pz_device
struct pz_device mem_cons; /* description of console device */
struct pz_device mem_boot; /* description of boot device */
struct pz_device mem_kbd; /* description of keyboard device */
struct pz_device ctdev;
struct pz_device *pz_dev; /* device descriptor */
extern struct pz_device ctdev; /* cartridge tape (boot) device path */
int iodc_rw(char *, u_int, u_int, int func, struct pz_device *);
sizeof(struct pz_device));
struct pz_device;
struct pz_device *pdc_findev(int, int);
struct pz_device *pzdev = dp->pz_dev;
struct pz_device *
static struct pz_device pz;