[This is the console log from booting xxdp-rqdx-20220616.t58 on SIMH V4.0.0 (Beta release date 07-SEP-2017) on a PDP-11/23+ from device TDC0 (DDO:)] BOOTING UP XXDP-XM EXTENDED MONITOR XXDP-XM EXTENDED MONITOR - XXDP V2.5 REVISION: F0 BOOTED FROM DD0 124KW OF MEMORY NON-UNIBUS SYSTEM RESTART ADDRESS: 152000 TYPE "H" FOR HELP ! .DIR DD0: ENTRY# FILNAM.EXT DATE LENGTH START VERSION 1 XXDPSM.SYS 1-MAR-89 29 000050 E.0 2 DRSSM .SYS 1-MAR-89 24 000105 G.2 3 DATE .SYS 1-MAR-89 2 000135 B.0 4 DIR .SYS 1-MAR-89 7 000137 D.0 5 HELP .TXT 1-MAR-89 29 000146 6 DU .SYS 1-MAR-89 4 000203 E.0 7 DD .SYS 1-MAR-89 3 000207 D.0 8 ZRQCH0.BIN 1-MAR-89 72 000212 9 ZRQFC0.BIC 1-MAR-89 34 000322 10 ZRQGC0.BIN 1-MAR-89 74 000364 11 XXDPXM.SYS 1-MAR-89 39 000476 F.0 12 DRSXM .SYS 1-MAR-89 48 000545 C.0 13 DUSZ .SYS 1-MAR-89 2 000625 C.0 FREE BLOCKS: 104 .