izaya
/
collapseos
mirror of https://github.com/hsoft/collapseos.git
1
0
Fork 0
Code Issues Releases Wiki Activity
collapseos/blk/811

11 lines
386 B
Plaintext
Raw Normal View History

recipes/pcat: first steps into 8086!
2020-06-13 04:01:24 +10:00
H@ ORG ! 0x7c00 BIN( ! ( BIOS loads boot bin at 0x7c00 )
JMP8, L1 FWR8 ( start )
recipes/pcat: now tested on real hardware!
2020-06-14 01:47:32 +10:00
ORG @ 0x25 + HERE ! ( bypass BPB )
recipes/pcat: first steps into 8086!
2020-06-13 04:01:24 +10:00
L1 FSET ( start )
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.
2020-06-14 05:35:16 +10:00
CLI, CLD, AX AX XORxx, DS AX MOVsx, ES AX MOVsx,
SS AX MOVsx, SP 0xffff MOVrI, STI,
pcat: read sector from floppy
2020-06-14 03:29:04 +10:00
AH 2 MOVri, DX 0 MOVrI, CH 0 MOVri, CL 2 MOVri, AL 1 MOVri,
BX 0x8000 MOVrI, 0x13 INT, ( read 2nd sector of boot floppy )
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.
2020-06-14 05:35:16 +10:00
BX JMPr,
recipes/pcat: now tested on real hardware!
2020-06-14 01:47:32 +10:00
ORG @ 0x1fe + HERE ! 0x55 A, 0xaa A,