Spk41q@AOL.COM wrote:
>
> Hello,
>
> Is it possible that 2 or more PIC share one memory?
>
> Perhaps using I2C ?
>
> I think about an aplication needing that :
> -one pic is master - rights to write and read and have priority
> -others PICS are slave just read. no priority
>
> Every things on this subject (pointers, code, opinion...) will be useful.
>
> Have a nice day
> Dan

  There's such a thing as dual ported RAM (usually used with dual
processor micros), doubt you want to play with that here though <G>  It
involves a lot more pins than the 24C series SEEProms!

  What I'm doing on our current project is a redesign for 3 PICs, 1
handles keyboard tasks, 1 handles memory processing, 1 handles interface
to the rest of the world.  You just issue a command to the PIC that
handles the memory, "Look this up", and wait for results.  We chose to
just use 16F84's for ease of re-programming for now (Could do it all
with 1 16C66 but costs are about the same, either way, this way lets me
use the exact same core later for another project - just re-program the
keyboard tasks PIC to handle a different keyboard, everything else is
the same.  And easier for others to program 16F84's - this'll be GPL'ed
once it's done.)

  Just in the start of complete re-design (Lost one PCMCIA hard drive,
so I'll just re-do with what I know now!) - Should find the HD later.
Frustrating, though.  Sure slows me down!

  Mark, mwillis@nwlink.com