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cc65/libsrc/cbm510/mouseref.s

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;
; Pointer for library references by device drivers.
;
; 2013-07-25, Greg King
;
.export mouse_libref, _pen_adjuster
.data
mouse_libref: ; generic label for mouse-kernel
; A program optionally can set this pointer to a function that gives
; a calibration value to a driver. If this pointer isn't NULL,
; then a driver that wants a value can call that function.
;
; The function might read a value from a file; or, it might ask the user
; to help calibrate the driver.
;
; void __fastcall__ (*pen_adjuster)(unsigned char *) = NULL;
;
_pen_adjuster:
.addr $0000