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Tandy 1000 Technical Reference Manual

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Tandy 1000
Technical Reference Manual
INTRODUCTION TO THE 300 BAUD MODEM
The
300 baud modem
is
a plug-in option for the Tandy 1000.
This
modem
is
an
auto answer-auto originate device with tone and pulse-type dialer cir-
cuitry. See Figure 21.
It
is
controlled by a 6805 single-chip microprocessor
(U7), and simple ASCII commands control the operation
of
the modem.
These
ASCII
commands are supplied through the on-board
UART.
The
UART
converts parallel commands to serial data for the modem. The microprocessor
converts the serial data into parallel data and controls the modem using the
input/output ports.
The
modem circuitry
is
divided into
six
major subsections:
• Modem filter
• Carrier detect section
• UART
• Microprocessor section
• Tone dialer section
• Telephone interface section
85

Table of Contents

Other manuals for Tandy 1000

Preview: User Guide
User Guide337 pages
Preview: Programmer's Reference Guide
Programmer's Reference Guide251 pages
Preview: Basic Reference Manual
Basic Reference Manual411 pages
Preview: Owner's Manual
Owner's Manual46 pages

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Tandy 1000 Specifications

General IconGeneral
ProcessorIntel 8088
Processor Speed4.77 MHz
RAM128 KB (expandable to 640 KB)
Operating SystemMS-DOS 2.11
ManufacturerTandy Corporation
Release Year1984
StorageSingle or double 5.25" floppy disk drive (360 KB), optional hard drive
SoundTandy 3-voice sound
PortsParallel, Serial
GraphicsCGA (Color Graphics Adapter)
Graphics Modes320x200, 640x200

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