Re: Norma; 'boot sequence' for a CPU?

uvcceet_at_juno.com
Date: 10/29/04 

Date: Fri, 29 Oct 2004 11:04:05 -0600

>>> Let's take a Z80 for example - when a board with a Z80 (and relevant
>>> RAM, ROM and support chips) is powered on, what is the sequence of
>>> events that takes place?
>>
>>It starts running, reading the first RAM memory address.
>>

Following a reset, the Z80 will go to address 0000 and begin to execute that
code. If its RAM, its a problem :-) The EPROM will be mapped to that address.
In the early days of 8 and 16 bit CPUs, the restart address was often 0000,
but some, like Motorola start at the highest memory address. Where that
address is on the newest generation, I don't know for sure, but I would
venture a guess that the Intel family goes to 0000 and Motorola goes to the
highest address. Its hard to teach old dogs new tricks. :-)

John