SPX_COMMAND
SPX_REG(SPX_COMMAND) = 0x84884648 | direction; /* 0x848c4648? */
SPXg_REG(SPX_COMMAND) = 0x84884648 | direction; spxg_delay();
SPX_REG(SPX_COMMAND) = 0x84884608;
SPXg_REG(SPX_COMMAND) = 0x84884608; spxg_delay();
SPX_REG(SPX_COMMAND) = 0x84884648;
SPXg_REG(SPX_COMMAND) = 0x84884648;