Tricks
- Multiple digits can be saved in the same memory cell; each cell can contain 2 or 3 digits.
Set a digit with `dst`; get a digit with `dgt`. To effectively extract the digits, ideally this should be done in a big chip, by putting the data into *dat* and repeatedly move it into *acc*.
- Memory chip is also a great accumulator
- Memory chip's address port can handle values which are bigger than the max address - it'll wrap around.
So you don't need to say `tgt acc 13; +sub 13`
- If the range of *acc* is limited, then the extra range can be used to store a bit.
Say if the value is 0 ~ 200, then we can `sub 400` from it to use -400 ~ -200 to represent the bit = 1, and the original range to represent bit = 0.
