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

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