Operational
Characteristics
(Cont'd)
FEATURE
5019-46
ELAPSED
TIME
CLOCK
Operational
Characteristics
FEATURE
5003-46
DIRECT
CONTROL
Operational
Characteristin
FEATURE
5040
SELECTOR
CHANNEL *
FEATURE
5041
SELECTO'R
CHANNEL *
FEATURE
5042
SELECTOR
CHANNEL *
Optional
Features
When
an
elapsed time clock
interrupt
occurs,
the
clock
may
have been
decremented several times before
the
interrupt
takes
effect, depending on
the
execution
time
of
the
current
instruction.
•
This
feature
provides
an
elapsed time clock
with
a
greater
resolution
than
the
5002-46 clock. The 5019-46 clock is decremented
at
a 1000-
cycle
rate.
•
The
elapsed time clock count is performed by
decrementing
the
elapsed
time clock word
at
main
memory location 80. The word is decremented
by
4Dlfi
every 1002 microseconds. When the clock count word changes
from
positive to negative,
if
the
applicable
program
mask
bit
is set, a
program
interrupt
occurs.
• The
Direct
Control
feature
enables one
70/46
processor
program
to
directly signal
the
programs
of
from
one to five
other
processors over
an
interface
independent of
the
input/output
channels. The processors directly
connected by
this
feature
may
be remotely located
up
to 500 cable feet
from
the
transmitting
processor.
• Two additional privileged
instructions
are
provided
with
this
option,
Write
Direct
and
Read Direct, which
initiate
the
transfer
of
one byte
of
control
information
between processor memories,
and
which signal
the
opposite
unit
(by
external
interrupt)
upon execution
of
an
instruction.
This
feature
can
also
initiate
initial
program
loading
in
a remote
processor which is in a stopped state.
In
this
case,
the
Load
Unit
Switches
on
the
console
of
the
processor being signaled specify
the
device
from
which
the
loading is to occur
and
the
information
byte is ignored.
•
This
feature
provides two enhanced selector channels
for
a system
maximum
of
12
I/O
Trunks
and
the
Console
Trunk.
•
This
features
provides
three
enhanced selector channels
for
a system
maximum
of 14
I/O
Trunks
and
the
Console
Trunk.
• This
feature
provides
four
enhanced selector channels
for
a
system
maximum
of
16
I/O
Trunks
and
the
Console
Trunk.
*
Only
one
feature
(5040,5041
01'
5042)
is
permitted
on
a
system.
221
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