cat(4) cat: phototypesetter interface. dc(4) dc: DC-11 communications interface. dh(4) dh: DH-11 communications multiplexer. dn(4) dn: DN-11 ACU interface. dp(4) dp: DP-11 201 data-phone interface. dz(4) dz: DZ-11 communications multiplexer. hp(4) hp: RH-11/RP04, RP05, RP06, RM03 moving-head disk. hs(4) hs: RH11/RS03-RS04 fixed-head disk file. ht(4) ht: RH-11/TE-16 magtape interface. kl(4) kl: KL-11 or DL-11 asynchronous interface. lp(4) lp: line printer. mem(4) mem, kmem: main memory. null(4) null: data sink. pc(4) pc: PC-11 paper tape reader/punch. rf(4) rf: RF11/RS11 fixed-head disk file. rk(4) rk: RK-11/RK03 or RK05 disk. rp(4) rp: RP-11/RP03 moving-head disk. tc(4) tc: TC-11/TU56 DECtape. tm(4) tm: TM-11/TU-10 magtape interface. tty(4) tty: general terminal interface. vp(4) vp: Versatec printer-plotter.