© Thomas Kunz 2000
SCE 574
72
   8088
äBus interface
ä8 bit data bus
ä20 bit address bus, each byte in memory is accessible
ä16 bit registers
äPoints to a byte, can be used to point to words of 2 bytes as well, need to decide on order of bytes for 2 byte words
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äHow do the 16 bit registers work with 20 bit addresses? We will take a look soon....
äControl bus, beyond the scope of this course
Low
High
High
Low
Little
Endian,
this is the
format on the
8088 processors
Big
Endian
Address i
Address i + 1
High = msb, most
significant byte
Low = lsb, least
significant byte