x_mode
x_mode(true);
x_mode(false);
x_mode(false);
x_mode(true);
bool x_mode(bool onoff);
bool savmode = x_mode(false);
(void)x_mode(savmode);
x_mode(false);
x_mode(false);
x_mode equ $00 round to extended
x_mode equ $00 round to extended