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Block Diagram - Casio I/O-PB-12 Service Manual

Electronic cash register option i/o board for casio ce-4700; casio tk-1300; casio tk-2300; casio tk-2700; casio tk-5100
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4. CIRCUIT EXPLANATIONS

4-1. Block diagram

ISA Bus
84pin J-Lead
4-2. ISA bus
PLD
EPM7064
LC92011B-630
Pin
Signal
A01
NC
A02
SD7
A03
SD6
A04
SD5
A05
SD4
A06
SD3
A07
SD2
A08
SD1
A09
SD0
A10
IOCHRDY
A11
AEN
A12
NC
A13
NC
A14
NC
A15
NC
A16
NC
A17
NC
A18
NC
A19
NC
A20
NC
A21
NC
A22
SA09
A23
SA08
A24
SA07
A25
SA06
A26
SA05
A27
SA04
A28
SA03
A29
SA02
A30
SA01
A31
SA00
CPU
HD63B03YP
64pin DIP
GA
80pin FP
SRAM
CXK581000P-10L
32pin DIP
ARCNET
COM20020BP
24pin DIP
Pin
Signal
B01
GND
B02
RESETDRV
B03
+5V
B04
NC
B05
NC
B06
NC
B07
-12V
B08
NC
B09
+12V
B10
GND
B11
NC
B12
NC
B13
IOW
B14
IOR
B15
NC
B16
NC
B17
NC
B18
NC
B19
NC
B20
NC
B21
IRQ7
B22
NC
B23
IRQ5
B24
IRQ4
B25
IRQ3
B26
NC
B27
NC
B28
BALE
B29
+5V
B30
NC
B31
GND
— 7 —
Driver
KP In-line
Receiver
EPROM
TM27C010A-12JL
32pin DIP
Driver
C in-line
Receiver

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Ex-i/o-pb-12