Video Mode Selection Support 2.9
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Video Mode Selection Support 2.9
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(c) 1995, 1996 Martin Mares,
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(c) 1995, 1996 Martin Mares,
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--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
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1. Intro
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1. Intro
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~~~~~~~~
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~~~~~~~~
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This small document describes the "Video Mode Selection" feature which
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This small document describes the "Video Mode Selection" feature which
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allows to use various special video modes supported by the video BIOS. Due
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allows to use various special video modes supported by the video BIOS. Due
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to usage of the BIOS, the selection is limited to the boot time (before the
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to usage of the BIOS, the selection is limited to the boot time (before the
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kernel decompression starts and works only on 80X86 machines.
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kernel decompression starts and works only on 80X86 machines.
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IF YOU USE THIS FEATURE, I'LL BE MUCH PLEASED IF YOU SEND ME A MAIL
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IF YOU USE THIS FEATURE, I'LL BE MUCH PLEASED IF YOU SEND ME A MAIL
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DESCRIBING YOUR EXPERIENCE WITH IT. BUG REPORTS ARE ALSO WELCOME.
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DESCRIBING YOUR EXPERIENCE WITH IT. BUG REPORTS ARE ALSO WELCOME.
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The video mode to be used is selected by a kernel parameter which can be
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The video mode to be used is selected by a kernel parameter which can be
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specified in the kernel Makefile (the SVGA_MODE=... line) or by the "vga=..."
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specified in the kernel Makefile (the SVGA_MODE=... line) or by the "vga=..."
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option of LILO or by the "vidmode" utility (present in standard Linux utility
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option of LILO or by the "vidmode" utility (present in standard Linux utility
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packages). You can use the following settings of this parameter:
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packages). You can use the following settings of this parameter:
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NORMAL_VGA - Standard 80x25 mode available on all display adapters.
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NORMAL_VGA - Standard 80x25 mode available on all display adapters.
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EXTENDED_VGA - Standard 8-pixel font mode: 80x43 on EGA, 80x50 on VGA.
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EXTENDED_VGA - Standard 8-pixel font mode: 80x43 on EGA, 80x50 on VGA.
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ASK_VGA - Display a video mode menu upon startup (see below).
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ASK_VGA - Display a video mode menu upon startup (see below).
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0..35 - Menu item number (when you have used the menu to view the list of
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0..35 - Menu item number (when you have used the menu to view the list of
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modes available on your adapter, you can specify the menu item you want
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modes available on your adapter, you can specify the menu item you want
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to use). 0..9 correspond to "0".."9", 10..35 to "a".."z". Warning: the
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to use). 0..9 correspond to "0".."9", 10..35 to "a".."z". Warning: the
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mode list displayed may vary as the kernel version changes, because the
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mode list displayed may vary as the kernel version changes, because the
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modes are listed in a "first detected -- first displayed" manner. It's
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modes are listed in a "first detected -- first displayed" manner. It's
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better to use absolute mode numbers instead.
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better to use absolute mode numbers instead.
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0x.... - Hexadecimal video mode ID (also displayed on the menu, see below
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0x.... - Hexadecimal video mode ID (also displayed on the menu, see below
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for exact meaning of the ID). Warning: rdev and LILO don't support
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for exact meaning of the ID). Warning: rdev and LILO don't support
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hexadecimal numbers -- you have to convert it to decimal manually.
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hexadecimal numbers -- you have to convert it to decimal manually.
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2. Menu
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2. Menu
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~~~~~~~
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~~~~~~~
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The ASK_VGA mode causes the kernel to offer a video mode menu upon
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The ASK_VGA mode causes the kernel to offer a video mode menu upon
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bootup. It displays a "Press to see video modes available,
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bootup. It displays a "Press to see video modes available,
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to continue or wait 30 secs" message. If you press , you enter the
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to continue or wait 30 secs" message. If you press , you enter the
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menu, if you press or wait 30 seconds, the kernel will boot up with
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menu, if you press or wait 30 seconds, the kernel will boot up with
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the standard 80x25 mode set.
