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collapseos/blk/280
Virgil Dupras b21be43535 Move 8086 assembler from B730 to B30
Also, move doc to doc/asm.txt.

Also, fix the pcat recipe which was broken since the overlay change.
I hadn't noticed it because I didn't have to rebuild the MBR.
2020-09-21 19:24:54 -04:00

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Z80 boot code
This assembles the boot binary. It requires the Z80 assembler
(B5) and cross compilation setup (B260). It requires some
constants to be set. See doc/bootstrap.txt 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".
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".