MicroLab
|
Instruction
Section
5
MICROLAB
!
THEORY
OF
OPERATION
Introduction
In
Section
2
of
this
manual,
we
talked
about the
MicroLab
|
from an
operator’s
point
of
view.
In
this
section, we'll
explore
the inner
workings
of
the
MicroLab
|,
First, we'll
look
at
an overview
of
the
MicroLab|, including
a
discussion
of
how
the hardware and
firmware
work
together. Then we'll get into
the
detailed
operation
of
the
MicroLab
|
hardware.
Schematics
Throughout this section, references
are made
to
the
schematics
at the rear
of
this
manual.
Notice
that each
of
the schematic
pages
is
divided
into
operational areas
by
a
grey
tint.
Generally, the
discussions
within
this section
follow
this
pattern. The
block
diagram located
in
this
section
is
laid
out
into
the
same
operational
areas
as
the
schematics.
In
this section, each
major
heading has alongside
it
a
schematic
number
and
a
grid,
as
shown
in
Fig.
5-1.
PROGRAM
COUNTER REGISTERS
Schematic
aa.
Area of
Schematic
Text
Subject
(2631 -35)2887-1
Fig.
5-1.
Example Of Text Heading.
This example
shows
us
that
the
subject
of
the
text
is
the
program
counter
registers,
that the registers are
shown
on
schematic
5,
and that the registers are
located
in
the
upper
left
portion
of
schematic
5.
REV A
JUN
1980
Personality Cards
The
detailed
theory
of
operation
for
a
given personality card
is
contained
in
the
Instruction Manual supplement
for
that
personality card. Insert
the
service portion
of
each
Per-
sonality
Card
Supplement
in
Section
11,
at
the
rear
of
this
manual.
Overview
The
MicroLab
|
(with
a personality card installed) can be
divided
into
three
major
blocks:
keypad/display
logic;
the
MicroLab
|
mainframe;
and the
personality card.
All
three
of
these
divisions
are
shown
in
Fig.
5-2.
Figure 5-2
also shows
how
these
blocks
communicate
with
one
another.
An
address bus
and a data
bus connect
each
of
the
major
sections
of
the
MicroLab
|.
These
buses
allow
the microprocessor
in
the
personality card to control the
actions
of
the
MicroLab
|
Power-up
In
order to explore how
the
MicroLab
|
operates,
let's
look
at
its
operation
at power-up.
Recall
that the
operating system
monitor
resides
within
PROM
on
the
personality
card.
(Some
personality cards
require
that the
monitor be an
emulator processor’s
program memory. We'll
only
discuss
the
PROM-based monitor
in
this
example.)
The
monitor
tells
the microprocessor what
to
do
during keypad
entry,
self-test
routines,
and other
operations.
When
power
is
first applied
to
the
MicroLabl,
the
microprocessor
on the personality card
is
reset.
The
reset
causes
the microprocessor
to begin execution
of a
reset
routine
located
in
PROM.
As
described
in
the operator's
portion
of
this
manual,
a
reset causes
the display to be
cleared
and replaced with
a
greeting message.
The
greeting message
is
also sent
to
the
terminal RS-232-C
port for display on an optional terminal.
And,
at reset,
the
software relocatable
RAM
is
positioned
to
its
default
base
address.
Summary of Contents for 067-0892-00
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