AT&T 3B2/300 Technical Reference Manual page 260

- - - - - - - - - - - - - - - - - - - - - - - FUNCTIONAL DESCRIPTION
VERSION 3 COMPUTER
CABINET
FLOPPY
DISK
DRIVE
VCACHE
(OPTIONAL)
PBUS
(CARDS
OPTIONAL)
,--------------
----,
·-----.
: CONSOLE
~ ~
: , ------1
L __
N_O_T_E_l _ _
~
CONTTY
9 :
~---------------~
SYSTEM BOARD
MICROPROCESSOR,
MEMORY
MANAGEMENT
UNIT,AND
MISCELLANEOUS
LOGIC CIRCUITS,
ROM, TIMERS,
NVRAM, ETC.
INTEGRAL
CONTROLLERS
DIRECT
MEMORY
ACCESS
CONTROLLER
MATH DUAL PORT
ACCELERATION DYNAMIC RAM
UNIT CONTROLLER
L----------------------------------~
____.0L....---.
0
NOTE3
~
,- RANDOM - - - - - - - - - - - - - - - - - - - - - - - - ,
:
~~~J~y
I
RAM
O
I I
RAM 1
I :
I
CARDS
<NOTE 5) __ - - - - - - - - - - - - - - - - - - - - - - -
I
: I
RAM2
I I
RAM3
I :
L-----------------------------------~
NOTES:
I.
UNBUFFERED 32-BIT ADDRESS BUS AND 32-BIT DATA BUS.
2. BUFFERED 24-BIT ADDRESS BUS AND 16-BIT DATA BUS.
3. 32-BIT DATA BUS PLUS BYTE PARITY.
,---------------------,
ENHANCED 1/0 BUS
SLOT 12 SLOT 11
SLOT 10 SLOT 9
SLOT 8 SLOT 7
- _ Jl'J!JT.I.~ - -
SLOT6 SLOT 5
SLOT4 SLOT 3
SLOT 2 SLOT 1
(NOTE 6)
--------~
NOTE
2
BUBUS
(CARDS
OPTIONAL)
,- POWER SUPPLY ASSEMBLY ,
+sv, +12v, -12v
POWER
SUPPLY
SET
FAN
ASSEMBLY
4. 3B2/500 COMPUTER HAS 7 SLOTS. OTHER VERSION 3 COMPUTERS HAVE 12 SLOTS.
5. 3B2/500 COMPUTER HAS 2 MEMORY SLOTS. OTHER VERSION 3 COMPUTERS HA VE 4 SLOTS.
6. SLOT 1 IS NORMALLY OCCUPIED BY THE SCSI HOST ADAPTER CONNECTED TO THE
INTERNAL HARD DISK DRIVE(S) AND CARTRIDGE TAPE DRIVE (IF EQUIPPED).
Figure 3-2: Version 3 Computer - High-Level
Functional Block Diagram
FUNCTIONAL DESCRIPTION 3-7