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Changes - CPCWiki
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CRTC

1 byte added, 2 April
/* Overscan bits */
=== Overscan bits ===
It's is possible to use 32KB screen size (used for [[Programming:Overscan|overscan]]) by setting bits 11 and 10 of Register 12 both to 1. Bits MA11 and MA10 of the address generated by the CRTC are not written on the address bus to access video memory; settings both bits to 1 is the only way to cause a carry to bit MA12 when address pass over the end of current video page to change the memory address to the next video page.
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