Category: video

INT FF - PC/FORTH - GRAPHICS API

	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