I've assembled a basic PDP-11/53ish machine from parts. The CPU is It has an RQDX3 and cable management board, and a Seagate ST-251 (40 MB MFM) drive. This is all installed in a BA213. So far, I haven't managed to get a load device working. I have an RX50, but it seems unwilling to work. I'm trying to format the disk. Jonathan Engdahl describes a trick to bootstrap XXDP utilities using vtserver: http://home.alltel.net/engdahl/xxdp.htm Vtserver does its magic, ODT-ing in the loader, and transferring the modified ZRQCH0 binary (from XXDP 2.5). At this point, the machine seems to hang: @p Opened xboot.dd read-write rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr EOF2 45Boot from vt(0,0,0) at 0177560 : vt(0,0,1) Opened ZRQCH0 read-write rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr EOF2 Boot: bootdev=06401 bootcsr=0177560 I have to cycle power to regain control. Help please. Has anyone else ever tried this? Thanks, De