737NG - Dual FMC failure, no longer PRNAV/BRNAV. RVSM Maintained. A/P will not disengage, however LNAV and VNAV cease to function obviously. ALT HOLD Maintains altitude, HDG SEL for radar vectors and VOR/LOC for pretty much everything else. Set up ref and N1 limit manually with the selectors situated above the upper DU and refer to the QRH PI for the figures. Had it in the sim 8 months ago.