Functions:
/* Reset mouse driver and return current status */
extern int m_reset(void )

/* Increment cursor flag and display cursor */
extern int m_showcur(void )

/* Decrement cursor flag and hide cursor */
extern int m_hidecur(void )

/* Read cursor position and status */
extern int m_readloc(void )

/* Set cursor position */
extern int m_setloc(int x,int y)

/* Get mouse button press information */
extern int m_keyprs(int button)

/* Get mouse button release information */
extern int m_keyrls(int button)

/* Set horizontal minimum and maximum */
extern int m_setxlim(int xmin,int xmax)

/* Set vertical minimum and maximum */
extern int m_setylim(int ymin,int ymax)

/* Define graphics cursor */
extern int m_defgcur(int hot_x,int hot_y,int cur_shape)

/* Define text cursor */
extern int m_deftcur(int cur_type,int scr_msk,int cur_msk)

/* Read mouse motion counters */
extern int m_mickeys(void )

/* Set user-defined subroutine call mask */
extern int m_inpmsk(int call_msk,int offset)

/* Turn light-pen emulation on */
extern int m_penon(void )

/* Turn light-pen emulation off */
extern int m_penoff(void )

/* Set horizontal and vertical motion sensitivity */
extern int m_setasp(int h_ratio,int v_ratio)