[88] | 1 | ; Project name : XTIDE Universal BIOS |
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[3] | 2 | ; Description : Displays Boot Menu. |
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| 3 | |
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| 4 | ; Section containing code |
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| 5 | SECTION .text |
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| 6 | |
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| 7 | ;-------------------------------------------------------------------- |
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| 8 | ; Displays Boot Menu and returns Drive or Function number. |
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| 9 | ; |
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| 10 | ; BootMenu_DisplayAndReturnSelection |
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| 11 | ; Parameters: |
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| 12 | ; DS: RAMVARS segment |
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| 13 | ; Returns: |
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[95] | 14 | ; DX: Untranslated drive number to be used for booting |
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[3] | 15 | ; Corrupts registers: |
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| 16 | ; All General Purpose Registers |
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| 17 | ;-------------------------------------------------------------------- |
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| 18 | ALIGN JUMP_ALIGN |
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| 19 | BootMenu_DisplayAndReturnSelection: |
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| 20 | call DriveXlate_Reset |
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| 21 | call BootMenuPrint_TheBottomOfScreen |
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| 22 | call BootMenu_Enter ; Get selected menuitem index to CX |
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| 23 | call BootMenuPrint_ClearScreen |
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[88] | 24 | cmp cx, BYTE NO_ITEM_SELECTED |
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[95] | 25 | je SHORT BootMenu_DisplayAndReturnSelection ; Clear screen and display menu |
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[92] | 26 | jmp SHORT BootMenu_ConvertMenuitemFromCXtoDriveInDX |
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[88] | 27 | |
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| 28 | |
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| 29 | ;-------------------------------------------------------------------- |
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| 30 | ; Enters Boot Menu or submenu. |
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| 31 | ; |
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| 32 | ; BootMenu_Enter |
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| 33 | ; Parameters: |
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| 34 | ; Nothing |
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| 35 | ; Returns: |
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| 36 | ; CX: Index of selected item or NO_ITEM_SELECTED |
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| 37 | ; Corrupts registers: |
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| 38 | ; BX, DI |
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| 39 | ;-------------------------------------------------------------------- |
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[3] | 40 | ALIGN JUMP_ALIGN |
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[88] | 41 | BootMenu_Enter: |
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| 42 | mov bx, BootMenuEvent_Handler |
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| 43 | CALL_MENU_LIBRARY DisplayWithHandlerInBXandUserDataInDXAX |
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| 44 | xchg cx, ax |
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[3] | 45 | ret |
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| 46 | |
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| 47 | |
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| 48 | ;-------------------------------------------------------------------- |
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| 49 | ; Returns number of menuitems in Boot Menu. |
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| 50 | ; |
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[124] | 51 | ; BootMenu_GetMenuitemCountToAX |
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[3] | 52 | ; Parameters: |
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| 53 | ; DS: RAMVARS segment |
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| 54 | ; Returns: |
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[124] | 55 | ; AX: Number of boot menu items |
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[3] | 56 | ; Corrupts registers: |
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[124] | 57 | ; CX |
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[3] | 58 | ;-------------------------------------------------------------------- |
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| 59 | ALIGN JUMP_ALIGN |
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[124] | 60 | BootMenu_GetMenuitemCountToAX: |
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[32] | 61 | call RamVars_GetHardDiskCountFromBDAtoCX |
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| 62 | xchg ax, cx |
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[124] | 63 | call FloppyDrive_GetCountToCX |
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[3] | 64 | add ax, cx |
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| 65 | ret |
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| 66 | |
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| 67 | |
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| 68 | ;-------------------------------------------------------------------- |
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[124] | 69 | ; BootMenu_GetHeightToAHwithItemCountInAL |
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[3] | 70 | ; Parameters: |
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[124] | 71 | ; AL: Number of menuitems |
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[3] | 72 | ; Returns: |
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[88] | 73 | ; AH: Boot menu height |
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[3] | 74 | ; Corrupts registers: |
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[124] | 75 | ; AL, CX, DI |
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[3] | 76 | ;-------------------------------------------------------------------- |
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| 77 | ALIGN JUMP_ALIGN |
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[124] | 78 | BootMenu_GetHeightToAHwithItemCountInAL: |
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| 79 | xchg cx, ax |
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[88] | 80 | add cl, BOOT_MENU_HEIGHT_WITHOUT_ITEMS |
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| 81 | CALL_DISPLAY_LIBRARY GetColumnsToALandRowsToAH |
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[124] | 82 | sub ah, MENU_SCREEN_BOTTOM_LINES*2 ; Leave space for bottom info |
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[88] | 83 | MIN_U ah, cl |
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[3] | 84 | ret |
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| 85 | |
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| 86 | |
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| 87 | ;-------------------------------------------------------------------- |
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[92] | 88 | ; BootMenu_ConvertAsciiHotkeyFromALtoMenuitemInCX |
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[3] | 89 | ; Parameters: |
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[92] | 90 | ; AL: ASCII hotkey starting from upper case 'A' |
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[3] | 91 | ; Returns: |
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| 92 | ; CX: Menuitem index |
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| 93 | ; Corrupts registers: |
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| 94 | ; AX |
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| 95 | ;-------------------------------------------------------------------- |
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| 96 | ALIGN JUMP_ALIGN |
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[92] | 97 | BootMenu_ConvertAsciiHotkeyFromALtoMenuitemInCX: |
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| 98 | call BootMenu_GetLetterForFirstHardDiskToCL |
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[3] | 99 | cmp al, cl ; Letter is for Hard Disk? |
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| 100 | jae SHORT .StartFromHardDiskLetter |
