Radio Shack Telephone Interface II Trsdos & Disk Basic Reference Manual

General
Information
Introduction
This
book is a
combined
operation
and
reference
manual
for
the
TRS-80
Disk
Operating
System.
It
will tell
you how
to
operate
the
hardware
and
how
to use
the software.
For
many
of
you, there
will
be more
than enough
information.
("All
I
want
to
do is use
the
Computer,
not
understand
it!")
Don't
worry,
this book
is
designed
so that
you can
start
programming
in DISK
BASIC
(if
that's what
you want
to do) right
away.
All
you have
to
do
is read
the
chapter
on Mini
Disk
Operation
. . . skim
through
TRSDOS
Overview
and
TRSDOS
Commands
... and
on to DISK
BASIC.
But
DISK
BASIC
is just one aspect of TRSDOS.
It's not
a
part of
TRSDOS,
but
a
program
that TRSDOS
executes.
Using
DISK
BASIC
without
any awareness
of the
capabilities
of
TRSDOS
is
rather like
riding
in
a
Pullman
car
without any
knowledge
of
the
engine,
freight
cars,
diner
and
other parts
of a train.
It's true
that
TRSDOS will
do all
that's
necessary
to
let
you
ride
comfortably
along
in
BASIC;
but
eventually
you're
going
to want
to have
a say
in where
the train
goes, what
its
schedule
is,
and what
goes in
all
those freight
cars. That's
when
you need
to understand
TRSDOS.
The illustration
below
shows
the
relationship
between
the
Computer,
Expansion
Interface
and Mini
Disk
Drives.
The first
drive(Drive
0)
always
contains
the TRSDOS
diskette,
which
is
pre-recorded with
the Operating
System
software:
an
executive
program,
and
several
auxiliary
programs, including
DISK
BASIC.
The executive
program
is loaded
into the
first 4K
bytes
of
RAM,
and
stays there
while TRSDOS
is
in control.
The
auxiliary
programs
are loaded
as needed.
Second, third
and fourth
drives can contain
diskettes,
for
storing your programs and
data.
The
Expansion
Interface
contains
the real-
time
clock,
disk controller IC,
and optional
extra RAM
(addresses
above
32767).
The
Keyboard/Computer
contains a built-in (ROM)
program which
takes over
at power-up, and loads
the TRSDOS executive
program from the
system
diskette
(in Drive
0).
If
the Mini Disk equipment
is
not connected, this ROM
program can transfer control
to
LEVEL
II BASIC.
1-2

Radio Shack Telephone Interface II Specifications

General

Brand	Radio Shack
Model	Telephone Interface II
Category	Desktop
Language	English