16 Apr
2011
16 Apr
'11
10:34 a.m.
Thanks for the suggestions so far. I tried a few things with the =
following to report:
I verified the copy of RT-11 on RX-01 floppy. It boots fine on the LSI-11 =
system it was built on, tried "BOOT RT11SJ" as well as with the
"/FOREIGN" =
option and it ran fine on that system (which has an M7946 controller). =
The drive is configured for RX-01 mode only (since these are the only =
controllers I have in both Q-Bus and Unibus flavour).
Now, put that same drive on the 11/34 CPU with an M7846 card. Checked the =
CPU carefully: NPG jumpers are all intact on the backplane (CA1-CA2) and =
all unused slot D's have a grant continuity card. Just to ensure it works =
I reconfigured the console for 9600 baud (originally 300) and ran a simple =
"echo" program loaded at 001000 which runs fine (so it can store programs =
in memory and the execute them). The system has loads of memory - three =
cards with 16K, 48KW, and 96kW on them - so I did a quick check at =
locations 100000 and 700000 and memory is certainly there.
Some random thoughts
What devices do you have in the 11/34 system? An RX11, obviously. A
DL11-something (but what?) for the console port. Anything else?
Obviously the console and the RX11 must be at the right I/O addresses for
the system to get as far as it has. What about the interrupt vector
settings? Are those correct. Could it be falling over when it enables
interrupts on some device, the interurpt comes along and the vector is
not what's expected so it goes to thw wrong routine.
You have an M9301 at the CPU end of the bus. What, if any, terminator do
you have at the other end? Unibus (unlike Q-bus, normally) is terminated
at both ends.
Could it be a bad memory location? RT11SJ doesn't need much RAM to boot,
so perhaps you could try yor memory boards one at a time, each one set to
start at location 0, and see if that helps.
-tony