pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8285-1792_Thompson_24.ps) >>/Users/jc/w/tmp/Tune-8285-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1792_Thompson_24.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_82855.log 348545 Log file, useful mostly for debugging
Form_82854.log 975 Log file, useful mostly for debugging
Tune-8285-1792_Thompson_24.abc 11842 ABC music file with the extracted tune(s)
Tune-8285-1792_Thompson_24.ps 141478 PostScript
Tune-8285-1792_Thompson_24.txt 11842 Plain-text file with the extracted tune(s)
Tune-8285-get.log 21338 Log file, useful mostly for debugging
Tune-82851-EliasHowe_MusiciansCompanionP3-1844-V2.abc 176 ABC music file with the extracted tune(s)
Tune-82851-EliasHowe_MusiciansCompanionP3-1844-V2.pdf 2217 Portable Data Format
Tune-82851-EliasHowe_MusiciansCompanionP3-1844-V2.ps 6 PostScript
Tune-82851-EliasHowe_MusiciansCompanionP3-1844-V2.txt 176 Plain-text file with the extracted tune(s)
Tune-82851-get.log 11356 Log file, useful mostly for debugging
Tune-82852-24FavouriteDances_1779_Straight.abc 168 ABC music file with the extracted tune(s)
Tune-82852-24FavouriteDances_1779_Straight.ps 6 PostScript
Tune-82852-24FavouriteDances_1779_Straight.txt 168 Plain-text file with the extracted tune(s)
Tune-82852-get.log 4549 Log file, useful mostly for debugging
Tune-82854-get.log 3533 Log file, useful mostly for debugging
Tune-82855-get.log 4306 Log file, useful mostly for debugging
These files should be available for 24 hours.