question in 8086/8088

Thread Starter

Embedded Lover

Joined Dec 22, 2008
26
Hello every body , i read this statement which i cant understand ,

In an 8088/8086 the high addresses in the

memory map should always be occupied by a

ROM, while the low addresses in the

memory map should always be occupied by a

RAM.

why ?
 

beenthere

Joined Apr 20, 2004
15,819
It pretty well worked that way for the old 8 bit microprocessors. The power on sequence loads the last 2 bytes of memory (FFFE & FFFF) into the address register as a jump vector. If you don't have ROM present, then nobody's home and the processor won't boot or start the process running.
 
Top