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+# rp Design Doc
+
+
+## Stages
+
+The plan is to start out rp as a single file prototype, and then, once the basics are in place, start expanding it.
+
+
+### Architechture
+
+The interpter is planned to be a stack-supplied state machine, such that all of the input states are stored on the interpreter struct. This is so that key-by-key commands can be handled directly by the interpreter, at least at first. (If this proves to be -too- complicated to implement, an input editor might be investigated, but I feel confident so far)
+
+Eventually, there will be a TUI display. This I hope to write as a function of an immutable borrow of the stack machine.
+
+
+### Mockups
+
+
+Main screen, shown all of the time
+```
+/---------------------------\
+|  0.#: 123                 |
+|  1.#: 456                 |
+| >2.#: 789_                |
+|  3.$: [This is a string]  |
+|                           |
+| C-h: Help                 |
+| C-r: Registers            |
+| _: Change Sign            |
+\---------------------------/
+```
+
+
+Registers screen, shown in slot two if enabled
+
+```
+/--------------------------\
+| Registers:               |
+| a.@: {1,[abc], 2}        |
+| b.#: 3                   |
+| c.$: [This is a string]  |
+| i.$: [1+]                |
+| g.F: f(x)=[x 1 +]        |
+|                          |
+\--------------------------/
+```
+
+Help screen, shown below any other screens, if enabled
+
+```
+/--------------------------\
+| Help:                    |
+| 1: Arithmetic            |
+| 2: Trig                  |
+| 3: Graphing              |
+| 4: Search                |
+| q: Exit Help             |
+|                          |
+\--------------------------/
+
+```
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