[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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[243] | 10 | ; BootMenu_DisplayAndReturnSelectionInDX |
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[3] | 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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[243] | 19 | BootMenu_DisplayAndReturnSelectionInDX: |
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[3] | 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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[241] | 24 | call BootMenu_GetDriveToDXforMenuitemInCX |
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[243] | 25 | jnc BootMenu_DisplayAndReturnSelectionInDX |
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[241] | 26 | ret |
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[88] | 27 | |
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[128] | 28 | ;-------------------------------------------------------------------- |
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[248] | 29 | ; BootMenu_GetDriveToDXforMenuitemInCX_And_RamVars_GetSegmentToDS |
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[130] | 30 | ; BootMenu_GetDriveToDXforMenuitemInCX |
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[128] | 31 | ; Parameters: |
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| 32 | ; CX: Index of menuitem selected from Boot Menu |
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| 33 | ; Returns: |
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| 34 | ; DX: Drive number to be used for booting |
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[241] | 35 | ; DS: RAMVARS segment |
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| 36 | ; CF: Set: There is a selected menu item, DL is valid |
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| 37 | ; Clear: There is no selected menu item, DL is not valid |
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[128] | 38 | ; Corrupts registers: |
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[241] | 39 | ; CX, DI |
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[128] | 40 | ;-------------------------------------------------------------------- |
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| 41 | ALIGN JUMP_ALIGN |
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[241] | 42 | BootMenu_GetDriveToDXforMenuitemInCX_And_RamVars_GetSegmentToDS: |
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| 43 | call RamVars_GetSegmentToDS |
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| 44 | ;;; fall-through |
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| 45 | |
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| 46 | ALIGN JUMP_ALIGN |
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[130] | 47 | BootMenu_GetDriveToDXforMenuitemInCX: |
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[241] | 48 | cmp cl, NO_ITEM_HIGHLIGHTED |
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| 49 | je SHORT .ReturnFloppyDriveInDX ; Clear CF if branch taken |
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| 50 | |
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| 51 | mov dl, cl ; Copy menuitem index to DX |
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[128] | 52 | call FloppyDrive_GetCountToCX |
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[241] | 53 | cmp dl, cl ; Floppy drive? |
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| 54 | jb SHORT .ReturnFloppyDriveInDX ; Set CF if branch taken |
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| 55 | or cl, 80h ; Or 80h into CL before the sub |
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| 56 | ; to cause CF to be set after |
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| 57 | ; and result has high order bit set |
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| 58 | sub dl, cl ; Remove floppy drives from index |
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| 59 | |
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[128] | 60 | .ReturnFloppyDriveInDX: |
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| 61 | ret |
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[88] | 62 | |
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[128] | 63 | |
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[88] | 64 | ;-------------------------------------------------------------------- |
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| 65 | ; Enters Boot Menu or submenu. |
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| 66 | ; |
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| 67 | ; BootMenu_Enter |
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| 68 | ; Parameters: |
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| 69 | ; Nothing |
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| 70 | ; Returns: |
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| 71 | ; CX: Index of selected item or NO_ITEM_SELECTED |
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| 72 | ; Corrupts registers: |
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[127] | 73 | ; AX, BX, DI |
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[88] | 74 | ;-------------------------------------------------------------------- |
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[3] | 75 | ALIGN JUMP_ALIGN |
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[88] | 76 | BootMenu_Enter: |
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| 77 | mov bx, BootMenuEvent_Handler |
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| 78 | CALL_MENU_LIBRARY DisplayWithHandlerInBXandUserDataInDXAX |
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| 79 | xchg cx, ax |
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[3] | 80 | ret |
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| 81 | |
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| 82 | |
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| 83 | ;-------------------------------------------------------------------- |
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| 84 | ; Returns number of menuitems in Boot Menu. |
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| 85 | ; |
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[124] | 86 | ; BootMenu_GetMenuitemCountToAX |
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[3] | 87 | ; Parameters: |
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| 88 | ; DS: RAMVARS segment |
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| 89 | ; Returns: |
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[124] | 90 | ; AX: Number of boot menu items |
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[3] | 91 | ; Corrupts registers: |
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[124] | 92 | ; CX |
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[3] | 93 | ;-------------------------------------------------------------------- |
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| 94 | ALIGN JUMP_ALIGN |
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[124] | 95 | BootMenu_GetMenuitemCountToAX: |
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[32] | 96 | call RamVars_GetHardDiskCountFromBDAtoCX |
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| 97 | xchg ax, cx |
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[124] | 98 | call FloppyDrive_GetCountToCX |
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[3] | 99 | add ax, cx |
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| 100 | ret |
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| 101 | |
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| 102 | |
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| 103 | ;-------------------------------------------------------------------- |
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[124] | 104 | ; BootMenu_GetHeightToAHwithItemCountInAL |
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[3] | 105 | ; Parameters: |
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[124] | 106 | ; AL: Number of menuitems |
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[3] | 107 | ; Returns: |
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[88] | 108 | ; AH: Boot menu height |
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[3] | 109 | ; Corrupts registers: |
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[124] | 110 | ; AL, CX, DI |
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[3] | 111 | ;-------------------------------------------------------------------- |
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| 112 | ALIGN JUMP_ALIGN |
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[124] | 113 | BootMenu_GetHeightToAHwithItemCountInAL: |
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[128] | 114 | add al, BOOT_MENU_HEIGHT_WITHOUT_ITEMS |
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[124] | 115 | xchg cx, ax |
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[88] | 116 | CALL_DISPLAY_LIBRARY GetColumnsToALandRowsToAH |
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[124] | 117 | sub ah, MENU_SCREEN_BOTTOM_LINES*2 ; Leave space for bottom info |
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[181] | 118 | cmp ah, cl |
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| 119 | jb SHORT .Return |
