Re: C-128 and Jeri board

From: Jeri Ellsworth (
Date: 2001-05-01 15:30:25


> There is alot of speculation about whether the board
> will be compatible with the C-128. Have you done any
> testing to see whether it works, even if only in
> C-64
> mode?

  I have not tested the board on a 128, but I have
been trying to keep the interface simple and use only
signals that would appear on both machines.  I will
need the capability to "shut up" certain chips on the
host machine so my card can respond in there place. 
This may be more of a challenge in the 128 and require
more soldering.
> As I see it, the only thing that would get in your
> way
> would be the C-128 MMU. Is there anything else that
> might prevent C-64 mode operation?

The decoding that the MMU does is a potential problem
> If the board can be made to function in C-64 mode on
> the C-128, there will be no real use for the C-128
> mode other than to run legacy C-128 apps. For that
> reason, 

I think it would be sufficient to provide a
> disable function which should cause your board to
> 'disappear' and hand the system back to the original
> C-128 hardware. That would eliminate the need to
> emulate all the C-128 specific logic on your board.
Of course.  A disable is a must.

I'm curious how many people would be interested in an
entire motherboard replacement instead?  Maybe with
the option to plug original chips into it?


PS Some one has subscribed my web page to
"" and it is flooding my mail with
spam.  Anyone know how to stop it?

Do You Yahoo!?
Yahoo! Auctions - buy the things you want at great prices
This message was sent through the cbm-hackers mailing list.
To unsubscribe: echo unsubscribe | mail

Archive generated by hypermail 2.1.1.