Intel 8086 Architecture

Srinivasa Ramanujan Centre

SASTRA University

BHE – Bus High Enable signal from 8086

A0 – LSB of Address Bus – toggles for even / odd access

8-bit memory chips were only available on market, 8086 is a 16bit processor

BHE A00 0 Whole word (16 bits – 2 bytes)0 1 Upper byte from an odd address1 0 Lower byte from an even address1 1 None

2 Banks - 512k each – called odd bank and even bank

Reserved memory address – FFFF0h – FFFFFh(Init), 00000h – 3FFFFh (IVT)