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| 1 | ;Copyright (C) 2008 by Mattia Monga <mattia.monga@unimi.it>
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| 2 | bits 16 ; 16 bit real mode
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| 3 | org 0x7C00 ; origine indirizzo 0000:7C00
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| 4 |
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| 5 | start:
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| 6 | cld ; clears direction flag (index regs incremented)
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| 7 | mov si, boot
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| 8 | call message
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| 9 | working:
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| 10 | mov si, work
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| 11 | call message
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| 12 |
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| 13 | call waitenter
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| 14 | jmp working
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| 15 |
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| 16 | message:
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| 17 | lodsb ; carica un byte da [DS:SI] in AL e inc SI
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| 18 | cmp al, 0
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| 19 | jz done
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| 20 | mov ah, 0x0E ; write char to screen in text mode
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| 21 | mov bx, 0 ; BH page number BL foreground color
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| 22 | int 0x10 ; write AL to screen (BIOS)
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| 23 | jmp message
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| 24 | done: ret
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| 25 |
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| 26 | boot: db "Loading unuseful system...." , 10, 13, 0
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| 27 | work: db "I've done my unuseful stuff!" , 10, 13, 0
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| 28 | cont: db "Hit ENTER to continue...", 10, 13, 0
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| 29 | wow: db "Great! Hello world!" , 10, 13, 0
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| 30 |
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| 31 | waitenter: mov si, cont
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| 32 | call message
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| 33 | mov ah, 0
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| 34 | int 0x16 ; Wait for keypress (BIOS)
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| 35 | cmp al, 'm'
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| 36 | jz egg
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| 37 | cmp al, 'b'
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| 38 | jz basic
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| 39 | cmp al, 13
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| 40 | jnz waitenter
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| 41 | ret
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| 42 | egg: mov si, wow
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| 43 | call message
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| 44 | jmp waitenter
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| 45 | basic: int 0x18 ; basic (BIOS)
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| 46 | hlt
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| 47 |
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| 48 | times 510-($-$$) db 0
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| 49 | dw 0xAA55
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