5
In
every formatted disk, there
~
a directory which contains disk
information (disk
name
, disk
ID
, file
table
and
bit-
map
for block
status indicotion, see
appendix)
.
The
directory file
is
located
on
track
18.
(For
more detail, see
appendix)
The
information collection of the disk
is
called
file.
From
the file
VECTOR
table
(in
the directory), we know the location of where
the sector of the file
starts.
Follow the pointer of
each
sector then
the entire file
could
be
found
and
the
program
file wi
ll
be
loaded
in
computer memory
aulomatically
.
The
built-
in
RAM
is
not only support for the
system
operation
but
also shorten the internal
data
processing time.
It
can
enl
arge
the
1/0
buffer to
speed
up
the transfer rate.
For
more
advanced
user,
helshe
can
write
program
on the
memory.
Then,
a multiple processing environment one
can
enjoy.
Here,
is
the
toble
of
RAM
usage.
RAM
page
Contents
0
system
register
1 buffer for
GCR
2 drive information
3
#0
buffer zero
4
#1
buffer
one
5
#2
buffer two
6
#3
buffer three
7
#4
buffer four
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