Providing a game had to deal with 1bpp to 2 bpp conversion, Software Sprites and Scrolling and complicated gameplay, adding some Raster interrupt to the equation is a really bad move and a good way to waste even more CPU time.
[[File:Interrupt_positions_spectrum_sized_screen.png|Screenshot of Amstrad interrupt positions showing where mode and colours can be changed quickly relative to pixel graphics. R1=32, R2=42, R6=24,R7=30]]
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