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- Z80 boot code
-
- This assembles the boot binary. It requires the Z80 assembler
- (B200) and cross compilation setup (B260). It requires some
- constants to be set. See B420 for details.
-
- RESERVED REGISTERS: At all times, IX points to RSP TOS and BC
- is IP. SP points to PSP TOS, but you can still use the stack
- in native code. you just have to make sure you've restored it
- before "next".
-
- STABLE ABI: The boot binary starts with a list of references.
- The address of these references have to stay to those addr-
- esses. The rest of the Collapse OS code depend on it. In fact,
- up until 0x67, the (?br) wordref, pretty much everything has
- to stay put. (cont.)
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