Does anyone know where the value of VDP register number 7 is stored?

[greatkreator]

Does anyone know where the value of VDP register number 7 is stored?
Is it possible somehow to do DMA into it?

[Mask of Destiny]

Registers are stored inside the VDP itself and you cannot DMA to them. You can however DMA to CRAM. So you can change the background color by leaving register 7 alone and updating the CRAM entry that it points to. This is how the direct color DMA demos work. You set the autoinc register to 0 so each write goes to the same address and then you just start a large DMA to the background color CRAM address.

[greatkreator]

Thanks Mask! I am of course aware of the direct color trick.
But why am I asking about reg 7? Because I hoped maybe it was possible to do the same with it however without having those 5 doubled-pixel-columns artifacts.