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collapseos/blk/280

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Z80 boot code
This assembles the boot binary. It requires the Z80 assembler
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(B200) and cross compilation setup (B260). It requires some
constants to be set. See B420 for details.
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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
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in native code. you just have to make sure you've restored it
before "next".
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The boot binary is loaded in 2 parts. The first part, "decla-
rations", are loaded after xcomp, before xcomp overrides, with
"282 LOAD". The rest, after xcomp overrides, with "283 335
LOADR".