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b21be43535
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.
16 lines
585 B
Plaintext
16 lines
585 B
Plaintext
Z80 boot code
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This assembles the boot binary. It requires the Z80 assembler
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(B5) and cross compilation setup (B260). It requires some
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constants to be set. See doc/bootstrap.txt for details.
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RESERVED REGISTERS: At all times, IX points to RSP TOS and BC
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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
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before "next".
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The boot binary is loaded in 2 parts. The first part, "decla-
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rations", are loaded after xcomp, before xcomp overrides, with
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"282 LOAD". The rest, after xcomp overrides, with "283 335
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LOADR".
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