the extracted tune(s)
Tune-43781-MACDOS.ps 37780 PostScript
Tune-43781-MACDOS.txt 574 Plain-text file with the extracted tune(s)
Tune-43781-get.log 4895 Log file, useful mostly for debugging
These files should be available for 24 hours.