Casio QT-2000 Service Manual page 26

Pin No. Name
101 EWR
102 EHLADK
103 EHLDRQ
104 _ERD
105 _E1WT
106 _E2WT
107 _EDCR1
108 VDD
109 _EDNK1
110 VSS
111 EDDDAT
112 EDDCLK
113 _EDNK2
114 _EDCR2
115 ESPBSY
116 _ESPNK
117 ESLPCR
118 EPRDAT
119 EPRCLK
120 ERJBSY
121 _ERJNK
122 _ERJCR
123 TEST1
124 E49MX1
3. GA2 (MN53020KSK)
Pin No. Name
1 VSS
2 XO
3 _K13
4 _K12
5 _K11
6 _K10
7 _K9
8 _K8
9 _K7
10 _K6
11 _K5
12 _K4
13 _K3
14 _K2
15 _K1
16 _K0
17 _KO11
18 _KO10
19 _KO9
20 _KO8
Description
Write strobe signal from CPU
Hold acknowledge signal from CPU
Hold request signal to CPU
Read signal
VCC
VCC
Data clear signal for back display
VCC
Data NACK signal for back display
GND
Data signal for back display
Clock signal for back display
Data NACK signal for remort display
Data clear signal for remort display
Busy signal for slip printer
NACK signal for slip printer
Data clear signal for slip printer
Data signal for slip printer
Clock signal for slip printer
GND
Interrupt signal from ARCNET controller
Not used
GND
Sub system clock 4.91MHz
Description
GND
Clock signal
Key input data signal (K13)
Key input data signal (K12)
Key input data signal (K11)
Key input data signal (K10)
Key input data signal (K9)
Key input data signal (K8)
Key input data signal (K7)
Key input data signal (K6)
Key input data signal (K5)
Key input data signal (K4)
Key input data signal (K3)
Key input data signal (K2)
Key input data signal (K1)
Key input data signal (K0)
Key common signal (KO11)
Key common signal (KO10)
Key common signal (KO9)
Key common signal (KO8)
— 24 —
I n / O u t
In
In
Out
In
In
In
Out
In
In
-
Out
Out
In
Out
In
In
Out
Out
Out
In
In
Out
In
In
I n / O u t
-
Out
In
In
In
In
In
In
In
In
In
In
In
In
In
In
Out
Out
Out
Out