Panasonic KX-W1500

5.2.3 Memory Map
The
CPU
can
normally
access
an
area
of
64
K
byte.
However,
the
KX-W1500
requires
a
628
k
byte
memory
area
(512
K
byte
area
for
the
program
and
dictionary,
76
K
byte
area
for
RAM,
and
40K
byte
area
for
I/O).
To
access
a
628
K
byte
memory
area,
the
CPU
uses
two
16
K
byte
Bank
Windows
(Bank-0
and
Bank-1).
The
ex-
tended
628
K
byte
memory
area
is
sectionalized
every
16
K
byte
and
each
of
these
sections
or
blocks
has
its
own
code.
When accessing
one
of these
memory
blocks,
the
biock’s
code
is
first
stored
into
the
Bank
Control
Register
by
the
CPU
and
then
the
Bank
Window
is
accessed.
The remainder of the memory area of the CPU (32 K byte) is allocated to Internal RAM (192 byte), SRAM (8 K
byte), Interface area to I/O and Operating Program (16 K byte).
KX-W1500 Memory Map
{FFF
veer
[
Ef
- FDC Command 4
Not Used
Area i
17FF
$1400 CRTC
= Command Area
13FF (ERPS)
Not <
Defined
FFF
$ C02 Output Port
$ CO1 Bank 1 Control “a
Register
$ COO Bank 0 Control
Register
BFF
$ 800 Input, Output
Port
7FF
0000
192 byte CPU Memory
FFFF 3FFFFF
ROM Area ROMCS3
37FFFF
Access Area
3FC000
~3FFFFF Not Used
{Lf | t ft jot tt fy ttt
BFFF 2FFFFF
r.
+ - Not Used
L Bank 1 Window 27F FFF
(16K) |
:
Not
Used
7FFF
re
1FFFFF
Not Used |
ARAM 100800 ~ 100FFF
VRAM 100000~ 1007FF
Bank 0 Window
:
! (6K
17FFFF
foe Le Le Fees Me
OFFFFF
Work RAM
(8K)
O7FFFF
000000_
DRAM for TEXT
(64 K byte)
080000 ~ O8FFFF
rae): eee
| EPCS
DRCS