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pascal@13691
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1 .text
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pascal@13691
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2 .code16
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pascal@13691
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3 .org 0
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pascal@13691
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4
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pascal@13691
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5 CODESZ = 0x8000 // 16 sectors = 32Kb
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pascal@13972
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6 #define EXEADRS(x) x+0xC0
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pascal@14261
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7 #define EXELOC(x) x-0x40
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pascal@14261
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8 #define EXESTR(x) x-0x7F40
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pascal@13691
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9
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pascal@13691
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10 .globl _start
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pascal@13691
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11 _start:
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pascal@13691
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12 decw %bp // Magic number: MZ
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pascal@13691
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13 popw %dx
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pascal@13972
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14 jmp start0 // Bytes on last page of file
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pascal@13691
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15 .word (CODESZ+511)/512 // Pages in file
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pascal@13691
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16 .word 0 // Relocations
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pascal@13691
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17 .word (end_header-_start)/16 // Size of header in paragraphs
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pascal@13691
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18 .word 4064-(CODESZ/16) // Minimum extra paragraphs needed
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pascal@13691
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19 .word 4064-(CODESZ/16) // Maximum extra paragraphs needed
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pascal@13691
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20 .word 0xFFF0 // Initial (relative) SS value
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pascal@13691
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21 .word 0xFFFE // Initial SP value
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pascal@13691
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22 .word 0 // Checksum
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pascal@13729
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23 .word EXEADRS(exestart) // Initial IP value
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pascal@13691
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24 .word 0xFFF0 // Initial (relative) CS value
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pascal@13972
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25 initramfssize:
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pascal@13972
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26 .word 0 // File address of relocation table
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pascal@17810
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27 fdcnt: // Overlay number
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pascal@14257
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28 .byte 0 // Bootstrap floppy sector count
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pascal@17810
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29 .ascii "slitaz"
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pascal@13691
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30
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pascal@13691
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31 /////////////////////// Master Boot Record code //////////////////////////////
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pascal@13691
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32
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pascal@17810
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33 moved = 0x8000
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pascal@17496
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34 start0:
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pascal@17496
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35 pushw %dx // restore %sp
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pascal@13972
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36 incw %bp // restore %bp
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pascal@17496
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37 xorw %bx, %bx
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pascal@17496
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38 movw %bx, %ds
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pascal@17496
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39 movb $0x7C, %bh
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pascal@17496
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40 pushw %bx // return address
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pascal@13691
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41 pushaw
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pascal@13691
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42 movw %sp, %bp
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pascal@17496
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43 pushw %es // save %es:%di
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pascal@13972
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44 cld
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pascal@17496
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45 sti
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pascal@13972
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46 pushw %ds
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pascal@13972
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47 popw %es
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pascal@13691
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48 call setreg
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pascal@13691
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49 rep
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pascal@13691
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50 movsw
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pascal@13972
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51 movw $0x80, %dx
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pascal@17810
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52 ljmp $0, $moved+start2
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pascal@17810
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53 .byte 0
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pascal@17810
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54 // .org 60
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pascal@17810
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55 // .long 0x0080 // PE header offset
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pascal@17810
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56 .org 64
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pascal@13972
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57 end_header:
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pascal@13972
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58 comstart:
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pascal@13972
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59 .word 0
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pascal@13691
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60
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pascal@17810
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61 .org 66
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pascal@17810
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62 dxloop:
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pascal@17810
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63 start2:
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pascal@17810
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64 call readsector1 // look for the boot device
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pascal@17810
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65 repe
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pascal@17810
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66 cmpsw
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pascal@17810
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67 je dxfound
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pascal@17810
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68 movb $0, %cl // ch = 0
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pascal@17810
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69 addb $0x7D, %dl // try every hard disk
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pascal@17810
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70 jno dxloop
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pascal@17810
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71
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pascal@17810
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72 dxfound:
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pascal@17810
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73 call readsectorX // read isolinux boot sector
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pascal@17810
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74 movw %dx, 10(%bp)
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pascal@17810
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75 cmpw (%bx), %cx
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pascal@17810
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76 jnc puts // read fail or no isohydrid boot sector
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pascal@17810
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77 popw %es
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pascal@17906
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78 popa // isolinux boot needs %es:%di and %dx
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pascal@17810
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79 putsret:
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pascal@17810
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80 ret
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pascal@17810
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81
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pascal@17810
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82 putstrlp:
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pascal@17810
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83 movw $7, %bx
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pascal@17810
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84 movb $0xE, %ah
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pascal@17810
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85 int $0x10
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pascal@17810
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86 error:
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pascal@17810
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87 lodsb
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pascal@17810
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88 cmp $1, %al
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pascal@17810
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89 jg putstrlp
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pascal@17810
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90 jz putsret
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pascal@17810
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91 puts:
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pascal@17810
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92 movb $0x80, %ah
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pascal@17810
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93 xchgw %ax, %si
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pascal@17810
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94 jnc error
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pascal@17810
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95 halt:
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pascal@17810
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96 hlt
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pascal@17810
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97 jmp halt
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pascal@17810
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98 nobsmsg:
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pascal@17810
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99 .asciz "No isolinux."
