collapseos/blk/280
Virgil Dupras da371451cc Replace INITIAL_SP with PS_ADDR conf
Now I struggle to remember why I ever did things they way I did.
There must have been a reason...
2020-05-11 21:08:24 -04:00

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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:
RAMSTART: beginning address of RAM. This is where system
variables are placed. HERE is then placed at RAM+80 (ref B80).
RS_ADDR: to be set to the bottom address of the Return Stack.
PS_ADDR: top address of the Parameter stack (PS grows down-
wards). Allow space for stack underflow protection (B76).
(cont.)