3 Memory map
The
MZ-800 has a different
memory
map depending on
Q MZ-800
memory
map
EOOO
0000
MAIN
D-RAM
8000
-----
- 64-K&-- -
4000
2000
1000
oooo.
MZ-700mode
D
bd
.---,
~
~
ROM
VRAM
MZ-800
mode
MAIN
D-RAM
the mode. To have compatibility
with
the MZ-700, it has
two
modes
of
the MZ-700 mode and MZ-800 mode.
~
t:J
-
[]
\J
D
DV-RA~--,
I I I I
I I I
1
I I l D I
!m}
I
I : : :
------
-L
••
.J
._
__
J
r---,
I I
I I
:
IIVI
I
' I
o I
L--..1
~
640 x 200
mode
~
VRAM
320 x 200
mode
NOTE:
r---.
I I
:m:
I I
...
__
.J
Item
within
darted line
represent!l
an
option
unit
MZ-1R2S
Memory
map
changes after initial program loading
$0000
$1000
$2000
@ Power
on
(reset)
MZ-800
mode
MON. ROM
CG.
ROM
DRAM
@At
start
of
monitor
MZ-700
mode
$0000
...--------.
MON.
ROM
$1000
~------1
LD
A,
OSH
©Write
to
PCG
from
CG
MZ-700
mode
$0000
$1000
$2000
MON.
ROM
CG.
ROM
@ System operation
MZ-700 & 800
modes
$0000
OUT
(CE), A
IN
(EOH),
A
$8000
=>
DRAM
V-RAM
(320x200
mode)
DRAM
$0000
V-RAM
$EOOO
$EOOO
$E010
MON.
ROM
MON.
ROM
$FFFF
$FFFF
• Memory map at
power
on
is
in
the MZ-800 mode
as
in
@,
but
it changes
to
the MZ-700 mode by the
monitor
ROM
when the
monitor
program starts. After
transferring the
CG
data
to
the VRAM
PCG
area
from
the
CG
ROM
at @, the
memory
map then returns
to
@.
• When the system program is completed
to
load, the
memory
map goes into the MZ-700 mode
if
the
system switch (SW1) is set
to
ON
side. If set
to
OFF
side, it changes
to
the MZ-800 mode, then the
memory
map
as
in
@.
During those changes, all
memory
spaces are composed
of
RAM and isolated
from
ROM
and VRAM.
3
D-RAM
D-RAM
==>
IN (E1H), A
<=
$COOO
V-RAM (CG)
$0000
V-RAM
$EOOO
$E010
MON.
ROM
$FFFF
SFFFF
'---------'
• Depression
of
the manual reset switch
~ssumes
memory
map transition in order
of
@
---+
@
---+
@
---+
@, similar
as
in the case
of
power
on.
• ·However, depression
of
the reset switch in conjunc-
tion
with
the I
CTRL
I key assumes the
memory
map
of
@after
being changed once
to
the MZ-700
or
MZ-800
mode depending on the state
of
the system switch. In
the case
of
the MZ-800 mode,
it
is set
to
the plane I,
II
(4-color mode)
of
the 320 x 200 mode.
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