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 >> >> http://plus4world.powweb.com/images/hardware/ted_die.jpg >> >> 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. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2011-09-02 19:00:09
Archive generated by hypermail 2.2.0.
