Re: More CPLD explorations

From: Gerrit Heitsch <>
Date: Tue, 25 Feb 2014 18:27:35 +0100
Message-ID: <>
On 02/25/2014 06:07 PM, wrote:
> On 2014-02-25 at 17:10:54, Gerrit Heitsch ( 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.


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Received on 2014-02-25 18:01:05

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