53 lines
621 B
NASM
53 lines
621 B
NASM
cpu 8086
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%define seg 0x060
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org 0x7C00 - (seg << 4)
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init: cli
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mov ax, seg
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mov ds, ax
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mov es, ax
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mov ss, ax
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xor sp, sp
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mov ax, sp
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push ax
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.retry: mov ax, 0x0208
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mov cx, 2
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mov dh, 0
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mov bx, 0x100
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int 0x13
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jc .retry
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xor di, di
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mov ax, 0x18CD
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stosw
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int 0x12
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mov cl, 6
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shl ax, cl
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stosw
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mov al, 2
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stosb
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mov ax, 0x18CD
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stosw
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jmp seg:0x100
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times (0x1BE - ($-$$)) db 0
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; assumes 16 heads, 63 sectors per track
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; image of 1.44 MB floppy starting on 2nd track
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part1: db 0x80
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db 1, 1, 0
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db 1
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db 0xFF, 0xFF, 0xFF
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dd 63
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dd 0xb40
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times (0x1FE - ($-$$)) db 0
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; Boot signature
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sig: dw 0xAA55
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