Casio QT-2000 Service Manual page 24

2. GA1(MN53040KSF1)
Pin No. Name
1 E49MX2
2 SVSS
3 EADB0
4 EADB1
5 EADB2
6 EADB3
7 EADB4
8 EADB5
9 SVSS
10 EADB6
11 EADB7
12 EADB8
13 EADB9
14 EADB10
15 VDD
16 EADB11
17 VSS
18 EADB12
19 EADB13
20 EADB14
21 EADB15
22 EADB16
23 SVSS
24 EROMDC
25 _EMRD
26 _EXINT
27 _EMWR
28 _ECGA2
29 _ERSET
30 _ECRA0
31 _ECRA1
32 _ECRA2
33 _ECRA3
34 EADB17
35 EADB18
36 EADB19
37 E1MN4M
38 _ECR04
39 _ECR03
40 _ECR02
41 _ECR01
42 _ECR00
43 _EIREQ
44 EIASTB
45 EIHDAK
46 VSS
47 _EIACK
48 VDD
49 EIHDRQ
50 EAD0
Description
Sub clock 4.92MHz
GND
Address bus (EADB0)
Address bus (EADB1)
Address bus (EADB2)
Address bus (EADB3)
Address bus (EADB4)
Address bus (EADB5)
GND
Address bus (EADB6)
Address bus (EADB7)
Address bus (EADB8)
Address bus (EADB9)
Address bus (EADB10)
VCC
Address bus (EADB11)
GND
Address bus (EADB12)
Address bus (EADB13)
Address bus (EADB14)
Address bus (EADB15)
Address bus (EADB16)
GND
Direction select signal
Output enable signal for system RAM
Interruput signal from GA2,3,4
Memory write signal
Chip select signal for GA2
Reset signal
Bank select signal for RAM
Bank select signal for RAM
Bank select signal for RAM
Bank select signal for RAM
Address bus (EADB17)
Address bus (EADB18)
Not used
VCC
Chip enable for ROM
Chip enable for FROM
Chip enable for FROM
Chip enable for FROM
Chip enable for FROM
VCC
GND
GND
GND
Not used
VCC
Not used
Address / Data bus (AD0)
— 22 —
I n / O u t
Out
-
Out
Out
Out
Out
Out
Out
-
Out
Out
Out
Out
Out
In
Out
-
Out
Out
Out
Out
Out
-
Out
Out
In
Out
Out
In
Out
Out
Out
Out
Out
Out
-
In
Out
Out
Out
Out
Out
In
In
In
-
Out
In
Out
In/Out