[57] | 1 | ; File name : EEPROM.asm
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| 2 | ; Project name : XTIDE Univeral BIOS Configurator v2
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| 3 | ; Created date : 19.4.2010
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[68] | 4 | ; Last update : 9.12.2010
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[57] | 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Functions for managing EEPROM contents.
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| 7 |
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[65] | 8 | ; Section containing initialized data
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| 9 | SECTION .data
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| 10 |
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| 11 | ALIGN WORD_ALIGN
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| 12 | g_rgwEepromTypeToSizeInWords:
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| 13 | dw (2<<10) / 2 ; EEPROM_TYPE.2816_2kiB
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| 14 | dw (8<<10) / 2
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| 15 | dw (32<<10) / 2
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| 16 | dw (64<<10) / 2
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| 17 |
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| 18 | g_rgwEepromPageToSizeInBytes:
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| 19 | dw 1 ; EEPROM_PAGE.1_byte
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| 20 | dw 2
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| 21 | dw 4
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| 22 | dw 8
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| 23 | dw 16
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| 24 | dw 32
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| 25 | dw 64
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| 26 |
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| 27 |
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| 28 |
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[57] | 29 | ; Section containing code
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| 30 | SECTION .text
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| 31 |
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| 32 | ;--------------------------------------------------------------------
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[68] | 33 | ; EEPROM_LoadXtideUniversalBiosFromRomToRamBufferAndReturnSizeInDXCX
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[57] | 34 | ; Parameters:
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| 35 | ; Nothing
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| 36 | ; Returns:
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[68] | 37 | ; DX:CX: BIOS size in bytes
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[57] | 38 | ; Corrupts registers:
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| 39 | ; AX, BX, SI, DI
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| 40 | ;--------------------------------------------------------------------
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| 41 | ALIGN JUMP_ALIGN
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[68] | 42 | EEPROM_LoadXtideUniversalBiosFromRomToRamBufferAndReturnSizeInDXCX:
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[57] | 43 | push es
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| 44 |
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| 45 | call EEPROM_FindXtideUniversalBiosROMtoESDI
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[68] | 46 | call .GetXtideUniversalBiosSizeFromEStoDXCX
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[57] | 47 | xor si, si ; Load from beginning of ROM
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| 48 | call LoadBytesFromRomToRamBuffer
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| 49 |
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[68] | 50 | call .GetXtideUniversalBiosSizeFromEStoDXCX
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[57] | 51 | pop es
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| 52 | ret
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| 53 |
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| 54 | ;--------------------------------------------------------------------
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[68] | 55 | ; .GetXtideUniversalBiosSizeFromEStoDXCX
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[57] | 56 | ; Parameters:
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| 57 | ; Nothing
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| 58 | ; Returns:
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[68] | 59 | ; DX:CX: Bios size in bytes
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[57] | 60 | ; Corrupts registers:
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[68] | 61 | ; Nothing
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[57] | 62 | ;--------------------------------------------------------------------
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| 63 | ALIGN JUMP_ALIGN
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[68] | 64 | .GetXtideUniversalBiosSizeFromEStoDXCX:
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| 65 | xor dx, dx
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[57] | 66 | eMOVZX cx, BYTE [es:ROMVARS.bRomSize]
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| 67 | eSHL_IM cx, 9 ; *= 512 for byte count
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| 68 | ret
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| 69 |
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| 70 |
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| 71 | ;--------------------------------------------------------------------
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| 72 | ; EEPROM_LoadOldSettingsFromRomToRamBuffer
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| 73 | ; Parameters:
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| 74 | ; Nothing
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| 75 | ; Returns:
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| 76 | ; CF: Set if EEPROM was found
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| 77 | ; Cleared if EEPROM not found
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| 78 | ; Corrupts registers:
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| 79 | ; AX, BX, CX, SI, DI
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| 80 | ;--------------------------------------------------------------------
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| 81 | ALIGN JUMP_ALIGN
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| 82 | EEPROM_LoadOldSettingsFromRomToRamBuffer:
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| 83 | mov cx, ROMVARS_size - ROMVARS.wFlags ; Number of bytes to load
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| 84 | mov si, ROMVARS.wFlags ; Offset where to start loading
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| 85 | ; Fall to LoadBytesFromRomToRamBuffer
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| 86 |
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| 87 | ;--------------------------------------------------------------------
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| 88 | ; LoadBytesFromRomToRamBuffer
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| 89 | ; Parameters:
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| 90 | ; CX: Number of bytes to load from ROM
