Specifications
1.1.3.3 Console Terminal Connector
The
console cable is connected to
the
CPU cover panel
through
a modified
modular
jack
(MMJ).
An
internal
cable connects
the
MMJ, switches,
and
LED display to
the
CPU module.
1.1.3.4 Battery Backup Unit (BBU)
A
battery
backup
unit
(BBU), located on
the
inside of
the
CPU
cover
panel,
maintains
the
correct time-of-year
and
language selection on
the
CPU
module when power to
the
system
is
turned
off.
Both
the
time-of-year
and
language selection code
are
lost
if
the
BBU fails. The BBU provides
power for
up
to seven days
if
the
system power is
turned
off.
1.1.3.5 Ethernet Logic
A
printed
circuit board
and
switch
support
the
two
Ethernet
ports.
1.2 Base System Specifications
The
base system includes a KA640-AAlBA processor
and
one
to
three
MS650 memory modules.
1.2.1 KA640-AA/BA Processor Specifications
MicroVAX 3400 systems
use
the
KA640-AA processor. VAXserver 3400
systems
use
the
KA640-BA.
The
only difference is
the
-AA
is
for
multiuser
systems
and
the
-BA
is for single-user systems.
Central
Processor
C
Clock
rate
Data
path
width
Number
of
data
types
Number
of instructions
General
purpose registers
Addressing modes
Specification
20 MHz
32
bits
Hardware:
9
Software emulated: 7
Hardware:
272
Software emulated: 32
16 (32-bit wide)
General
register: 8
Program
counter: 4
Index: 9
1-10
MicroVAX 3400 VAXserver 3400 Technical Information