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diff --git a/fx/README.md b/fx/README.md index 746e922..e7194dc 100644 --- a/fx/README.md +++ b/fx/README.md @@ -1,4 +1,12 @@ -TBD +## Effects by bank switching on CHR-ROM -- Animating through CHR bank switching (a la Megaman 5 with MMC3) -- Shrinking a sprite rendered through CHR-RAM +Some games like Megaman 5/6 performed some subtle background effects by +performing bank switching on the PPU thanks to the capabilities of the MMC3. +That is, the trick is to devote at least two similar 1KB chunks where one +contains a subtly changed version of the other. This way, you can simply perform +a periodic bank switch and the PPU will render subtly different things every +time, without the CPU having to dedicate any resources on changing any values on +the data. + +A very simple example is provided in [blink.s](./blink.s) where a character +blinks periodically. |