27 Mar
2014
27 Mar
'14
8:42 a.m.
Slot 1 KA630-A CPU M7606AF
Slot 2 8M RAM M7609-AM
Slot 3 8M RAM M7609-AP
Slot 4 CMD SCSI MSCP encapsulating (top half) empty bottom
Slot 5 M7516-YM (ethernet, top) M7546 for TK-50 (bottom)
Slot 6 VCB02
Slot 7 VCB02 Memory
Slot 8 VCB02 Memory
What chassis? BA23? BA123? Something else?
BA123 has more slots in general plus
more ABCD slots for quad wide
ram.
BA23 only has two slots after the cpu for quad wide ram (ABCD)
though that is a memory test for me. However in all cases if the
dual width slot is not a CD slot then any AB slot is either occupied or
must have a grant card filling it.
AB slots are Qbus data/address wired where CD are "other".
In particular - and this is based on fuzzy memory;
I'm sure one of the
people who really knows this stuff will correct me if I'm wrong -
having devices (like Ethernet) that do interrupts after an empty half
won't work unless it's a C/D slot, and I think some but not all of the
possible chasses (chassises?) have C/D on slot 4.
OK, Remove VCB for later once an OS is operating.
I need the book (available on line) to know if the first three slots or
is it four
are ABCD, I'll assume first three (CPU and ram) making the next series of
slots ABAB. Below the ram ABCD slots its serpentine and failure to
follow that
breaks the interrupt chain. Note the only exception that must be last
is the
RQDX1 (didn't pass itnerrupts) RqDX2 and RQdx3 did and can be anywhere
in the grant chain.
The ethernet card (all versions) did pass interrupts but card order is a
matter of
performance. Same for serial cards.
Makes that then...
CPU
RAM
RAM
CMD|ETH
next-card|nextcard
Allison