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| 120 | mov ah, cl |
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| 121 | ALIGN JUMP_ALIGN, ret |
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| 122 | .Return: |
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[3] | 123 | ret |
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| 124 | |
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| 125 | |
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| 126 | ;-------------------------------------------------------------------- |
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[130] | 127 | ; BootMenu_GetMenuitemToAXforAsciiHotkeyInAL |
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[3] | 128 | ; Parameters: |
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[130] | 129 | ; AL: ASCII hotkey |
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[3] | 130 | ; Returns: |
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[130] | 131 | ; AX: Menuitem index |
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[3] | 132 | ; Corrupts registers: |
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[130] | 133 | ; CX |
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[3] | 134 | ;-------------------------------------------------------------------- |
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| 135 | ALIGN JUMP_ALIGN |
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[130] | 136 | BootMenu_GetMenuitemToAXforAsciiHotkeyInAL: |
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| 137 | call Char_ALtoUpperCaseLetter |
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[92] | 138 | call BootMenu_GetLetterForFirstHardDiskToCL |
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[130] | 139 | xor ah, ah |
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[3] | 140 | cmp al, cl ; Letter is for Hard Disk? |
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| 141 | jae SHORT .StartFromHardDiskLetter |
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| 142 | sub al, 'A' ; Letter to Floppy Drive menuitem |
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| 143 | ret |
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| 144 | ALIGN JUMP_ALIGN |
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| 145 | .StartFromHardDiskLetter: |
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| 146 | sub al, cl ; Hard Disk index |
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[124] | 147 | call FloppyDrive_GetCountToCX |
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[130] | 148 | add ax, cx ; Menuitem index |
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[3] | 149 | ret |
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| 150 | |
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[128] | 151 | |
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[3] | 152 | ;-------------------------------------------------------------------- |
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| 153 | ; Returns letter for first hard disk. Usually it will be 'c' but it |
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| 154 | ; can be higher if more than two floppy drives are found. |
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| 155 | ; |
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[92] | 156 | ; BootMenu_GetLetterForFirstHardDiskToCL |
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[3] | 157 | ; Parameters: |
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| 158 | ; Nothing |
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| 159 | ; Returns: |
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| 160 | ; CL: Upper case letter for first hard disk |
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| 161 | ; Corrupts registers: |
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| 162 | ; CH |
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| 163 | ;-------------------------------------------------------------------- |
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| 164 | ALIGN JUMP_ALIGN |
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[92] | 165 | BootMenu_GetLetterForFirstHardDiskToCL: |
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[124] | 166 | call FloppyDrive_GetCountToCX |
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[3] | 167 | add cl, 'A' |
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[181] | 168 | cmp cl, 'C' |
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| 169 | ja .Return |
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| 170 | mov cl, 'C' |
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| 171 | ALIGN JUMP_ALIGN, ret |
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| 172 | .Return: |
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[3] | 173 | ret |
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| 174 | |
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| 175 | |
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| 176 | ;-------------------------------------------------------------------- |
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[124] | 177 | ; BootMenu_GetMenuitemToDXforDriveInDL |
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[3] | 178 | ; Parameters: |
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| 179 | ; DL: Drive number |
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| 180 | ; Returns: |
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[124] | 181 | ; DX: Menuitem index (assuming drive is available) |
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[3] | 182 | ; Corrupts registers: |
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[124] | 183 | ; Nothing |
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[3] | 184 | ;-------------------------------------------------------------------- |
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| 185 | ALIGN JUMP_ALIGN |
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[124] | 186 | BootMenu_GetMenuitemToDXforDriveInDL: |
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| 187 | xor dh, dh ; Drive number now in DX |
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[128] | 188 | test dl, dl |
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| 189 | jns SHORT .ReturnItemIndexInDX ; Return if floppy drive (HD bit not set) |
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[124] | 190 | call FloppyDrive_GetCountToCX |
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[127] | 191 | and dl, ~80h ; Clear HD bit |
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[124] | 192 | add dx, cx |
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| 193 | .ReturnItemIndexInDX: |
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[3] | 194 | ret |
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| 195 | |
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| 196 | |
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| 197 | ;-------------------------------------------------------------------- |
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| 198 | ; Checks is drive number valid for this system. |
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| 199 | ; |
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| 200 | ; BootMenu_IsDriveInSystem |
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| 201 | ; Parameters: |
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| 202 | ; DL: Drive number |
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| 203 | ; DS: RAMVARS segment |
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| 204 | ; Returns: |
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[28] | 205 | ; CF: Set if drive number is valid |
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[3] | 206 | ; Clear if drive is not present in system |
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| 207 | ; Corrupts registers: |
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[28] | 208 | ; AX, CX |
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[3] | 209 | ;-------------------------------------------------------------------- |
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| 210 | ALIGN JUMP_ALIGN |
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| 211 | BootMenu_IsDriveInSystem: |
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[128] | 212 | test dl, dl ; Floppy drive? |
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[130] | 213 | jns SHORT .IsFloppyDriveInSystem |
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[32] | 214 | call RamVars_GetHardDiskCountFromBDAtoCX ; Hard Disk count to CX |
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| 215 | or cl, 80h ; Set Hard Disk bit to CX |
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[28] | 216 | jmp SHORT .CompareDriveNumberToDriveCount |
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[130] | 217 | .IsFloppyDriveInSystem: |
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[124] | 218 | call FloppyDrive_GetCountToCX |
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[28] | 219 | .CompareDriveNumberToDriveCount: |
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[124] | 220 | cmp dl, cl ; Set CF when DL is smaller |
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[3] | 221 | ret |
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