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the standard 80x25 mode set.
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The menu looks like:
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The menu looks like:
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Video adapter:
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Video adapter:
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Mode: COLSxROWS:
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Mode: COLSxROWS:
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0 0F00 80x25
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0 0F00 80x25
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1 0F01 80x50
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1 0F01 80x50
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2 0F02 80x43
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2 0F02 80x43
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3 0F03 80x26
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3 0F03 80x26
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....
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....
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Enter mode number:
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Enter mode number:
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should contain a name of your video adapter
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should contain a name of your video adapter
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or the chip in it or at least whether it's an EGA or VGA or VESA VGA (VGA with
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or the chip in it or at least whether it's an EGA or VGA or VESA VGA (VGA with
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a VESA-compliant BIOS in it). If it doesn't match your configuration, tell me
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a VESA-compliant BIOS in it). If it doesn't match your configuration, tell me
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and I'll try to fix it somehow (you know, hardware detection is a real pain
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and I'll try to fix it somehow (you know, hardware detection is a real pain
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on PC's).
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on PC's).
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"0 0F00 80x25" tells that the first menu item (the menu items are numbered
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"0 0F00 80x25" tells that the first menu item (the menu items are numbered
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from "0" to "9" and from "a" to "z") is a 80x25 mode with ID=0x0f00 (see the
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from "0" to "9" and from "a" to "z") is a 80x25 mode with ID=0x0f00 (see the
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next section for a description of the mode ID's).
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next section for a description of the mode ID's).
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encourages you to write the item number or mode ID
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encourages you to write the item number or mode ID
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you wish to set and press . If the computer complains something about
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you wish to set and press . If the computer complains something about
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"Unknown mode ID", it tries to explain you that it isn't possible to set such
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"Unknown mode ID", it tries to explain you that it isn't possible to set such
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a mode. It's also possible to press only which forces the current
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a mode. It's also possible to press only which forces the current
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mode to be used.
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mode to be used.
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The mode list may be a bit inaccurate on your machine (it isn't possible
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The mode list may be a bit inaccurate on your machine (it isn't possible
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to autodetect all existing video cards and their mutations). Some of the
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to autodetect all existing video cards and their mutations). Some of the
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modes may be unsettable, some of them might work incorrectly with Linux
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modes may be unsettable, some of them might work incorrectly with Linux
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(the common case is mirroring of first few lines at the bottom of the screen
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(the common case is mirroring of first few lines at the bottom of the screen
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because of BIOS bugs) or there can exist modes which are not displayed. If
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because of BIOS bugs) or there can exist modes which are not displayed. If
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you think the list doesn't match your configuration, let me know and I'll try
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you think the list doesn't match your configuration, let me know and I'll try
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to add your configuration to the next version of the mode selector.
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to add your configuration to the next version of the mode selector.
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The modes displayed on the menu are partially sorted: The list starts with
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The modes displayed on the menu are partially sorted: The list starts with
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the standard modes (80x25 and 80x50) followed by "special" modes (80x28 and
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the standard modes (80x25 and 80x50) followed by "special" modes (80x28 and
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80x43), local modes (if the local modes feature is enabled), VESA modes and
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80x43), local modes (if the local modes feature is enabled), VESA modes and
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finally SVGA modes for the auto-detected adapter.
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finally SVGA modes for the auto-detected adapter.
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If you enter "scan" instead of item number / mode ID, the program will try
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If you enter "scan" instead of item number / mode ID, the program will try
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to scan your video modes in a slightly aggressive, but much more accurate way.
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to scan your video modes in a slightly aggressive, but much more accurate way.
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This should reveal all video modes supported by your BIOS. During this process,
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This should reveal all video modes supported by your BIOS. During this process,
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the screen will flash wildly and strange things will appear. If you are afraid
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the screen will flash wildly and strange things will appear. If you are afraid
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this could damage your monitor, don't use this functions. After scanning, the
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this could damage your monitor, don't use this functions. After scanning, the
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mode ordering is a bit different: the auto-detected SVGA modes are not listed
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mode ordering is a bit different: the auto-detected SVGA modes are not listed
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at all and the modes revealed by the scan are shown before the VESA modes.
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at all and the modes revealed by the scan are shown before the VESA modes.
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3. Mode ID's
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3. Mode ID's
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~~~~~~~~~~~~
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~~~~~~~~~~~~
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Because of the complexity of all the video stuff, the video mode ID's
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Because of the complexity of all the video stuff, the video mode ID's
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used here are also a bit complex. A video mode ID is a 16-bit number usually
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used here are also a bit complex. A video mode ID is a 16-bit number usually
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expressed in a hexadecimal notation (starting with "0x"). The ID numbers
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expressed in a hexadecimal notation (starting with "0x"). The ID numbers
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can be divided to three regions:
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can be divided to three regions:
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0x0000 to 0x00ff - menu item references. 0x0000 is the first item.
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0x0000 to 0x00ff - menu item references. 0x0000 is the first item.
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0x0100 to 0x017f - standard BIOS modes. The ID is a BIOS video mode number
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0x0100 to 0x017f - standard BIOS modes. The ID is a BIOS video mode number
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(as presented to INT 10, function 00) increased by 0x0100. You can
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(as presented to INT 10, function 00) increased by 0x0100. You can
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use any mode numbers even if not shown on the menu.
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use any mode numbers even if not shown on the menu.
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0x0200 to 0x08ff - VESA BIOS modes. The ID is a VESA mode ID increased by
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0x0200 to 0x08ff - VESA BIOS modes. The ID is a VESA mode ID increased by
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0x0100. All VESA modes should be autodetected and shown on the menu.
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0x0100. All VESA modes should be autodetected and shown on the menu.
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0x0900 to 0x09ff - Video7 special modes. Set by calling INT 0x10, AX=0x6f05.
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0x0900 to 0x09ff - Video7 special modes. Set by calling INT 0x10, AX=0x6f05.
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0x0f00 to 0x0fff - special modes (they are set by various tricks -- usually
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0x0f00 to 0x0fff - special modes (they are set by various tricks -- usually
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by modifying one of the standard modes). Currently available:
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by modifying one of the standard modes). Currently available:
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0x0f00 standard 80x25, don't reset mode if already set (=FFFF)
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0x0f00 standard 80x25, don't reset mode if already set (=FFFF)
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0x0f01 standard with 8-point font: 80x43 on EGA, 80x50 on VGA
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0x0f01 standard with 8-point font: 80x43 on EGA, 80x50 on VGA
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0x0f02 VGA 80x43 (VGA switched to 350 scanlines with a 8-point font)
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0x0f02 VGA 80x43 (VGA switched to 350 scanlines with a 8-point font)
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0x0f03 VGA 80x28 (standard VGA scans, but 14-point font)
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0x0f03 VGA 80x28 (standard VGA scans, but 14-point font)
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0x0f04 leave current video mode
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0x0f04 leave current video mode
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0x0f05 VGA 80x30 (480 scans, 16-point font)
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0x0f05 VGA 80x30 (480 scans, 16-point font)
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0x0f06 VGA 80x34 (480 scans, 14-point font)
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0x0f06 VGA 80x34 (480 scans, 14-point font)
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0x0f07 VGA 80x60 (480 scans, 8-point font)
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0x0f07 VGA 80x60 (480 scans, 8-point font)
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0x1000 to 0x7fff - modes specified by resolution. The code has a "0xRRCC"
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0x1000 to 0x7fff - modes specified by resolution. The code has a "0xRRCC"
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form where RR is a number of rows and CC is a number of columns.
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form where RR is a number of rows and CC is a number of columns.
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E.g., 0x1950 corresponds to a 80x25 mode, 0x2b84 to 132x43 etc.
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E.g., 0x1950 corresponds to a 80x25 mode, 0x2b84 to 132x43 etc.
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This is the only fully portable way to refer to a non-standard mode.
