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RCA Spectra 70 Training Manual
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The
binary
values
of
all
alphabetic
and
numeric
char-
acters
range
as
follows:
A
to
I
inclusive
193
10
to
201
10
J
to
R
inclusive
20510
to
21710
S
to
Z
inclusive
226
10
to
23310
o
to
9
inclusive
24010
to
24910
The
table
could
be
allocated
by
the
DC
(Define
Con-
stant)
code
as
follows:
NAME
OPERATION
OPERAND
TABLE
DC
193x'FF'
DC
9x'OO'
A
to
I
DC
7x'FF'
DC
9x'00'
J
to
R
DC
8x
'
FF'
DC
8x'OO'
S
to
Z
DC
6x'FF'
DC
10x'OO'
o
to
9
DC
6x'FF'
48
Then,
using
instructions
similar
to
those
in
the
pre-
ceding
example,
a
field
could
be
tested
for
alpha
or
numeric
content.
Any
other
character
will
translate
into
a
1
bit-filled
byte.
For
example,
assume
the
field
contained
a
period,
an
invalid
character.
A
period
(.)
has
a
bi-
nary
value
of
01001011
2
or
75
10
,
It
would
address
the
75th
position
of
the
table
and
be
replaced
by
a
1
bit-filled
byte.
The
previous
examples
have
illustrated
the
Translate
instruction
for
validation.
A
table
of
this
type
is
fairly
easy
for
the
programmer
to
construct
using
the
DC
and
DS
codes.
For
translating
from
one
code
to
another,
such
as
from
the
ASCII
to
the
EBCDIC
code
a
prepared
table
could
be
used
which
would
be
entered
into
memory
from
an
input
device.
53
55
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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Reference Manual
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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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