m
TRS-80 MODEL 111 OISIC SYS"
How TRSDOS
Uses MAM
trsdos is stored on the system diskette
included with
your
Disk System.
Each
time the Computer is turned on or
reset, the trsdos
master
program is
loaded
into ram
so it can take charge.
trsdos occupies approximately
40,000 bytes
of space on the
diskette; however,
only
a portion of that is in ram at once.
This is
possible because
trsdos
is
divided
into several independent
"modules."
The "resident" module is in
memory
at
all
times. It consists
of
input/output
drivers, tables, the command interpreter,
and
other essential routines.
Additional modules are loaded as needed,
and replaced
(or "overlaid")
by
other
modules when they are no longer
needed.
Note: After you enter
a
library
or utility
command,
you will usually
hear
trsdos accessing the system
disk. It is loading
an overlay
module which
contains the code necessary to
complete the
command.
The Memory Map in Figure
8 illustrates how
trsdos utilizes
the available
memory space.
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