RE: [N8VEM: 5601] 6809 bus design

["Andrew Lynch" <lyn...@yahoo.com>]

Hi Bill!  I would very much like to do this but how do we have both the Z80
SBC and the 6809 on the ECB as "bus masters" at the same time?  I think it
would require a redesign of the 6809 computer and maybe the Z80 SBC too.

I think the "host processor" approach works for multiprocessing however it
is *far* from an optimum solution.  Basically the Z80 is reduced to an IO
processor for the 6809.  I recall some builders were working on 8088 style
SBCs and I am hoping some new ideas will come out as to how to allow
multiple SBCs to have control of the ECB.

Thanks and have a nice day!

Andrew Lynch

> -----Original Message-----
> From: Bill Beech (NJ7P) [mailto:nj...@nj7p.org]
> Sent: Thursday, November 26, 2009 3:01 PM
> To: n8...@googlegroups.com
> Subject: Re: [N8VEM: 5601] 6809 bus design
> 
> Michael,
> 
> I am with you.  I use 6821's for parallel ports on my S-100 (8085/8088
> cpu card) with no problem.  I have also used intel peripheral chips with
> the 6800/6809.  Why not interface it so we can use the disk controller
> directly?
> 
> Bill
> 
> Michael Haardt wrote:
> >> My plan is to make a bus similar to the ECB but for the 6809 CPU.
> >>
> >
> > Why not just ECB? The NDR-Klein-Computer had a 68008 CPU card on the
> > standard bus, which is pretty much like ECB, just with different pinout,
> > so it is possible.  I recall people using 6522 on Z80 systems, you only
> > need to synchronise accesses using /WAIT.
> >
> > Michael
> >
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