Int FF  - Pc/forth - Graphics Api                                          [V]

   BX = function number
       0001h function REDRAW
       0002h function !PEL
       0003h function @PEL
       0004h function LINE
       0005h function ARC
       0006h function @BLOCK
       0007h function !BLOCK
       0008h function FLOOD
   DS:SI -> FORTH program counter
   SS:BP -> FORTH parameter stack
   SS:SP -> FORTH return stack
   details of parameters not available

Return:    AX,BX,CX,DX,ES,DI may be destroyed

Note:  these functions all display an error message if the graphics routines
     are not resident