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Synchronising with the CRTC and display

5 bytes added, 06:51, 14 June 2008
* Synchronising using the VSYNC
The [[VSYNC]] signal of the CRTC is connected directly to [[8255|PPI]] port B, therefore it is possible to test the state of the VSYNC.
It is possible to synchronise to the start of the VSYNC using the following code: e.g.
CPCLER
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