ULA

Graph

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Permit vertical scrolling by amounts smaller than a character row.
Fixed the screen size calculation for modes employing line spacing.
Added spacing between character rows and fixed the number of rows in the modes involved.
Changed the program architecture to involve an external screen update loop
Added a module which simulates the video functions of the Acorn Electron ULA.
Some documentation of the Acorn Electron ULA and discussion of potential enhancements.
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