Usage:-
  ppm2bbc [<opts>]<ppm-file> [ [<opts>]<ppm-file>... ]
<opts> are -0,-1,-2,-4,-5 to set BBC MODE. -2 is default.
-a2,-a0 for aspect-correction, -hX1,-hsXa2 for halftoning:-
	X=0 for no halftoning,
	X=1 for fine halftoning (default),
	X=2 for coarse halftoning,
	X=3 for spiral halftoning,
	X=4 for diagonal halftoning.
	's' between the -h and the X value staggers the RGB values.
	Staggering often works well for MODE 2, but not for 2-colour modes.

Leave no spaces between the options and the filename.
eg. ppm2bbc -a2house.ppm -hs4a0picture.ppm

Tip: Use GNU bash if you want to use wildcards with this program...

PERMISSION  UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP     NAME
---------- ----------- ------- ------- ------ ---------- ------------ ----------
[generic]                 3834    8296  46.2% -lh5- 5680 Aug 13  1997 ppm2bbc/ppm2bbc.exe
[generic]                 2132    5138  41.5% -lh5- 3f41 Aug 14  1997 ppm2bbc/readme.txt
[generic]                10777   21408  50.3% -lh5- 3042 Jun 19 15:28 ppm2bbc/ppm2bbc.68k
[generic]                 3086    8556  36.1% -lh5- ea11 Jun 19 15:27 ppm2bbc/ppm2bbc.c
[generic]                 3112    8973  34.7% -lh5- 3ecc Aug 13  1997 ppm2bbc/ppm2bbc.c.bak
[generic]                 8399   18444  45.5% -lh5- d042 Jun 19 15:39 ppm2bbc/ppm2bbc
---------- ----------- ------- ------- ------ ---------- ------------ ----------
 Total         6 files   31340   70815  44.3%            Jun 20 03:21