Memory - Olivetti ECR 7100 Service Manual

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4-13 MEMORY

Memory uses BS62LV256 RAM (Random Access Memory) chips.
The RAM chips are addressed directly by the CPU.
PIN configuration
Pin Name
Circuit Diagram
56
A14
1
A12
2
A7
3
A6
4
A5
5
A4
6
A3
7
BS62LV256SC
A2
8
A1
9
A0
10
DQ0
11
DQ1
12
DQ2
13
GND
14
Address Input
A0-A14
CE
Chip Enable
WE
Write Enable
OE
Output Enable
DQ0-7
Data Input/output
VCC
Power
GND
Ground
U2
D0
13
D0
D1
14
D1
D2
15
D2
D3
17
D3
D4
18
D4
D5
19
D5
D6
20
D6
D7
21
D7
RM2
10Kx8
VBB
32
VCC
C6
16
0.1uF
GND
BS62LV256(1027)
ECR7100 Service Manual
28
VCC
27
/ WE
26
A13
25
A8
24
A9
23
A11
22
/ OE
21
A10
20
/ CE
19
DQ7
18
DQ6
17
DQ5
16
DQ4
15
DQ3
12
A0
A0
11
A1
A1
10
A2
A2
9
A3
A3
8
A4
A4
7
A5
A5
6
A6
A6
5
A7
A7
27
A8
A8
26
A9
A9
23
A10
A10
25
A11
A11
4
A12
A12
28
A13
A13
3
A14
A14
31
R18
A15
2
R19
A16
1
NC
VBB
30
CE2
22
CE#
CE1
29
WE#
WE
24
RD#
OE
VBB
*10K
*10K
Y110910 - 8

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