Maybe a bit relevant to CPC sometimes, or other platforms, but I started a series of videos where I am trying to explain and experiment with crazy oldschool optimizations.
In this latest video I might try something on DOS as continuation from previous videos, but later in the middle I show some never seen before Z80 CPC source code from A Step Beyond and try to explain the assembly unrolling optimizations for plasma, fire effect and also the polar plasma from x-kore. It's a bit long and lousy, mostly explaining my passion with extreme oldschool optimizations, but you see a lot of nice extra CPC previews (or variations of effects I already have released).