On Tue, 29 May 2001, Dylan Hillier wrote:

> <sorry, forgot to put a subject.. haaahaahaha.>
>
  don't laugh please, James will be angry...


>
> Im hoping to use a PIC16F84A to do this with PortA as the address/control
> bus and port B as the data bus.
> I would like to ability to control up to 8 devices using the bus by simlpy
> connecting them to the bus, much the same way as you would with an Device
> Card in an ISA bus on a 'old school' PC.
>
  Prototype reserved area for standard PC is 300H...31FH.
You need some requirements:
-- highZ for data signals
-- address decoding pins, I think you can't do a full decode selection
   only with porta
-- WR and RD signals
-- no interrupts ?
-- ISA bus frequency less than 8MHz ( available in old PC ) or a good
software and 40Mhz pic

I think there are other pic microcontrollers which will fit better your
requirements.

Vasile

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.