extern int wn_dmaflg                   /* dma flag */
extern char wn_sbit                    /* retrace test bit 8 slow, 1 fast */
extern int wn_blank                    /* vidon & vidoff control flag */
extern int wns_bchars[]                /* box chars */
extern unsigned int wns_mtflg          /* monitor type flag */
extern int wns_cflag                   /* close in progress flag */

extern struct SREGS wns_srp            /* for segread */

extern unsigned wni_seg[]              /* for wns_push/pop */
extern unsigned wni_off[]              /* ditto */
extern unsigned wni_ptr[]              /* ditto */

#define BCUL  wns_bchars[0]             /* some shorthand for later */
#define BCUR  wns_bchars[1]
#define BCTB  wns_bchars[2]
#define BCSD  wns_bchars[3]
#define BCLL  wns_bchars[4]
#define BCLR  wns_bchars[5]