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It is a 2K file consisting of 8 lines of 256 bytes. In a line, each character position is stored on 2 bytes with its attributes. When the Blink builts builds the 640 rows it only reads the 216 first bytes. So up to 108 characters are stored by line. The 40 bytes remaining are used to store windows status and information (see below). The format of these two bytes is like this: 

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In the SBF, the 40 bytes free at the end of each line are used by OZ to store windows and cursor informations. As OZ uses absolute addresses, those data are defined according theyre their address. Each line contains the relative window properties (1-8) and the main data are stored in the last line.

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