The rear view of the 3B2/600 (and higher) systems shows 25 slots where
various kinds of cards, including the CPU. This chart shows each slot
with its label, and we'll note restrictions on the cards after.
| I/O 12 |
I/O 11 |
| I/O 10 |
I/O 9 |
| I/O 8 |
I/O 7 |
| I/O 6 |
I/O 5 |
| I/O 4 |
I/O 3 |
| I/O 2 |
I/O 1 |
CPU
|
| VCACHE/PBus |
MEM 0 |
| POWER ONLY |
MEM 1 |
| BUB 03 |
MEM 2 |
| BUB 02 |
MEM 4 |
| BUB 01 |
POWER ONLY |
| BUB 00 |
POWER ONLY |
Random notes on these cards:
- I/O cards must fill up from the low numbers on up: no gaps. So
I/O1 must be first, then I/O2, etc.
- Memory fills in MEM0, MEM1, MEM2, MEM3 order.
- The 16 megabyte card CM523D won't work with the CM518A
system board (3B2/500 or 3B2/600).
- The VCACHE/PBus slot depends on the system board and the backplane.
Only the CM519A backplane supplies VCACHE, and even so only the
CM518A system board will actually use it: the CM518B has
onboard PCache. For the CM518B backplane (for 3B2/1000 M80) and
the CM518C system board, this slot is "PBus", and it can take
a PE (Processor Element) card.
- The "BUB" slots are "Buffered Microbus", and their support depends
on the system board. CM518A (3b2/600) supports just one, while the higher
boards support more. MBP (multiprocessor) cards go in BUB slots.
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