collapseos/blk/280

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Z80 boot code
This assembles the boot binary. It requires the Z80 assembler
(B200) and cross compilation setup (B260). It also requires
these constants to be set:
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RAMSTART: beginning address of RAM. This is where system
variables are placed. HERE is then placed at RAM+80 (ref B80).
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RS_ADDR: to be set to the bottom address of the Return Stack.
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PS_ADDR: top address of the Parameter stack (PS grows down-
wards). Allow space for stack underflow protection (B76).
(cont.)