Terminal control/Positional read: Difference between revisions
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Amstrad CPC screen memory only stores pixels but no character information (as opposed to e.g. the C64), so the firmware routine (TXT_UNWRITE) called by BASIC works by trying to find a match between screen pixels and the shape of a currently defined character. If the character table or screen pixels in the area of the character are changed between writing and reading, COPYCHR$ will therefore fail.
===[[QuickBASIC#QBasic|QBasic]]===
The top left corner is (1, 1).
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