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  • Blitter and Line Draw

    Posted on September 9th, 2008 Phil

    Still adding new features to the V5Z80P.. :) Latest additions are a VGA-like 1byte=1pixel screen mode, with hardware line draw.. I’ve also allowed the blitter to skip writes of zero pixels which means it can do “bobs” (ie: software sprites). As you can see on the pic to the right it can manage 192 16×16 pixel bobs in one frame. The linedraw test below is showing 127 lines (double buffered display, with line erase) with plenty of frame time left for more.

    Helping with the new video mode is a new video addressing system where you can choose to send all CPU writes to video RAM. There is an optional exclusion window so stack operations can still occur whilst the large video page is active.


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