#define NBUF 15 /* size of buffer cache */
#define NINODE 100 /* number of in core inodes */
#define NFILE 100 /* number of in core file structures */
#define NMOUNT 5 /* number of mountable file systems */
#define NEXEC 3 /* number of simultaneous exec's */
#define MAXMEM (64*32) /* max core per process - first # is Kw */
#define SSIZE 20 /* initial stack size (*64 bytes) */
#define SINCR 20 /* increment of stack (*64 bytes) */
#define NOFILE 15 /* max open files per process */
#define CANBSIZ 256 /* max size of typewriter line */
#define CMAPSIZ 100 /* size of core allocation area */
#define SMAPSIZ 100 /* size of swap allocation area */
#define NCALL 20 /* max simultaneous time callouts */
#define NPROC 50 /* max number of processes */
#define NTEXT 40 /* max number of pure texts */
#define NCLIST 100 /* max total clist size */
#define HZ 60 /* Ticks/second of the clock */
#define SIGHUP 1 /* hangup */
#define SIGINT 2 /* interrupt (rubout) */
#define SIGQIT 3 /* quit (FS) */
#define SIGINS 4 /* illegal instruction */
#define SIGTRC 5 /* trace or breakpoint */
#define SIGIOT 6 /* iot */
#define SIGEMT 7 /* emt */
#define SIGFPT 8 /* floating exception */
#define SIGKIL 9 /* kill */
#define SIGBUS 10 /* bus error */
#define SIGSEG 11 /* segmentation violation */
#define SIGSYS 12 /* sys */
#define SIGPIPE 13 /* end of pipe */
#define USIZE 16 /* size of user block (*64) */
#define ROOTINO 1 /* i number of all roots */
#define DIRSIZ 14 /* max characters per directory */
* structure to access an integer
* Certain processor registers