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For this reason, the bitmapped video code prepares to prefetch SRAM 16 scan lines be-
fore bitmapped image generation starts. The firmware allocates 320 bytes of the Text
mode video buffer for prefetching the two rows of tiles (in bitmapped mode the text mode
video buffer is free for other uses). The first 8 scans are enough time for most Forth pro-
grams to deselect SRAM at some point (about 35 instructions).
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