> * Each device is hooked onto the address/data bus lines from the CPU
> * When the device recognises an address in it's range on these lines, it
> performs a read (and puts the data on the data bus) or write (data bus ->
> internal register / RAM / etc)

That's the basics.

> If this is so, how easy would it be to attach say any old parallel EEPROM?
> How would you assign it an address range?  Would you recognise an
> appropriate pattern in the 8 upper bits, if it was correct for the EEPROM,
> feed the bus lines to the EEPROM (use the lower 24 bits of the address bus
> to specify the address for the EEPROM access)?

Basically yes.  There are usually a few more bus details like timing and
handshaking.  Also, you are asking for a 16Mb address window.  You have to
make sure no other device responds to any address with the same combination
of high 8 bits.


*****************************************************************
Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu