Casio WK-1800 Service Manual page 17

Pin No. Terminal
90 ~ 92
93 VCC
94, 95
97 ~ 105
EA0 ~ EA14
107, 109
110, 112
96 EWEB
106 EOEB
108 VCC7
111 ECEB
113 ~ 117
118 VCC4
119 GND4
120 ~ 122
123 ~ 130 ED0 ~ ED7
131 GND5
132 ~ 134
135, 136
FDD CONTROLLER (LSI10:HD63266F)
The FDD (Floppy Disk Drive) controller can control the FDD unit.
The controller contains not only analog VFO (Variable Frequency Oscillator) circuit but also driver/receiver,
input/output port and oscillation circuit internally.
Pin No. Terminal
1 8/ - 5
2 XTALSEL
3 RESET
4 E, -RD
5 R/-W, -WR
6 CS
7 DACK
8, 9 RS0, RS1
10, 11 VSS1, VSS2
12 ~ 19 D0 ~ D7
20 DREQ
21 IRQ
22 DEND
23 VSS3
24 1/2 EX1
25 VCC1
NUM1, NUM2
26, 27, 28
IFS
29 SFORM
In/Out
Not used.
In +5 V source
Out Address bus for the working RAM
Out Write enable signal output for the working RAM
Out Read enable signal output for the working RAM
In +5 V source
Out Chip select signal output for the working RAM
Not used.
In +5 V source
In Ground (0 V) source
Not used.
In/Out Data bus for the working RAM
In Ground (0 V) source
Not used. Connected to ground.
Not used.
In/Out
In Change of data transfer speed.
— Not used. Connected to ground (0 V).
In Reset signal input.
In Read signal.
In Write signal.
In Chip select signal.
In Acknowledge signal of DMA (Direct Memory Access).
In Register selection for read/write.
In Ground terminal (0 V).
In/Out Data bus.
In Request signalof DMA.
— Not used.
In End signal for data transfer.
In Ground terminal (0 V).
— Not used.
In DVDD (5 V) source.
Not used. Connected to ground (0 V).
—
In Selection signal for formatting.
— 16 —
Function
Function