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* COMMENT -*- mode: org -*-
#+Date: 2017-01-26
Time-stamp: <2017-01-26>
#+STARTUP: content
* notes                                                               :entry:
* later                                                               :entry:
* current                                                             :entry:
** 
** 2017-01-26 make trail persistent
trail is a sized fifo queue, it just store recent 1k entries.
when multiple instances of calculator is working. they all write to a single
trail cache. it's not a problem.

** 2017-01-26 make it work offline, add sw.js
** 2017-01-26 make undo work
** 2017-01-26 make stack auto numbering work
** 2017-01-26 make < (backspace) work.
** 2017-01-26 make basic things work.
- draw the keyboard using HTML and CSS
- make basic number input and arithmetic work
- make DUP and SWP work
- make trail work
* done                                                                :entry:
* wontfix                                                             :entry: