It can go in the ULA socket, but it would need to buffer three scan lines.
1st line, buffer data from memory, disable output
2nd line, display first half of line from buffer, whilst buffering and displaying the second
3rd line, display the second copy of the line above whilst buffering the first half of the next line
repeat 2nd and 3rd until end display plus 1 scan line, delaying the display disable for a extra scan line.
I can't see why this couldn't be done with a PiPico but I'm sure it might not be that simple!
Maybe the ULA could plug into the board to allow it to do its thing when not needed if there were things that it couldn;t do like maybe MODE 7!
I remmber Rob saying that buffering a whole line would take up too much room in the FPGA for double buffering a line.
I like the idea of a double height mode 2 with half the memory, but am not sure how well long scan lines would work on all CRTs and wouldn't on LCDs.
The PiRGBtoHDMI could probably do it too, but I'll let someone who knows it comment![;)]( "Wink")
128x128x256 would be good for all those PICO-8 games running on a Pi co-pro![;)]( "Wink")
1st line, buffer data from memory, disable output
2nd line, display first half of line from buffer, whilst buffering and displaying the second
3rd line, display the second copy of the line above whilst buffering the first half of the next line
repeat 2nd and 3rd until end display plus 1 scan line, delaying the display disable for a extra scan line.
I can't see why this couldn't be done with a PiPico but I'm sure it might not be that simple!
Maybe the ULA could plug into the board to allow it to do its thing when not needed if there were things that it couldn;t do like maybe MODE 7!
I remmber Rob saying that buffering a whole line would take up too much room in the FPGA for double buffering a line.
I like the idea of a double height mode 2 with half the memory, but am not sure how well long scan lines would work on all CRTs and wouldn't on LCDs.
The PiRGBtoHDMI could probably do it too, but I'll let someone who knows it comment
128x128x256 would be good for all those PICO-8 games running on a Pi co-pro
Statistics: Posted by tricky — Wed Mar 27, 2024 7:30 pm