AT&T 3B2/300 Technical Reference Manual page 256

- - - - - - - - - - - - - - - - - - - - - - - - - - - FUNCTIONAL DESCRIPTION
3B2 COMPUTER
CABINET
HARD
DISK
DRIVE 0
HARD
DISK
DRIVE 1
(NOTE 5)
FLOPPY
DISK
DRIVE
r---
----,
CONSOLE
CONTTY
RS-232C
PORTS
I
r-----------.J
SYSTEM BOARD
MISCELLANEOUS
LOGIC CIRCUITS,
ROM, TIMERS,
NVRAM, ETC.
MATH
ACCELERATION
UNIT
(OPTIONAL)
INTEGRAL
CONTROLLERS
DIRECT
MEMORY
ACCESS
MICROPROCESSOR
AND
MEMORY
MANAGEMENT
UNIT
CONTROLLER
DUAL PORT DYNAMIC
RAM CONTROLLER
r--------------------,
BACKPLANE
SLOT 12 SLOT 11
SLOT 10 SLOT 9
SLOT 8 SLOT 7
SLOT 6
SLOT 5
L-
(NOTE
4) (NOTE
4)
SLOT 4
SLOT 3
SLOT 2
SLOT 1
NOTE 2
L-----------------------------------.JL--------------------.J
.----.-0 __
0
NOTE3
~
r
RANDOM
[J [J
~
I ACCESS I
I MEMORY
RAM
O
RAM 1 I
I CARDS I
I I
I I
I I
r--------------------,
POWER SUPPLY ASSEMBLY
+SV, +12V, -12V
ON/STANDBY
SWITCH
RESET
SWITCH
POWER
SUPPLY
SET
FUSE AND
AC LINE FILTER
FAN
ASSEMBLY
L-----------------------------------.JL--------------------.J
NOTES:
I.
32-BIT ADDRESS BUS AND 32-BIT DATA BUS.
2: 24-BIT ADDRESS BUS AND 16-BIT DATA BUS.
3. 32-BIT DATA BUS PLUS BYTE PARITY.
4.
382/300 AND 310 COMPUTERS HAVE 4 SLOTS. 382/400 COMPUTER HAS 12 SLOTS.
5. HARD DISK DRIVE 1 IS MOUNTED IN THE 382 COMPUTER CABINET
ONLY FOR 382/400. FOR 382/300 and 310, DRIVE 1 IS MOUNTED IN AN AT&T/XM.
Figure 3-1: 3B2/300/310/400 Computer - High-Level
Functional Block Diagram
FUNCTIONAL DESCRIPTION 3-3