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RCA Spectra 70 Training Manual
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Exercise:
T
FLAIl
I/o
OPERATrONS
overlap
other
operations
in
the
70/25.
T
F
2.
All
r/o
instructions
are
two
address
(6
byte)
format.
T
F
3.
On
the
70/25
one
to
eight
r/o
channels
are
available.
T
F
4.
If
an
r/o
device
is
busy
when
an
r/o
instruction
using
that
device
is
at-
tempted,
a
hold
off
will
occur
and
the
instruction
will
be
restaticized
until
the
device
becomes
available.
T
F
5.
After
an
r/o
instruction
is
performed,
a
Condition
Code
setting
of
3
indicates
rnterrupt
pending.
T
F
6.
The
direction
of
operation
for
all
r/o
instructions
is
from
left
to
right.
T
F
7.
The
instruction
that
tests
for
an
error
condition
after
an
r/o
instruction
is
the
POST
STATUS
instruction.
T
F
8.
Unless
inhibited
an
interrupt
takes
place
after
each
r/o
command.
T
F
9.
The
purpose
of
r/o
termination
inter-
rupt
is
to
transfer
the
Standard
Device
Byte
into
HSM.
T
F
10.
A
Post
Status
Command
will
terminate,
and
control
will
be
passed
to
the
next
T
57
instruction
if
the
channel
addressed
is
busy.
F
11.
If
a
device
is
inoperable,
and
a
read
orwrite
is
directed
to
it,
the
Secondary
Indicator
of
the
Standard
Device
Byte
is
set
and
int-errupt
takes
place.
12.
What
are
some
ofthe
uses
of
the
WRITE
CONTROL
instruction?
13.
What
are
the
formats
of
the
70/25
I/O
instructions?
14.
What
does
the
Sl
field
contain
in
an
1/
a
instruction?
15.
Write
a
Read
Forward
and
a
Read
Re-
verse
instruction
which
will
read
data
from
trunk
#2,
unit
#2,
into
the
area
0100-0110.
16.
Write
the
necessary
instructions
to:
a.
Read
a
Card
b.
Punch
a
Card
c.
Write
a
message
to
the
console
typewriter.
d.
Read
a
message
from
magnetic
tape.
Include
the
sensing,
the
condition
code,
POST
STATUS,
I/O
SENSE,
for
each
operation.
62
Table of Contents
Table of Contents
4
General Description
7
High-Speed Memory
9
Introduction
9
HSM Addressing
9
Hexadecimal Numbering System
10
Exercise
11
Data and Instruction Format
12
Data Formats
12
Unpacked Format
12
Edited Format
12
Machine Instruction Format
13
Exercise
13
Interrupt
15
Introduction
15
Programming States
15
Processing State
15
Interrupt State
15
Types of Interrupt
15
I/O Interrupt
15
Operation Code Trap
16
Arithmetic Overflow and Divide Exception
16
Elapsed Timer Interrupt
17
Inhibiting Interrupt
17
Exercise
17
Summary of Interrupt Logic
18
Elapsed Time Clock
19
Introduction to the RCA 70/25 Assembly Language
20
Format Requirements
20
Addressing
20
Self-Defining Values
22
Expressions
22
Implied Lengths
23
Assembler Controlling Codes
23
Define Storage (DS)
24
Origin Code (ORG)
24
Constant Definition (DC)
24
Program Linking Codes (ENTRY and EXTRH)
25
Run and Segment Controlling Codes (START, END, CSECT)
26
Equate Code (EQU)
27
Base Register Controlling Codes (USING, DROP)
27
Extended Mnemonic Instructions
27
Exercise
28
Instruction Complement
30
Data Movement Instructions
30
Move Character (MVC)
30
Exercises
31
Packing and Unpacking Data (PACK and UNPK)
32
Exercises
33
Decimal Arithmetic Instructions
35
Decimal Add (AP) and Subtract (SP)
35
Decimal Multiply (MP)
36
Decimal Divide (DP)
37
Exercises
37
Data Editing Instruction (ED)
39
Examples
40
Exercises
41
Comparison and Branching Instructions
43
Compare Logical (C LC)
43
Compare Decimal (CP)
43
Branch on Condition (BC)
44
Branch and Link (BAL)
44
Branch on Count (BCT)
45
Set P2 Register (STP2)
45
Exercises
45
Load and Store Instructions
47
Load Multiple (LM)
47
Store Multiple (STM)
47
Binary Arithmetic Instructions
48
Binary Add (AB) and Subtract (SB)
48
Exercise
48
Logical Instructions
51
Logical and (NC)
51
Logical or (OC)
51
Exclusive or (XC)
51
Use of Logicals
52
Test under Mask Instruction (TM)
53
Data Translation, Translate (TR)
53
Inputloutput
55
Introduction
55
Read Instructions (RDF) and (RDR)
55
Writing Data (WR) and (WRE)
56
Controlling Peripheral Devices
56
Error Recognition
57
Logic
59
Standard Device Byte
59
Sensing Exceptional Conditions
59
Peripheral Unit Sense Bytes
60
Summary of 1/0 Logic
61
Example of 110 Coding
62
Exercise
63
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RCA Spectra 70 Specifications
General
Brand
RCA
Model
Spectra 70
Category
Computer Hardware
Language
English
Related product manuals
RCA 70/46
260 pages
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