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| 91 | ; SI: Offset to first byte to load
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| 92 | ; Returns:
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| 93 | ; CF: Set if EEPROM was found
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| 94 | ; Cleared if EEPROM not found
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| 95 | ; Corrupts registers:
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| 96 | ; AX, BX, CX, SI, DI
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| 97 | ;--------------------------------------------------------------------
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| 98 | ALIGN JUMP_ALIGN
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| 99 | LoadBytesFromRomToRamBuffer:
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| 100 | push es
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| 101 | push ds
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| 102 |
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| 103 | call EEPROM_FindXtideUniversalBiosROMtoESDI
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| 104 | jnc SHORT .XtideUniversalBiosNotFound
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| 105 | push es
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| 106 | pop ds ; DS:SI points to ROM
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| 107 |
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| 108 | call Buffers_GetFileBufferToESDI
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| 109 | mov di, si ; ES:DI points to RAM buffer
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| 110 |
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| 111 | cld
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| 112 | call Memory_CopyCXbytesFromDSSItoESDI
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| 113 | stc
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| 114 |
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| 115 | .XtideUniversalBiosNotFound:
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| 116 | pop ds
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| 117 | pop es
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| 118 | ret
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| 119 |
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| 120 |
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| 121 | ;--------------------------------------------------------------------
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| 122 | ; EEPROM_FindXtideUniversalBiosROMtoESDI
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| 123 | ; Parameters:
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| 124 | ; Nothing
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| 125 | ; Returns:
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| 126 | ; ES:DI: EEPROM segment
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| 127 | ; CF: Set if EEPROM was found
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| 128 | ; Cleared if EEPROM not found
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| 129 | ; Corrupts registers:
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| 130 | ; AX, BX
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| 131 | ;--------------------------------------------------------------------
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| 132 | ALIGN JUMP_ALIGN
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| 133 | EEPROM_FindXtideUniversalBiosROMtoESDI:
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| 134 | push si
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| 135 | push cx
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| 136 |
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| 137 | xor di, di ; Zero DI (offset)
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| 138 | mov bx, 0C000h ; First possible ROM segment
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| 139 | ALIGN JUMP_ALIGN
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| 140 | .SegmentLoop:
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| 141 | mov es, bx ; Possible ROM segment to ES
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| 142 | call Buffers_IsXtideUniversalBiosSignatureInESDI
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| 143 | je SHORT .RomFound
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| 144 | add bx, 200h ; Increment by 8kB
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| 145 | jnc SHORT .SegmentLoop ; Loop until segment overflows
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| 146 | clc
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| 147 | jmp SHORT .ReturnWithoutUpdatingCF
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| 148 | ALIGN JUMP_ALIGN
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| 149 | .RomFound:
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| 150 | stc
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| 151 | .ReturnWithoutUpdatingCF:
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| 152 | pop cx
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| 153 | pop si
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| 154 | ret
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| 155 |
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| 156 |
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| 157 | ;--------------------------------------------------------------------
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[65] | 158 | ; EEPROM_LoadFromRomToRamComparisonBuffer
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[57] | 159 | ; Parameters:
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| 160 | ; Nothing
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| 161 | ; Returns:
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[65] | 162 | ; Nothing
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[57] | 163 | ; Corrupts registers:
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[65] | 164 | ; BX, CX, SI, DI
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[57] | 165 | ;--------------------------------------------------------------------
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| 166 | ALIGN JUMP_ALIGN
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[65] | 167 | EEPROM_LoadFromRomToRamComparisonBuffer:
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| 168 | push es
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| 169 | push ds
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| 170 |
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| 171 | mov ds, [cs:g_cfgVars+CFGVARS.wEepromSegment]
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| 172 | xor si, si
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| 173 | call Buffers_GetFlashComparisonBufferToESDI
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| 174 | eMOVZX bx, BYTE [cs:g_cfgVars+CFGVARS.bEepromType]
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| 175 | mov cx, [cs:bx+g_rgwEepromTypeToSizeInWords]
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| 176 | cld
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| 177 | rep movsw
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| 178 |
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| 179 | pop ds
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| 180 | pop es
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[57] | 181 | ret
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