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=== Registers === * [[MMIO registers]]

...h [[MMIO registers#NMITIMEN|NMITIMEN]] bit 7 while the vblank flag ([[MMIO registers#RDNMI|RDNMI]] bit 7) is set, an NMI will trigger immediately. This can caus * [[PPU registers#INIDISP|INIDISP]] (register $2100) problems

...ins anything in the $2100-$21FF range, including [[PPU registers]] and APU registers). These buses use the same data bus, and DMA works by having a read on one ...the background and can be set up to automatically write values to hardware registers at specific scanlines, allowing for effects.