Intel 8086 Architecture Class Presentation

Intel 8086 Architecture Srinivasa Ramanujan Centre SASTRA University

8-bit memory chips were only available on market, 8086 is a 16bit processor BHE – Bus High Enable signal from 8086 A0 – LSB of Address Bus – toggles for even / odd access 2 Banks - 512k each – called odd bank and even bank Reserved memory address – FFFF0h – FFFFFh(Init), 00000h – 3FFFFh (IVT) BHE 0 0 1 1

A0 0 1 0 1

Whole word (16 bits – 2 bytes) Upper byte from an odd address Lower byte from an even address None