Table Of Contents - Radio Shack TRS-80 26-3650 Service Manual

CONTENTS
I.
POCKET COMPUTER
(26-3650)
&
MEMORY MODULE
(26-3653)
1.
SPECIFICATIONS
-,
2.
BLOCK DIAGRAM
3
3.
CPU
(Central Processing Unit)
3-1
Features
4
3-2
CPU
Block Diagram
4
3-3
CPU
Signal Descriptions
5
4.
RAM
(Random
Access
Memory)
5.
SERVICING
5-1
Disassembly
7
5-2
Troubleshooting
3
A
Display
g
B
Key Entry
g
C RAMI
g
D
RAM2
9
E
Discrimination
Between
CPU
and
RAMI
10
5-3
Test
Program
11
6.
PROGRAM COMMAND
LIST
13
7.
ERROR MESSAGE
LIST
15
II.
CASSETTE INTERFACE
(26-3651)
1.
SPECIFICATIONS
16
2.
BLOCK DIAGRAM
16
3.
LSI
(HD431
10)
17
4.
CIRCUMFERENCE
CIRCUITS
4-1
Clock
Pulse
Generator
18
4-2
Remote
Control Circuit
18
4-3
Shaping Circuit
and
Filter
18
5.
SERVICING
5-1
Disassembly
20
5-2
Troubleshooting
21
III.
CIRCUIT
DIAGRAM
1.
26-3650
22
2.
26-3651
23
IV.
PRINTED CIRCUIT
BOARD
1.
26-3650
24
2.
26-3651
24
3.
26-3653
25
VI.
PARTS
LIST
1.
26-3650
26
2.
26-3651
29