Tandy 2000 Service Manual page 8

Tandy@
Model
2000
Service
l.Ianua1
Fig.
No.
L.I
L.2
1.3
7
.L
7.la
7.2
7
.3
7.4
7.5
-l
.5
7
.7
7
.8
7
.9
7.
r0
7.1r
7/L2
7.
13
7.L4
7 .
15
7.
15
7
.L7
7.18
7
.L9
7
.20
7
.2L
7
.22
7
.23
7.24
7
.25
7
.26
7
.27
7
.28
7
.29
7
.30
7.
3l
7
.32
Lis
t of
Figures
Descr
iption Page No.
Ivlodel 2000 Computer Assembly .. o......
o
.
2
llodel
2000
Major
Copmponent
Subassemblies
3
External Plug-in Option Cards
,...o-r.,.
6
I,Iodel
20C0
Functional Block
Diagram
.o.o
42
CPU
Block Diagram ..........
,............
45
80186 Progfalnmed Chip SeleCtS o.........
46
Peripheral Chip Select 0 Address
oo.,...
47
Dl,lA
Acknowledge
Address Assignments
r.,.
47
DMA
Channel COntfOl
REgiStef ....oo..oo.
49
Bus Interfacg Block Oiagram ..-.........
51
timing
Par€rmetgr
Diagram o..............
57
CRT
Controller/Ivlain Video Logic ........
59
Charactgr Ggnerator .,
o. .
r..,.
o
o.,.,..
r.
67
Intefrupt COntfOllef /gOOt
ROIt{
..r...,o.o
59
Interrupt Controller Register Assignments
7 0
InLerrubt Controller Input Assignments .
7L
Block Diagram, CIock/pLL ..,. o.........
.
72
Block Diagramt CIock/pLL (sheet 8) .r.,.
73
MOdeI
2000 PLL BIOCk
Diagfam ... o.. r... .
'1
4
Mgmory
Timing and Control .rorr,,,o...r.
78
RAM
Controller IFL Output Definitions
o.
79
Floppy Disk Controllgr
......
...........
84
FIt{
EncOding Scheme
..............,'.....
.
87
MFII{
EncOding Schgme
....,r.....
r....
r
r.. .
87
Ser
ial Inter
f
ac
e/
Programmable
Timer
r
.
o
o
I
I
ParalleL/xeyboard Interface ....
o.
o.. o..
93
Load Box . r. r.... o.
o
o......
r r......... t.
L47
Load Box Assgmbly
... r..........
o. o.....
L47
Tgst Circuit
. f... r.
o
o......
o.. f.......
r I48
Wavgform .... o.....
o..... o.....
r. o......
148
Test
Equipment
Sgtup ..oo.......o..o....
I49
Base of Q15 .r.ro..o.o..ror........orr.f
150
Q15
Collector
Waveform
.................
151
Wavgform
of
U3,
Pin 8 ..................
151
Chip Oscillator,
Pin 5 ......
.. o...
e
... .
L52
Basic Flyback Convgrter
.....oo.r....o..
I53
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