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10.
PERIPHERAL
DEVICE
ACCESS
PG
256kHz
VA
MA
«
MSM6283-05GS
5
—
о
S
e
Ф
5 E
Š
ὦ
RESET 5 ©
K013
Q
ن
5 4
АО
8
=
со
-
-
с
N
h
9
°
26
А14
+
q
253
100
ы
а
9%
2
ES
=
a
107
Address bus
AO ~ A14 _
Data bus DO ~ D7
uPD43256C-12L is a 256Kbit RAM for storing sampling sounds and Demo Music ROM data. The data in
RAM are kept even power switch OFF as long as DC7.5V is provided.
uPD23C256EAC is a 256Kbit ROM and contains preset tone, percussion data, and system execution
program.
М5М6294-02 is a percussion generator and issues percussion sounds in accordance with the data from
CPU.
The chip select condition is as follows.
Ship selection
A15
CE
CE1
RAM
L
L
×
Н: High level
ROM
H
L
|
X
|
L: Low level
===
X: irrelevant
Percussion generator
x
x
L
|
— 14 —
i| H η TEL TEL TEL EL TEL TEL EL ¦] ]ا ¦] TL | TLUT ¦ ¦ ¦ | ا
رىا رىن نسا ئزτ
' 7
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