Hitachi AP1 Data Book page 261

4-bit single-chip microcomputer
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R9'
Rs,
R.o/
R.,I R421
SCKSI
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RAM
576x4bit
Rll/
Rl2/
INT,
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INTERRUPT
RESET
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EPROM
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HN482764 ]
HN27C64
HN4827128
PC
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