Ethan Dicks wrote:
--- chu(a)verizon.net wrote:
I runs the self test loop correctly.
However, when I try to boot
either DU0 or MU0 the machine gets
hung up.
Do you have a complete grant chain? Gaps in the backplane
will also cause that behavior. You need all the cards "next"
to each other (according to the routing of your grant signals
which differs, depending on which backplane you have).
If you have a BA23, your grant goes something like this...
0 A-B
V
1 A-B
v
2 A-B
v
3 A-B -> C-D
v
4 A-B <- C-D
v
5 A-B -> C-D
v
6 A-B <- C-D
...etc., down to slot 9. Other backplanes are different (some all
sinusoidal, some straight down).
I think there are *3* straight down slots before the first *serpentine*
slot in the BA23. :-)
-ethan
-chuck