Re: More CPLD explorations

From: Groepaz <groepaz_at_gmx.net>
Date: Tue, 25 Feb 2014 18:43:11 +0100
Message-Id: <201402251843.11554.groepaz@gmx.net>
On Tuesday 25 February 2014, you wrote:
> On 02/25/2014 06:07 PM, silverdr@wfmh.org.pl wrote:
> > On 2014-02-25 at 17:10:54, Gerrit Heitsch (gerrit@laosinh.s.bawue.de) 
wrote:
> >>>>> maybe one where the VIC does never see chargen (but always
> >> 
> >> RAM instead)?
> >> 
> >>>>> that would be very nice for graphic effects :)
> >>>> 
> >>>> So, Bank 1/3 doesn't work? I thought in those banks, charrom
> >> 
> >> is gone...
> >> 
> >>> err yes. thats why i said "the VIC does never see chargen". that
> >> 
> >> obviously
> >> 
> >>> means it is always gone, in all banks. that gives additional
> >> 
> >> 8k of memory to
> >> 
> >>> use for gfx.
> >> 
> >> Of course, you have to make sure that VIC sees the Char-ROM at power
> >> on, otherwise using the C64 will become complicated.
> > 
> > I believe the idea is that one can get /additional/ configurations but
> > the default remains valid.
> 
> Then the interesting part is how to switch between them without breaking
> compatibility to existing Software in plain C64 mode. The dilemma the
> C128 designers already faced and _almost_ solved.

i'd just use a wire and a switch - since you cant make it 100% compatible 
anyway, and programs exploiting it will not run on unmodified machine either, 
you can just aswell manually enable it.

-- 

http://www.hitmen-console.org    http://magicdisk.untergrund.net
http://www.pokefinder.org        http://ftp.pokefinder.org

Das Licht am Ende des Tunnels koennte auch der Gegenzug sein.


       Message was sent through the cbm-hackers mailing list
Received on 2014-02-25 18:01:36

Archive generated by hypermail 2.2.0.