Casio QT-2000 Service Manual page 32

Pin No. Name
51 VSS GND
52 AD1 Address / Data bus (AD1)
53 AD0 Address / Data bus (AD0)
54 _RFSHOT Not used
55 ASTB Address strobe signal
56 IOXM IO / Memory select signal
57 BUFXRW Buffer read/write signal
58 CPUCLK Clock signal from CPU
59 _BUFEN Buffer enable signal
60 _WR Write signal
61 _RD Read signal
62 _RFSH GND
63 ICEAST GND
64 TEST GND
65 RW1 Memory write enable signal
66 RW2 Not used
67 _OE1 Memory output enable signal
68 _OE2 Not used
69 _CE0 Chip enable for MASS memory
70 _CE1 Chip enable for MASS memory
71 _CE2 Chip enable for MASS memory
72 _CE3 Chip enable for MASS memory
73 _CE4 Chip enable for MASS memory
74 _CE5 Chip enable for MASS memory
75 VSS GND
76 _CE6 Chip enable signal (Not used)
77 _CE7 Chip enable signal (Not used)
78 _CE8 Chip enable signal (Not used)
79 _CE9 Chip enable signal (Not used)
80 _CE10 Chip enable signal (Not used)
81 _CE11 Chip enable signal (Not used)
82 _CE12 Chip enable signal (Not used)
83 _CE13 Chip enable signal (Not used)
84 _CE14 Not used
85 _CE15 Chip select signal for LCD display
86 LS0 GND
87 VDDI VCC
88 LS1 VCC
89 LS2 GND
90 IOLS0 GND
91 IOLS1 GND
92 IOLS2 GND
93 IOLS3 GND
94 SELECT GND
95 _INTIN VCC
96 CEIN GND
97 CEOT Not used
98 MD0 Data signal for MASS memory (MD0)
99 MD1 Data signal for MASS memory (MD1)
100 VDD VCC
Description
— 30 —
I n / O u t
-
In /Out
In / Out
Out
In
In
In
In
In
In
In
In
In
In
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
-
-
-
-
-
-
-
-
-
-
Out
In
In
In
In
In
In
In
In
In
In
In
Out
In / Out
In / Out
In