Tandy 1000
Technical Reference Manual
INTRODUCTION TO THE TANDY 1000 COMPUTER
The Tandy 1000 Computer
is
modular
in
design to allow maximum flexibility
in
system configuration. The computer consists of a Main Unit, a detachable
keyboard with coiled cable, and a monitor. The Main Unit
is
supplied with one
internal floppy disk drive.
(A
second floppy disk drive
is
optional.) The stan-
dard types of monitors used with the Tandy 1000 are the monochrome com-
posite and the color
RGB
monitor. Since these units are modular, they may
be
placed on top of the Main Unit or
at
any convenient location.
Internal storage
is
expanded by adding a second
51/4"
floppy disk drive. Each
disk drive has a capacity of 360K bytes formatted.
The Tandy 1000 has a standard 128K of system RAM. An optional DMA/RAM
board allows the Tandy 1000 to be expanded
in
increments of 128K of RAM.
This board
will
fit into one of the expansion slots. With two fully populated RAM
boards installed, the Tandy 1000
will
have 640K bytes of maximum
RAM
allow-
ed by the system memory map.
Other features include a parallel printer port, two built-in joystick interfaces,
a speaker for audio feedback, and a light pen interface.
The
Main Unit
is
the heart of the Tandy 1000.
It
houses the Main Logic
Assembly, system power supply, and floppy disk drives.
The
Main Logic Assembly
is
a large board mounted to the bottom of the Main
Unit and interconnected to the keyboard, power supply, and disk drives by
a series of cables. The illustration
in
Figure 1 shows the major components
of
a Tandy 1000 system.
The
Power Supply
is
a 54W switching regulator type, designed to provide ade-
quate power capacity for a fully configured system using
all
the option slots.
The
Floppy Disk Drive uses
51/4"
double-sided, double-density diskettes to read,
write, or store
dpta. These are soft sector diskettes.
The
Disk Drive assembly
is
installed
in
the standard unit. The floppy disk stores approximately 360K
bytes (formatted) of data.
All
system programs, with the exception
of
the system
startup sequence, are stored on disk.
Either a monochrome or a color display may be used with the Tandy 1000.
The monochrome monitor
is
a high-resolution green phosphor display which
provides excellent visual quality.
It
features a
12"
screen with
an
anti-glare sur-
face. Each display
is
capable of 25 lines of 80 characters. The character matrix
is
8 wide x 9 high.
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