Re: 6809 in a C64

From: Jim Brain <*brain_at_jbrain.com*> Date: Thu, 24 May 2018 01:24:18 -0500 Message-ID: <f1c727db-918a-d59e-7845-426f01c693a5@jbrain.com> · brain_at_jbrain.com

On 5/24/2018 1:19 AM, Baltissen, GJPAA (Ruud) wrote:
> Hallo Jim,
>
>> but why pull a perfectly good Z80 out of the C128 when one can hang the 6809 off the cart port?
> I rather prefer to have a 6809 on board than the Z80 but my main reason: it would free the expansion port so I will be able to use other cartridges.
I think it's going to be tough to pull the Z80.  Bil Herd notes in his 
stories that the C128 bootup relies on the Z80 pulling startup vectors 
from low memory to handle carts like Magic Voice that play with the 
control signals when 6502 vectors are pulled.

Ruud, I need to send you a cartridge expander.  :-)

Jim