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This section has 256x8 Memory. It means 256 location of 8 bit each.

When CE-bar=0, IO/M-bar=0 and ALE is activated the address in AD0-AD7 are latched and will be provided to 256 memory location.

A2A1A0Port
000Command/status reg.
001PA
010PB
011PC
100Timer LSB
101Timer MSB

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