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pascal@17810
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100
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pascal@17810
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101 .org 0x0080
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pascal@17810
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102 ////////////////////////////// EXE/PE header //////////////////////////////////
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pascal@17810
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103
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pascal@17810
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104 .org 0x01A0
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pascal@17496
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105 readsectorX: // read isolinux boot sector
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pascal@17496
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106 movb $0xA5, %cl // patched by installer
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pascal@13699
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107 readsector1:
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pascal@17496
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108 andb $0x83, %dl // disk and floppy disk
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pascal@13699
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109 movw %cx, (%bx)
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pascal@13699
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110 incw %cx
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pascal@13699
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111 movw $0x201, %ax
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pascal@13699
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112 int $0x13
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pascal@13691
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113 setreg:
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pascal@13699
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114 movw %bx, %si
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pascal@17810
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115 movw $moved, %di
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pascal@13691
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116 movw $0x0100, %cx
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pascal@17810
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117 movb $nobsmsg, %al
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pascal@13691
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118 ret
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pascal@17810
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119 .org 0x01B8
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pascal@14267
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120
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pascal@17810
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121 .org 0x7F48
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pascal@13691
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122 ////////////////////////////// DOS EXE code ///////////////////////////////////
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pascal@13691
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123
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pascal@13729
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124 exestart:
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pascal@13699
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125 cld
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pascal@17810
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126 movw 129, %ax
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pascal@17473
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127 cmpb $0x2F, %al
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pascal@17473
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128 je ishelp
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pascal@17473
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129 cmpw $0x2F20, %ax
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pascal@17473
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130 ishelp:
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pascal@17473
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131 movw $0x3000+EXESTR(help), %ax
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pascal@13729
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132 cwd // clear dx
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pascal@17454
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133 pushw %dx // dos exit()
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pascal@17454
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134 je abort
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pascal@17454
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135 int $0x21 // get DOS version
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pascal@17562
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136 addb $-3, %al
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pascal@17810
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137 movw $0x1000+EXESTR(noDOS3), %ax
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pascal@17810
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138 jc tst386
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pascal@13691
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139 abort:
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pascal@17810
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140 jmp puts
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pascal@13691
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141
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pascal@17160
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142 tst386:
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pascal@17906
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143 pushfw // save flags
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pascal@17160
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144 // bits 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
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pascal@17160
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145 // flags 0 NT IOPL OF DF IF TF SF ZF 0 AF 0 PF 1 CF
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pascal@17160
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146 // movb $0x10, %ah
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pascal@17160
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147 pushw %ax
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pascal@17906
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148 popfw // < 286 : flags[12..15] are forced 1
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pascal@17906
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149 pushfw // = 286 : flags[12..15] are forced 0
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pascal@17906
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150 popw %bx // > 286 : only flags[15] is forced 0
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pascal@17906
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151 popfw // restore flags (IOPL)
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pascal@17906
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152 addb %ah, %bh // test F0 and 00 cases
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pascal@17160
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153 cmpb %ah, %bh
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pascal@17810
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154 movw $0x100, %di
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pascal@17906
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155 jbe is86 // C=8086/80186, Z=80286
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pascal@13691
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156 is386:
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pascal@17906
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157 smsww %ax // not privileged
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pascal@13691
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158 andb $1, %al
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pascal@17562
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159 movw $10, %si
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pascal@13691
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160 jne tstvcpi
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pascal@17906
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161 movl %cr0, %eax // privileged
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pascal@14150
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162 incl %eax
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pascal@13713
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163 movb $EXESTR(rmPaging), %al
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pascal@14150
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164 js abort
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pascal@17810
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165 inc %ax
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pascal@17810
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166 //movb $EXESTR(realmodemsg), %al
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pascal@13691
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167 realmode:
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pascal@17810
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168 call puts
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pascal@17160
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169 is86:
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pascal@14261
