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Hitachi MB-6890 Service Manual page 21

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is
uPD232C-328
4K
Byte
in
M -6890.
generator
1.
address
Memory
(A0=All}.
2.
The
content
of
'igl?Q2332C»§328,§,
Rom)
(4,096
MASK
BYTE
:sw
CSZEEE
Ao
Au
v¢¢Ae
Ae
EER E !
I B E EIEEU
Au
A5
AZ
A7
As
A5
A4
Address
M _ A
-~~-
.Data
Bus
m_g,
......
f5T.CSz
Chip Select
---~
5-8
Fig.
Mask
(Read
ROM
212
of
(4KB)
4,096
=
is
the
out-putted
memory
Fig.
9
1
1]
O4
os
D1
os
os
DZGNU
AO
D0
D'
Bus
only
Memory)
and
used
is
selected
by
12
through
8
data
character
as
address
line
lines
(DO-D7)

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