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| 101 | sub al, 'A' ; Letter to Floppy Drive menuitem |
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| 102 | xchg ax, cx ; Menuitem index to CX |
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| 103 | ret |
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| 104 | ALIGN JUMP_ALIGN |
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| 105 | .StartFromHardDiskLetter: |
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| 106 | sub al, cl ; Hard Disk index |
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[124] | 107 | call FloppyDrive_GetCountToCX |
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[3] | 108 | add cx, ax ; Menuitem index |
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| 109 | ret |
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| 110 | |
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| 111 | ;-------------------------------------------------------------------- |
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| 112 | ; Returns letter for first hard disk. Usually it will be 'c' but it |
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| 113 | ; can be higher if more than two floppy drives are found. |
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| 114 | ; |
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[92] | 115 | ; BootMenu_GetLetterForFirstHardDiskToCL |
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[3] | 116 | ; Parameters: |
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| 117 | ; Nothing |
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| 118 | ; Returns: |
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| 119 | ; CL: Upper case letter for first hard disk |
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| 120 | ; Corrupts registers: |
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| 121 | ; CH |
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| 122 | ;-------------------------------------------------------------------- |
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| 123 | ALIGN JUMP_ALIGN |
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[92] | 124 | BootMenu_GetLetterForFirstHardDiskToCL: |
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[124] | 125 | call FloppyDrive_GetCountToCX |
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[3] | 126 | add cl, 'A' |
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| 127 | MAX_U cl, 'C' |
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| 128 | ret |
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| 129 | |
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| 130 | |
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| 131 | ;-------------------------------------------------------------------- |
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[92] | 132 | ; BootMenu_ConvertMenuitemFromCXtoDriveInDX |
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[3] | 133 | ; Parameters: |
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| 134 | ; CX: Index of menuitem selected from Boot Menu |
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| 135 | ; DS: RAMVARS segment |
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| 136 | ; Returns: |
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[92] | 137 | ; DX: Drive number to be used for booting |
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[3] | 138 | ; Corrupts registers: |
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[92] | 139 | ; CX |
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[3] | 140 | ;-------------------------------------------------------------------- |
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| 141 | ALIGN JUMP_ALIGN |
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[92] | 142 | BootMenu_ConvertMenuitemFromCXtoDriveInDX: |
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[3] | 143 | mov dx, cx ; Copy menuitem index to DX |
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[124] | 144 | call FloppyDrive_GetCountToCX |
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[3] | 145 | cmp dx, cx ; Floppy drive? |
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| 146 | jb SHORT .ReturnFloppyDriveInDX |
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| 147 | sub dx, cx ; Remove floppy drives from index |
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| 148 | or dl, 80h |
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| 149 | .ReturnFloppyDriveInDX: |
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| 150 | ret |
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| 151 | |
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| 152 | |
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| 153 | ;-------------------------------------------------------------------- |
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[124] | 154 | ; BootMenu_GetMenuitemToDXforDriveInDL |
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[3] | 155 | ; Parameters: |
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| 156 | ; DL: Drive number |
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| 157 | ; Returns: |
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[124] | 158 | ; DX: Menuitem index (assuming drive is available) |
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[3] | 159 | ; Corrupts registers: |
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[124] | 160 | ; Nothing |
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[3] | 161 | ;-------------------------------------------------------------------- |
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| 162 | ALIGN JUMP_ALIGN |
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[124] | 163 | BootMenu_GetMenuitemToDXforDriveInDL: |
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| 164 | xor dh, dh ; Drive number now in DX |
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| 165 | test dl, 80h |
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| 166 | jz SHORT .ReturnItemIndexInDX ; Return if floppy drive (HD bit not set) |
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| 167 | call FloppyDrive_GetCountToCX |
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| 168 | add dx, cx |
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| 169 | .ReturnItemIndexInDX: |
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[3] | 170 | ret |
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| 171 | |
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| 172 | |
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| 173 | ;-------------------------------------------------------------------- |
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| 174 | ; Checks is drive number valid for this system. |
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| 175 | ; |
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| 176 | ; BootMenu_IsDriveInSystem |
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| 177 | ; Parameters: |
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| 178 | ; DL: Drive number |
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| 179 | ; DS: RAMVARS segment |
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| 180 | ; Returns: |
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[28] | 181 | ; CF: Set if drive number is valid |
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[3] | 182 | ; Clear if drive is not present in system |
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| 183 | ; Corrupts registers: |
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[28] | 184 | ; AX, CX |
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[3] | 185 | ;-------------------------------------------------------------------- |
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| 186 | ALIGN JUMP_ALIGN |
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| 187 | BootMenu_IsDriveInSystem: |
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[32] | 188 | test dl, 80h ; Floppy drive? |
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[3] | 189 | jz SHORT .IsFloppyDriveIsInSystem |
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[32] | 190 | call RamVars_GetHardDiskCountFromBDAtoCX ; Hard Disk count to CX |
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| 191 | or cl, 80h ; Set Hard Disk bit to CX |
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[28] | 192 | jmp SHORT .CompareDriveNumberToDriveCount |
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[3] | 193 | .IsFloppyDriveIsInSystem: |
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[124] | 194 | call FloppyDrive_GetCountToCX |
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[28] | 195 | .CompareDriveNumberToDriveCount: |
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[124] | 196 | cmp dl, cl ; Set CF when DL is smaller |
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[3] | 197 | ret |
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