I/O mapped I/O and Memory mapped I/O
Characteristic Memory –Mapped I/O I/O Mapped I/O
Device address 16-Bit 8-Bit
Control signals for
Input and output MEMR* / MEWR* IOR* / IOW*
Instruction available Memory Related instructions IN and OUT
Data Transfer Between any Register and I/O Only between I/O
and the Accumulator
Maximum number of
Input and output
Devices possible 64K 256
Execution speed 13-T states or 7-T states 10 T states
Hardware requirement More Hardware Less Hardware
Other features Arithmetic or logical operations Not available
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