26 Oct
2012
26 Oct
'12
10:20 p.m.
On 10/26/2012 10:07 PM, Jon Elson wrote:
It actually runs a simple memory test during the
power-up diagnostics, I
think maybe
it was 7...8 that is the memory diags. They are the ones that takes the
longest to run,
the others complete mostly in less than a second.
They are 6 and 7; 6 is the addressing test and 7 is the data test.
You have to know the layout of your backplane to know
where grant contnuity
cards are required. Old uVax II backplanes have the memory bus on the CD
rows for 2 or 4 slots, and need no grant continuity there, but the AB
rows are Q-bus, and would
need either double-wide Q-bus boards there or grant continuity. Later
backplanes
didn't have the Q-bus start until after the first couple slots. So, you
really need to know what
the backplane layout is.
The BA23 backplane is Q/CD for slots 1, 2, and 3, the rest are Q/Q
serpentine. The BA123 backplane is Q/CD for slots 1 through 4, the rest
are Q/Q serpentine.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA