printcap sd: Can't use Ram Disk

Can’t use ram disk for spool directory - specified in printcap file

Attempting to use the ram disk for the spool directory specified in the
printcap file.

  1. Create a directory /ram/spool/printers/josa_ps

  2. printcap entry
    1|josa_ps|Postscript printer in lab josa

  1. lpd -l &

  2. spooler -d /dev/null -c /etc/josa_ps.cfg -s /ram/spool/printers

  3. Print a file to josa-ps printer

  4. The spooler shows the following error after completing the Spawn
    link: Not supported

If I modify the printcap file to use sd=/var/spool/printers/josa_ps then
it works fine.
Where /var is part of the flash filesystem.