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  1. BIN( is the addr at which the compiled binary will live. It is

  2. often 0.

  3. 

  4. ORG is H@ offset at which we begin spitting binary. Used to

  5. compute PC. To have a proper PC, call  "H@ ORG !" at the

  6. beginning of your assembly process. PC is H@ - ORG + BIN(.

  7. 

  8. Labels are a convenient way of managing relative jump

  9. calculations. Backward labels are easy. It is only a matter or

  10. recording "HERE" and do subtractions. Forward labels record the

  11. place where we should write the offset, and then when we get to

  12. that point later on, the label records the offset there.

  13. 

  14. To avoid using dict memory in compilation targets, we

  15. pre-declare label variables here, which means we have a limited

  16. number of it. For now, 4 ought to be enough.            (cont.)