Toggling in PDP-11 Bootstraps...

Does anyone have any practical advice concerning this, something that might save me a little time/frustration? I'm playing around with some parts to try to learn more about how the system works, and here's what I've got: 22bit qbus backplane 11/73 cpu 1 meg ram various device interface cards (Dilog SQ706A, RQDX3, Emulex TC03, RXV21 clone) I'd like to be able to set up the simplest system possible and try to toggle in a bootstrap. I've played with the ones on metalab (RX01, MSCP) without much real success so far. Trying to boot from the RX01's using the bootstrap code on metalab results in the drive access light coming on, but nothing else happening. Sending a break stops at 1044 every time, the contents of that register is 1776. Trying to boot from the Dilog scsi device #0 (should be DU0, right?) just hangs (again using the MSCP bootstrap on metalab). The MSCP bootstrap is well-commented, so I can see what's going on there...a little hint or push may be all I need to be able to modify it to work for me. The RX01 bootstrap is not commented at all, unfortunately. I know the RXV21 clone is working OK, since I can boot from it with the bootstrap roms on my multifunction card... Thanks, Aaron