AT&T 3B2/300 Technical Reference Manual page 257

FUNCTIONAL D E S C R I P T I O N - - - - - - - - - - - - - - - - - - - - - - -
382 COMPUTER
CABINET
HARD
DISK
DRIVE 0
HARD
DISK
DRIVE 1
(NOTE 5)
FLOPPY
DISK
DRIVE
r---
------- ----,
CONSOLE
CONTTY
RS-232C
PORTS
1
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)
SLOT4
SLOT 3
SLOT 2
SLOT 1
NOTE
2
L-----------------------------------..JL--------------------..J
__.0.___
&
NOTE3
ij
f
RANDOM [ : ] [ : ]
i
I ACCESS I
I MEMORY
RAM O RAM I I
I CARDS I
I I
I I
I I
r--------------------,
POWER SUPPLY ASSEMBLY
+SY, +12V, -12V
ON/STANDBY
SWITCH
RESET
SWITCH
POWER
SUPPLY
SET
FUSE AND
AC LINE FILTER
FAN
ASSEMBLY
L-----------------------------------..JL--------------------..J
NOTES:
1.
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. 3B2/300 AND 310 COMPUTERS HAVE 4 SLOTS. 3B2/400 COMPUTER HAS 12 SLOTS.
5. HARD DISK DRIVE 1 IS MOUNTED IN THE 3B2 COMPUTER CABINET
ONLY FOR 3B2/400. FOR 3B2/300 and 310, DRIVE 1 IS MOUNTED IN AN AT&T/XM.
Figure 3-1: 3B2/300/310/400 Computer - High-Level
Functional Block Diagram
3·4 TECHNICAL REFERENCE MANUAL