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Commit Graph

10 Commits

Author SHA1 Message Date
Virgil Dupras
bd508daad9 pcat: begin organizing native words properly
This port is taking shape!
2020-06-18 15:28:30 -04:00
Virgil Dupras
6bc1738bfd pcat: implement (loop)
8086 asm is a lot terser than z80... Those indirect memory operations
are very handy.
2020-06-18 15:01:04 -04:00
Virgil Dupras
bc8144b4be pcat: implement (br) and (br?) 2020-06-16 22:10:32 -04:00
Virgil Dupras
a92864a595 pcat: implement RSP mechanism in execution model 2020-06-16 20:41:53 -04:00
Virgil Dupras
d8d2e05eb2 pcat: make find compare strings
find is the biggest chunk of logic of the boot code. The 8086 version
is significantly terser than the z80 one. REP/CMPS helps...
2020-06-15 06:23:19 -04:00
Virgil Dupras
8c452f5add pcat: begin implementing find
Not comparing strings yet. Without asm tooling support, it's a big
chunk to swallow at once. It's progressing well!
2020-06-14 21:52:58 -04:00
Virgil Dupras
a72322df31 pcat: begin structuring around words 2020-06-14 14:15:44 -04:00
Virgil Dupras
2b7abf802f pcat: begin porting forth
I'm not sure yet where I'm going, but I'm not going to build the
8086 port from the ground up like I did with the z80, that is,
making is sustain itself and eventually merge its forth code with
core words. That would be too much work which would then be thrown
out (all those words I'll initially have to implement in asm which
are already implemented in Forth).

What I *think* I can do is build a mirror version of z80 boot code
and cross-compile it from the z80. This means it has to follow z80
stable ABI.

Nope, I'm not sure where I'm going...
2020-06-13 21:37:54 -04:00
Virgil Dupras
07e50313c7 pcat: separate MBR code and OS code
MBR code now strictly loads OS code into memory and jumps into it.

Now, I've got to consolidate my assembler code, modrm logic is
messed up.
2020-06-13 15:35:16 -04:00
Virgil Dupras
177750c928 recipes/pcat: first steps into 8086! 2020-06-12 14:03:31 -04:00