Casio WK-1800, Service Manual

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