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This is the only fully portable way to refer to a non-standard mode.
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0xff00 to 0xffff - aliases for backward compatibility:
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0xff00 to 0xffff - aliases for backward compatibility:
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0xffff equivalent to 0x0f00 (standard 80x25)
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0xffff equivalent to 0x0f00 (standard 80x25)
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0xfffe equivalent to 0x0f01 (EGA 80x43 or VGA 80x50)
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0xfffe equivalent to 0x0f01 (EGA 80x43 or VGA 80x50)
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If you add 0x8000 to the mode ID, the program will try to recalculate
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If you add 0x8000 to the mode ID, the program will try to recalculate
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vertical display timing according to mode parameters, which can be used to
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vertical display timing according to mode parameters, which can be used to
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eliminate some annoying bugs of certain VGA BIOS'es -- mainly extra lines at
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eliminate some annoying bugs of certain VGA BIOS'es -- mainly extra lines at
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the end of the display.
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the end of the display.
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4. Options
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4. Options
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~~~~~~~~~~
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~~~~~~~~~~
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Some options can be set in the source text (in arch/i386/boot/video.S).
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Some options can be set in the source text (in arch/i386/boot/video.S).
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All of them are simple #define's -- change them to #undef's when you want to
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All of them are simple #define's -- change them to #undef's when you want to
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switch them off. Currently supported:
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switch them off. Currently supported:
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CONFIG_VIDEO_SVGA - enables autodetection of SVGA cards. If your card is
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CONFIG_VIDEO_SVGA - enables autodetection of SVGA cards. If your card is
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detected incorrectly, you can switch this off.
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detected incorrectly, you can switch this off.
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CONFIG_VIDEO_VESA - enables autodetection of VESA modes. If it doesn't work
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CONFIG_VIDEO_VESA - enables autodetection of VESA modes. If it doesn't work
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on your machine (or displays a "Error: Scanning of VESA modes failed" message),
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on your machine (or displays a "Error: Scanning of VESA modes failed" message),
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you can switch it off and report as a bug.
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you can switch it off and report as a bug.
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CONFIG_VIDEO_COMPACT - enables compacting of the video mode list. Duplicate
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CONFIG_VIDEO_COMPACT - enables compacting of the video mode list. Duplicate
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entries (those with the same screen size) are deleted except for the first one
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entries (those with the same screen size) are deleted except for the first one
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(see the previous section for more information on mode ordering). However,
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(see the previous section for more information on mode ordering). However,
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it's possible that the first variant doesn't work, while some of the others do
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it's possible that the first variant doesn't work, while some of the others do
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-- in this case turn this switch off to see the rest.
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-- in this case turn this switch off to see the rest.
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CONFIG_VIDEO_RETAIN - enables retaining of screen contents when switching
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CONFIG_VIDEO_RETAIN - enables retaining of screen contents when switching
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video modes. Works only with some boot loaders which leave enough room for the
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video modes. Works only with some boot loaders which leave enough room for the
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buffer.
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buffer.
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CONFIG_VIDEO_LOCAL - enables inclusion of "local modes" in the list. The
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CONFIG_VIDEO_LOCAL - enables inclusion of "local modes" in the list. The
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local modes are added automatically to the beginning of the list not depending
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local modes are added automatically to the beginning of the list not depending
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by hardware configuration. The local modes are listed in the source text after
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by hardware configuration. The local modes are listed in the source text after
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the "local_mode_table:" line. The comment before this line describes the format
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the "local_mode_table:" line. The comment before this line describes the format
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of the table (which also includes a video card name to be displayed on the
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of the table (which also includes a video card name to be displayed on the
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top of the menu).
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top of the menu).
