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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: