Re: TED badlines, how do they work?

From: Gerrit Heitsch <>
Date: Fri, 02 Sep 2011 20:43:52 +0200
Message-ID: <>
On 09/02/2011 07:07 PM, Segher Boessenkool wrote:
>>> es, but you already have 2 RAM blocks with their own access control.
>> I doubt we will be able to solve this until we get hi res die shots of
>> TED though. The one available at
>> doesn't help much. There is still a lot of logic visible on it though
>> and TED doesn't have to accomodate sprite logic. So I could imagine a
>> more sofisticated state machine for character and attribute fetches
>> (compared to VIC-II).
>  From that picture, I'm pretty sure it is a single 16x40 RAM.

Looks like that to me too, but TED only has an 8 Bit data bus so there 
must be a way to select upper and lower half of the RAM.

> It seems to the right of it is the X and Y decoders; and to the right
> of that are various registers to do with X and Y (Y on top, X at bottom
> -- 9 resp. 10 bits).

Still, VIC-II had about the same amount of logic but needed a lot of 
space for the sprite logic. Ok, TED also has the sound generator, 
keyboard port and chipset signal generation, but still.


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Received on 2011-09-02 19:00:09

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