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5. Adding more cards
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5. Adding more cards
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~~~~~~~~~~~~~~~~~~~~
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~~~~~~~~~~~~~~~~~~~~
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If you have a card not detected by the driver and you are a good programmer,
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If you have a card not detected by the driver and you are a good programmer,
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feel free to add it to the source and send me a diff. It's very simple: You
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feel free to add it to the source and send me a diff. It's very simple: You
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have to add a new entry to the svga_table consisting of a pointer to your mode
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have to add a new entry to the svga_table consisting of a pointer to your mode
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table and a pointer to your detection routine. The order of entries in the
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table and a pointer to your detection routine. The order of entries in the
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svga_table defines the order of probing. Please use only reliable detection
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svga_table defines the order of probing. Please use only reliable detection
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routines which are known to identify _only_ the card in question.
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routines which are known to identify _only_ the card in question.
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The detection routine is called with BP pointing to your mode table and
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The detection routine is called with BP pointing to your mode table and
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ES containing 0xc000. If you want, you may alter BP allowing to select an
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ES containing 0xc000. If you want, you may alter BP allowing to select an
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appropriate mode table according to model ID detected. If the detection fails,
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appropriate mode table according to model ID detected. If the detection fails,
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return BP=0.
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return BP=0.
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The mode table consists of lines containing a (BIOS mode number, rows,
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The mode table consists of lines containing a (BIOS mode number, rows,
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columns) triple and is finished by single zero byte followed by NUL-terminated
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columns) triple and is finished by single zero byte followed by NUL-terminated
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adapter name.
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adapter name.
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6. Still doesn't work?
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6. Still doesn't work?
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~~~~~~~~~~~~~~~~~~~~~~
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~~~~~~~~~~~~~~~~~~~~~~
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When the mode detection doesn't work (e.g., the mode list is incorrect or
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When the mode detection doesn't work (e.g., the mode list is incorrect or
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the machine hangs instead of displaying the menu), try to switch off some of
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the machine hangs instead of displaying the menu), try to switch off some of
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the configuration options listed in section 4. If it fails, you can still use
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the configuration options listed in section 4. If it fails, you can still use
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your kernel with the video mode set directly via the kernel parameter.
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your kernel with the video mode set directly via the kernel parameter.
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In either case, please send me a bug report containing what _exactly_
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In either case, please send me a bug report containing what _exactly_
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happens and how do the configuration switches affect the behaviour of the bug.
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happens and how do the configuration switches affect the behaviour of the bug.
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If you start Linux from the M$-DOS, you might also use some DOS tools for
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If you start Linux from the M$-DOS, you might also use some DOS tools for
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video mode setting. In this case, you must specify the 0x0f04 mode ("leave
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video mode setting. In this case, you must specify the 0x0f04 mode ("leave
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current settings") to Linux, because if you use anything other, the 80x25
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current settings") to Linux, because if you use anything other, the 80x25
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mode will be used automatically.
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mode will be used automatically.
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If you set some SVGA mode and there's one or more extra lines on the
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If you set some SVGA mode and there's one or more extra lines on the
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bottom of the display containing already scrolled-out lines, your VGA BIOS
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bottom of the display containing already scrolled-out lines, your VGA BIOS
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contains the most common video BIOS bug called "incorrect vertical display
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contains the most common video BIOS bug called "incorrect vertical display
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end setting". Adding 0x8000 to the mode ID might fix the problem. Unfortunately,
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end setting". Adding 0x8000 to the mode ID might fix the problem. Unfortunately,
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this must be done manually -- no autodetection mechanisms are available.
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this must be done manually -- no autodetection mechanisms are available.
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7. History
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7. History
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~~~~~~~~~~
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~~~~~~~~~~
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1.0 (??-Nov-95) First version supporting all adapters supported by the old
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1.0 (??-Nov-95) First version supporting all adapters supported by the old
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setup.S + Cirrus Logic 54XX. Present in some 1.3.4? kernels
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setup.S + Cirrus Logic 54XX. Present in some 1.3.4? kernels
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and then removed due to instability on some machines.
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and then removed due to instability on some machines.
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2.0 (28-Jan-96) Rewritten from scratch. Cirrus Logic 64XX support added, almost
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2.0 (28-Jan-96) Rewritten from scratch. Cirrus Logic 64XX support added, almost
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everything is configurable, the VESA support should be much more
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everything is configurable, the VESA support should be much more
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stable, explicit mode numbering allowed, "scan" implemented etc.
