cons.h

著名的AT&T UNIX v6 源码

/*
  VAX console interface registers
 */

#define RXCS_IE 0x40	/* receiver interrupt enable */
#define RXCS_DONE 0x80	/* receiver done */
#define RXDB_DATA 0xff	/* received character */
#define RXDB_ID 0xf00	/* channel id */
#define RXDB_ERR 0x80000000	/* receiver error */

#define TXCS_IE 0x40	/* transmitter interrupt enable */
#define TXCS_RDY 0x80	/* transmitter ready for next char */
#define TXDB_DATA 0xff	/* transmitter byte */
#define TXDB_ID 0xf00	/* channel id */