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170 movw comstart-end_header(%di), %si // .com address
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pascal@13691
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171 pushw %di
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pascal@17906
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172 movb $0x7C/2, %ch // 31K-31.5K, > com length
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pascal@13691
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173 rep
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pascal@17473
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174 movsw
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pascal@13691
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175 ret
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pascal@13713
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176
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pascal@13713
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177 VersionVCPI:
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pascal@17496
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178 xchgw %ax, %si // movb $EXESTR(vm86modemsg), %al
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pascal@17562
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179 cmpb $0x40, %cl // EMM386 / VCPI 4.0 mini
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pascal@17562
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180 jnc realmode // %si = 0
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pascal@13713
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181 tstvcpi:
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pascal@13713
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182 pushw %ds
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pascal@17810
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183 movw %si, %ds // %si = 10
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pascal@17810
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184 movw (0x67*4)+2-(16*10)-0x100(%di), %ds
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pascal@17473
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185 lodsw
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pascal@13713
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186 xorw $0x4D45, %ax // EM(MX) or EM(MQ)
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pascal@17473
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187 lodsw
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pascal@17473
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188 lodsw
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pascal@13713
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189 popw %ds
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pascal@14150
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190 jne NoVCPI
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pascal@17473
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191 xorw $0x5858, %ax // XX(X0)
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pascal@13713
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192 movw $EXEADRS(CmdVCPI), %si
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pascal@13713
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193 ChkVCPI:
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pascal@13713
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194 NoVCPI:
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pascal@13713
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195 movb $EXESTR(ERRvcpi), %al
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pascal@13713
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196 jne abort
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pascal@13713
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197 lodsb
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pascal@13713
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198 shlw $8, %ax
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pascal@13713
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199 je VersionVCPI
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pascal@13713
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200 int $0x67
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pascal@13713
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201 testb %ah, %ah
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pascal@17562
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202 xchgw %ax, %cx
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pascal@13713
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203 jmp ChkVCPI
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pascal@13713
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204 CmdVCPI:
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pascal@13713
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205 .byte 0x40 // status
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pascal@13713
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206 .byte 0xDE // vcpi present ?
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pascal@13713
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207 .byte 0x46 // version
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pascal@13713
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208 .byte 0
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pascal@13713
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209
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pascal@17496
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210 vm86modemsg:
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pascal@17473
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211 // --------------- Must be in 7F40 7FFF range ------------------------
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pascal@17810
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212 .ascii "86" // 86 mode
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pascal@17562
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213 .byte EXESTR(mode)
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pascal@14261
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214 ERRvcpi:
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pascal@17810
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215 .ascii "VCPI4" // VCPI4?
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pascal@17562
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216 .byte EXESTR(need)
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pascal@14261
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217 rmPaging:
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pascal@17810
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218 .ascii "X" // Xreal mode
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pascal@14261
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219 realmodemsg:
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pascal@17562
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220 .ascii "real" // real mode
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pascal@17473
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221 // --------------- Must be in 7FC0 7FFF range ------------------------
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pascal@17562
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222 mode:
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pascal@17562
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223 .ascii " m"
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pascal@17496
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224 ode:
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pascal@17562
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225 .ascii "ode"
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pascal@14261
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226 .byte EXESTR(eol)
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pascal@17562
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227 noDOS3:
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pascal@17810
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228 .ascii "DOS3" // DOS3?
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pascal@17562
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229 need:
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pascal@17810
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230 .ascii "?"
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pascal@17496
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231 .byte EXESTR(eol)
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pascal@17473
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232 help:
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pascal@17562
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233 .ascii "SliTaz iso boot" // SliTaz iso boot
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pascal@17473
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234 eol:
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pascal@17496
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235 .ascii "\r\n"
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pascal@17810
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236 .byte 1 // puts will return
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pascal@14261
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237
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pascal@17496
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238 .space 16,0 // ISO md5
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pascal@14261
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239 .org 0x8000
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pascal@14261
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240 ////////////////////////// ISO9660 header /////////////////////////////////////
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