SO SIM­PLE AN AP­PLE COULD DO IT!

PCPOWERPLAY - - OBJECTS IN SPACE -

Now, it might not be the done thing to quote Wikipedia in a proper mag­a­zine that gets printed on pa­per and ev­ery­thing, but this para­graph ex­plain­ing how the Ap­ple II could do colour is just too amaz­ing not to cel­e­brate: The Ap­ple II dis­play pro­vides two pix­els per sub­car­rier cy­cle. When the colour burst ref­er­ence sig­nal is turned on and the com­puter at­tached to a colour dis­play, it can dis­play green by show­ing one al­ter­nat­ing pat­tern of pix­els, ma­genta with an op­po­site pat­tern of al­ter­nat­ing pix­els, and white by plac­ing two pix­els next to each other. Blue and or­ange are avail­able by tweak­ing the off­set of the pix­els by half a pixel-width in re­la­tion to the colour-burst sig­nal. The high­res­o­lu­tion dis­play of­fers more colours by com­press­ing more (and nar­rower) pix­els into each sub­car­rier cy­cle.

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