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1a467efae1
Unless I misunderstood, this is supposed to set CS. This would make all SREG have the same value. This allows us to remove BIN( offset from os.bin. I've tried booting to offset 0, but it didn't seem to work. Let's settle for 0x8000. 512kb of system RAM is way more than we need anyways.
11 lines
389 B
Plaintext
11 lines
389 B
Plaintext
H@ ORG ! 0x7c00 BIN( ! ( BIOS loads boot bin at 0x7c00 )
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JMPs, L1 FWRs ( start )
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ORG @ 0x25 + HERE ! ( bypass BPB )
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L1 FSET ( start )
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CLI, CLD, AX 0x800 MOVxi, DS AX MOVsx, ES AX MOVsx,
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SS AX MOVsx, SP 0xffff MOVxi, STI,
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AH 2 MOVri, DX 0 MOVxi, CH 0 MOVri, CL 2 MOVri, AL 1 MOVri,
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BX 0 MOVxi, 0x13 INT, ( read 2nd sector of boot floppy )
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0x800 0 JMPf,
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ORG @ 0x1fe + HERE ! 0x55 A, 0xaa A,
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