3
1.1.1 Memory configuration
Random access memory (RAM) is
the
type
of
memory which
is
most naturally suited
to
comput-
ers. When this
type
of
memory is employed,
the
user can select
the
programming language and the pro-
gram
to
be executed
at
will.
The
MZ-80B employs this
method
to
allow
you
to
select
the
programming
language which best suits
your
purpose.
Further
,
if
you
want
the
computer
to
execute a machine
language program,
you
can code and execute it.
In
the
MZ-80B,
the
IPL (Initial Program Loader) automatically loads programs which are stored
on
cassette
tape
or
(if
a disk drive
is
connected) diske
tte
into
the
main memory when
the
power
is
turned
on
,
then
transfers control
to
the
program loaded. Initial program loading from cassette tape
is
com-
pleted in a few minutes; loading from a diskette
is
accomplished in seconds.
The IPL
is
stored in
ROM
(Read Only Memory). This
ROM
address space
is
different from
that
of
the
main memory, and it
is
automatically activated when
the
power
is
turned on. See FIGURE 1.2.
Main Memory
64k
bytes
(32k
bytes
: Optional)
RAM
Normal state
c
p
u
Boot state
FIGURE 1.2
IPL
ROM
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