Copper-generate WB Backdrop

[trekiej]

I do not know the full capabilities of the custom chips.
So here goes.
1. Use a single bit plane
2. Load the serial-izer with all one's.
3. Rotate them so you would not need to load them any more.
4. Load the colors in to location 1 of the 32 color registers.
5. Time it.
It would be nice if the Ram Address Generator could be programmed to act as a chunky style pixel retriever.

[trekiej]

If the RA Generator thinks it is still retrieving planar info. Maybe the picture could be broken down into planar style layers.
4 planes:  
1, +4 , +4, etc. Pixel 1,5,9,13,etc.
2, +4,  +4, etc.
3, +4
4, +4
I am wondering why a chunky style mode was not added.
I am wondering how to bypass the serial-izer without loosing performance.

[Zac67]

Disk, audio, ... DMA is no problem for copper lists. You can either make it wait until the high priority DMA slots are done (horizontal blanking period) or just live with the MOVE being a few pixels late - while offscreen you won't see anything anyway.

Remember, this is not 'somewhat realtime' register manipulation by the CPU like e.g. on the C64 - the Copper runs 'real realtime' and is accurate to four lores pixels. Running pure copper graphics (just background, no bitplanes) you can effectively use a chunky pixel 'high color' display where the color data is interleaved with MOVE commands.

[trekiej]

How is this going for the poster?
I found this to be interesting.
http://en.wikipedia.org/wiki/Hold_And_Modify