beans computing page

src/beans_computing.gmo

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+# beans computing
+
+digital systems based on manipulating beans according to simple logical rules.
+
+inspired by {the beans computer}, but going at a lower level.
+
+# truth tables
+
+we have only two classes of beans: black (1), and non-black (0).
+
+these tables correspond to the NOT and NOR logical operations.
+
+they show their possible inputs at their left, and their corresponding outputs to the right.
+
+=> ./img/foto_beans-computing_truth-tables.png photo of the NOT and NOR truth tables, composed of beans in a greenish surface
+
+* NOT: the output is the opposite of the input. (table at the top left)
+
+* NOR: the output is black only when none of the inputs are black. in any other case, the output is non-black. (table at the center) {nor}
+
+if you look closely you'll see that NOT can be defined the same way as NOR.
+
+by combining multiple instances of these logic operations, we could build any possible digital behavior.

src/nor.gmo

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 # NOR gate
 
 una de las {compuertas} lógicas más recurrentes en los trabajos de compudanzas.
+
+# truth table
+
+the output is 1 only when none of the inputs are 0.
+
+in any other case, the output is 0.