; display.h

; interface description for generic display object methods
;	in all cases, 	R3 = object pointer on entry to method
;	in all cases,   first field of object points to method table

; all details of object structure depend on the subclass of the object

; method table fields

PUTC	=	0	; put one character to display
;			R4 = character to put

AT	=	4	; set display position
;			R4 = X coordinate
;			R5 = Y coordinate

SIZE	=	8	; return display dimensions
;			R3 = width
;			R4 = height