Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book22/JamesOswald_CPC-abc2.abc"
pscmd="(jcabc2ps /Users/jc/w/tmp/Tune-8168-JamesOswald_CPC-abc2.abc -F fmt/pdf_70.fmt +s 0.70 +maxs 2000 )>/Users/jc/w/tmp/Tune-8168-JamesOswald_CPC-abc2.ps 2>>/Users/jc/w/tmp/Tune-8168-get.log" returned status 35584.
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8168-JamesOswald_CPC-abc2.ps) >>/Users/jc/w/tmp/Tune-8168-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book22/JamesOswald_CPC-abc2.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_8168.log 298381 Log file, useful mostly for debugging
Coll_81683.log 271685 Log file, useful mostly for debugging
Coll_81684.log 292760 Log file, useful mostly for debugging
Tune-8168-JamesOswald_CPC-abc2.abc 159 ABC music file with the extracted tune(s)
Tune-8168-JamesOswald_CPC-abc2.ps 0 PostScript
Tune-8168-JamesOswald_CPC-abc2.txt 159 Plain-text file with the extracted tune(s)
Tune-8168-get.log 8447 Log file, useful mostly for debugging
Tune-81683-24CountryDances_1809_Cahusac_FTM.abc 181 ABC music file with the extracted tune(s)
Tune-81683-24CountryDances_1809_Cahusac_FTM.ps 6 PostScript
Tune-81683-24CountryDances_1809_Cahusac_FTM.txt 181 Plain-text file with the extracted tune(s)
Tune-81683-get.log 4529 Log file, useful mostly for debugging
These files should be available for 24 hours.