Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1762/dim.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7116-dim.ps) >>/Users/jc/w/tmp/Tune-7116-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1762/dim.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_7116.log 282009 Log file, useful mostly for debugging
Coll_71161.log 315305 Log file, useful mostly for debugging
Coll_71162.log 459811 Log file, useful mostly for debugging
Coll_71163.log 464009 Log file, useful mostly for debugging
Coll_71165.log 287609 Log file, useful mostly for debugging
List71168.log 160 Log file, useful mostly for debugging
Tune-7116-dim.abc 140 ABC music file with the extracted tune(s)
Tune-7116-dim.ps 6 PostScript
Tune-7116-dim.txt 140 Plain-text file with the extracted tune(s)
Tune-7116-get.log 8350 Log file, useful mostly for debugging
These files should be available for 24 hours.