> > You have no memory, and probably no devices to complete the > Unibus. So, it is quite likely showing the Unibus is in a > jammed state. At the least, you need a Unibus terminator, > and any bus grant cards between the CPU and the terminator > (you'd have to check the manual to see how the Unibus is wired.)
The specific issue of an open grant chain locking the Unibus is a quirk of the M9302 terminator (which asserts SACK under such conditions). This is unlikely to be a problem on an 11/10. But you do need some kind of termination/pullups on the Unibus. At least fit the CPU-end terminator (M930 in the right slot near the CPU boards) if you haven't done so already. -tony
