78 lines
899 B
NASM
78 lines
899 B
NASM
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; Memory layout:
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%define self 0x00600 ; 1 sector
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%define prog 0x07C00 ; 1 sector
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org self
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cpu 8086
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init:
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cli
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; Stack grows down from PSP + 64k
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xor ax, ax
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mov ss, ax
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mov sp, ax
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push dx
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; Relocate from [prog] to [self]
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mov ds, ax
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mov es, ax
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mov si, prog
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mov di, self
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mov cx, 0x100
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rep movsw
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jmp 0:main
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main:
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mov bp, 0x0035
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mov WORD [dap.blocknum], 1
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mov si, dap
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mov ah, 0x42
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stc
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int 0x13
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jc error
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mov cx, [dap.blocknum]
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int3
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error:
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mov ax, bp
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mov ah, 0x0e
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mov bx, 7
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int 0x10
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mov al, 0x21
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int 0x10
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xor ax, ax
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int 0x16
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int 0x19
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dap:
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.size:
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db 0
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db 0
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.count:
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dw 1
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.buffer:
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dw prog
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dw 0
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.blocknum:
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dq 0
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times (0x1BE - ($-$$)) db 0
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part1:
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db 0x80
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.chs_start:
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db 0xFF, 0xFF, 0xFF
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.type:
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db 0x01
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.chs_end:
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db 0xFF, 0xFF, 0xFF
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.begin:
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dd 1
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.end:
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dd (FLOPPY * 2)
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times (0x1FE - ($-$$)) db 0
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dw 0xAA55
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