Table Of Contents - Tandy 1000 SL Technical Reference Manual

Table Of
Contents
Introduction
1
General Description
1
Specifications Summary 2
Optional Features
2
System Assembly/Disassembly (Including Exploded Views)
3
Main Logic Board
5
I
n t r od u c t
i
on 5
Switch Settings and Jumper Pin Configurations
6
Theory of Operation
7
8086 Microprocessor
7
8087 Numerical Math Coprocessor
7
Clock Generation
7
Command and Control Signal Generation 8
DRAM Control
9
Refresh Control
9
BIOS ROM Control
10
Reset Circuit
10
Wait State and Ready Logic
10
NMI Logic
1 2
8087 Control Logic
12
CPU Address Buffers 1 2
Data Buffers and Conversion Logic
12
1/0 Decode
13
Floppy Disk Controller 13
Interrupt Controller 1 4
video controller
15
Timer
16
Joystick Interface
16
Keyboard Interface
17
Sound Circuit
17
Additional Sound Features (DAC)
17
DMA Controller 18
RS232 Serial Port Interface 18
Parallel Printer Port Interface
19
Expansion Ports
20
System Expansion Bus 20
Expansion Bus Signal Description
21
Memory Map
23
1/0 Port Map of System 24
1/0 Port Map Summary 24