7 Commits

Author	SHA1	Message	Date
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