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+====== Whirlwind I Vector Interface ======
+This is a preliminary text.
+===== Introduction =====
+To connect a Whirlwind I (WWI) machine (emulated or simulated) to a physical CRT
+not in raster, but in X-Y-Z-mode,
+a hardware interface supports drawing of vectors.
+Single points are drawn as zero-length vectors.
+The board has a dual 12-Bit D/A converter (MCP 4822) controlled by SPI,
+and two digital inputs to set the starting point and to draw a (short) vector
+with a given velocity.
+As a vector is drawn by setting the direction and velocity,
+the destination point is not defined by its absoulte coordinates.
+Although the analog hardware is quite precise,
+the vector size is limited to a fraction of the sceen.
+Thus, long vectors must be composed from shorter ones,
+as to restart at a known location.
+The board can handle two CRT's and lightguns.
+The design was inspired by the Vectrex game console,
+but allows to set a starting point directly.
+==== Design ====
+The interface is essentially an settable integrator
+for X and Y deflection voltages.
+The output of the board provides &plusmn;2.5V on its (analog) output.
+Normal use is as follows:
+- Transmit x and y coordinates of the starting point via SPI to the A/D converter
+- Strobe the 'doMOVE' signal to set initial values of the integrators
+- Transmit x and y values for the speed via SPI
+- Strobe the 'doDRAW' signal to draw the vector with the actually set speed
+==== References ====
+[[https://github.com/raigl/WWI-vecIF]]