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collapseos
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Mirror of CollapseOS
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collapseos/arch/8086/pcat/blk/602

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  1. H@ ORG ! 0x7c00 BIN( ! ( BIOS loads boot bin at 0x7c00 )

  2. JMPs, L1 FWRs ( start )

  3. ORG @ 0x25 + HERE ! ( bypass BPB )

  4. L1 FSET ( start )

  5. CLI, CLD, AX 0x800 MOVxI, DS AX MOVsx, ES AX MOVsx,

  6. SS AX MOVsx, DX PUSHx, ( will be popped by OS ) STI,

  7. AH 2 MOVri, DH 0 MOVri, CH 0 MOVri, CL 2 MOVri, AL 15 MOVri,

  8. BX 0 MOVxI, 0x13 INT, ( read sectors 2-15 of boot floppy )

  9. ( TODO: reading 12 sectors like this probably doesn't work

  10.   on real vintage PC/AT with floppy. Make this more robust. )

  11. 0x800 0 JMPf,

  12. ORG @ 0x1fe + HERE ! 0x55 A, 0xaa A,