pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-29390-makamu18.ps) >>/Users/jc/w/tmp/Tune-29390-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/ifdo.ca/~seymour/runabc/makams/makamu18.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-29390-get.log 10084 Log file, useful mostly for debugging
Tune-29390-makamu18.abc 3038 ABC music file with the extracted tune(s)
Tune-29390-makamu18.ps 61717 PostScript
Tune-29390-makamu18.txt 3038 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.