pscmd="(jcabc2ps /Users/jc/w/tmp/Tune-9677-JohnWalsh.abc -F fmt/pdf_70.fmt +s 0.70 +maxs 2000 )>/Users/jc/w/tmp/Tune-9677-JohnWalsh.ps 2>>/Users/jc/w/tmp/Tune-9677-get.log" returned status 256.
http://roaringjelly.org/~jc/music/book/JohnWalsh.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 ]
filesizedescription
Sess-96777.log 2947005 Log file, useful mostly for debugging
Tune-9677-JohnWalsh.abc 1114771 ABC music file with the extracted tune(s)
Tune-9677-JohnWalsh.ps 33898 PostScript
Tune-9677-JohnWalsh.txt 1114771 Plain-text file with the extracted tune(s)
Tune-9677-get.log 453791 Log file, useful mostly for debugging
Tune-96779-get.log 3881 Log file, useful mostly for debugging
These files should be available for 24 hours.