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Drawing buffer
Display buffer
Double-buffer control
Figure 1-5
Double-Buffering Architecture
Support for EDO Page Mode DRAM: EDO page mode DRAM can be used for the UGM.
This enables the Q2 to use burst access to the UGM and perform high-speed drawing.
Use of Write-Only Drawing: Write-only drawing (a drawing method using only write
operations) is used to improve drawing performance.
1 . 3 . 3
Upgradability
Algorithm Upgrading: In the Q2's drawing system, algorithms for coordinate conversion,
etc., are executed by the SuperH, using a systematized data base containing coordinates and other
data, and the results are represented in graphical form. Thus, the graphics for a variety of shapes
can be implemented simply by upgrading the algorithms, without having to modify the data base
(figure 1-6).
6
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