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Double-line mode


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It's not possible to enable double-lines purely through software, but you can double up lines using what I refer to as "mirror ram". The Rescue On Fractalus proto uses this. Basically it's on-cart RAM with one of the address lines permanently set low (or skipped) with the effect that each even numbered RAM page is identical to it's neighbouring odd numbered RAM page.


When you store graphics in this mirror ram area, when Maria pulls the graphical data it will cause duplicate lines (cutting the Y resolution in half) due to the fact that each line of graphics is stored on consecutive pages.

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