This demo includes assembler source for the rotation demo. It can easily
manage 50fps with nearly full screen on a base 1200, and 25fps on full screen.
It may well do 50fps on a 4000, but I'm not sure.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                41579  133316  31.2% -lh5- 013a Jun  6  1994 RotatePicture
[generic]                 3366    8595  39.2% -lh5- 8917 Jun  6  1994 RotatePicture.s
[generic]                 4919    7968  61.7% -lh5- 23f2 Jun  3  1994 dump
[generic]                 1397    3176  44.0% -lh5- bf10 Jun  3  1994 dump.c
[generic]                  405     550  73.6% -lh5- 5031 Jun  6  1994 startup.bin
[generic]                  126     128  98.4% -lh5- 252f Dec 25  1993 GetControl
[generic]                 1719    4839  35.5% -lh5- 8657 Jun  3  1994 Chunky.s
[generic]                 1209    2164  55.9% -lh5- 42f5 Jun  6  1994 chunky.doc
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         8 files   54720  160736  34.0%            Jun  8  1994