pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-20448-1765_Thompson.ps) >>/Users/jc/w/tmp/Tune-20448-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/dfty/1765_Thompson.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_20448.log 263256 Log file, useful mostly for debugging
Tune-20448-1765_Thompson.abc 14236 ABC music file with the extracted tune(s)
Tune-20448-1765_Thompson.ps 95443 PostScript
Tune-20448-1765_Thompson.txt 14236 Plain-text file with the extracted tune(s)
Tune-20448-get.log 13030 Log file, useful mostly for debugging
These files should be available for 24 hours.