pscmd="(jcabc2ps /Users/jc/w/tmp/Tune-8298-CaledonianMusicalRepository.abc -F fmt/pdf_70.fmt +s 0.70 +maxs 2000 )>/Users/jc/w/tmp/Tune-8298-CaledonianMusicalRepository.ps 2>>/Users/jc/w/tmp/Tune-8298-get.log" returned status 256.
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8298-CaledonianMusicalRepository.ps) >>/Users/jc/w/tmp/Tune-8298-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/CaledonianMusicalRepository.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_82980.log 665085 Log file, useful mostly for debugging
Coll_82987.log 156994 Log file, useful mostly for debugging
Coll_82989.log 304000 Log file, useful mostly for debugging
Tune-8298-CaledonianMusicalRepository.abc 454115 ABC music file with the extracted tune(s)
Tune-8298-CaledonianMusicalRepository.ps 30410 PostScript
Tune-8298-CaledonianMusicalRepository.txt 454115 Plain-text file with the extracted tune(s)
Tune-8298-get.log 161634 Log file, useful mostly for debugging
Tune-82983-get.log 4702 Log file, useful mostly for debugging
These files should be available for 24 hours.