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stable, explicit mode numbering allowed, "scan" implemented etc.
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2.1 (30-Jan-96) VESA modes moved to 0x200-0x3ff. Mode selection by resolution
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2.1 (30-Jan-96) VESA modes moved to 0x200-0x3ff. Mode selection by resolution
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supported. Few bugs fixed. VESA modes are listed prior to
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supported. Few bugs fixed. VESA modes are listed prior to
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modes supplied by SVGA autodetection as they are more reliable.
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modes supplied by SVGA autodetection as they are more reliable.
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CLGD autodetect works better. Doesn't depend on 80x25 being
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CLGD autodetect works better. Doesn't depend on 80x25 being
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active when started. Scanning fixed. 80x43 (any VGA) added.
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active when started. Scanning fixed. 80x43 (any VGA) added.
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Code cleaned up.
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Code cleaned up.
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2.2 (01-Feb-96) EGA 80x43 fixed. VESA extended to 0x200-0x4ff (non-standard 02XX
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2.2 (01-Feb-96) EGA 80x43 fixed. VESA extended to 0x200-0x4ff (non-standard 02XX
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VESA modes work now). Display end bug workaround supported.
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VESA modes work now). Display end bug workaround supported.
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Special modes renumbered to allow adding of the "recalculate"
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Special modes renumbered to allow adding of the "recalculate"
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flag, 0xffff and 0xfffe became aliases instead of real ID's.
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flag, 0xffff and 0xfffe became aliases instead of real ID's.
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Screen contents retained during mode changes.
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Screen contents retained during mode changes.
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2.3 (15-Mar-96) Changed to work with 1.3.74 kernel.
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2.3 (15-Mar-96) Changed to work with 1.3.74 kernel.
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2.4 (18-Mar-96) Added patches by Hans Lermen fixing a memory overwrite problem
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2.4 (18-Mar-96) Added patches by Hans Lermen fixing a memory overwrite problem
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with some boot loaders. Memory management rewritten to reflect
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with some boot loaders. Memory management rewritten to reflect
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these changes. Unfortunately, screen contents retaining works
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these changes. Unfortunately, screen contents retaining works
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only with some loaders now.
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only with some loaders now.
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Added a Tseng 132x60 mode.
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Added a Tseng 132x60 mode.
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2.5 (19-Mar-96) Fixed a VESA mode scanning bug introduced in 2.4.
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2.5 (19-Mar-96) Fixed a VESA mode scanning bug introduced in 2.4.
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2.6 (25-Mar-96) Some VESA BIOS errors not reported -- it fixes error reports on
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2.6 (25-Mar-96) Some VESA BIOS errors not reported -- it fixes error reports on
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several cards with broken VESA code (e.g., ATI VGA).
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several cards with broken VESA code (e.g., ATI VGA).
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2.7 (09-Apr-96) - Accepted all VESA modes in range 0x100 to 0x7ff, because some
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2.7 (09-Apr-96) - Accepted all VESA modes in range 0x100 to 0x7ff, because some
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cards use very strange mode numbers.
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cards use very strange mode numbers.
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- Added Realtek VGA modes (thanks to Gonzalo Tornaria).
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- Added Realtek VGA modes (thanks to Gonzalo Tornaria).
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- Hardware testing order slightly changed, tests based on ROM
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- Hardware testing order slightly changed, tests based on ROM
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contents done as first.
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contents done as first.
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- Added support for special Video7 mode switching functions
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- Added support for special Video7 mode switching functions
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(thanks to Tom Vander Aa).
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(thanks to Tom Vander Aa).
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- Added 480-scanline modes (especially useful for notebooks,
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- Added 480-scanline modes (especially useful for notebooks,
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original version written by hhanemaa@cs.ruu.nl, patched by
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original version written by hhanemaa@cs.ruu.nl, patched by
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Jeff Chua, rewritten by me).
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Jeff Chua, rewritten by me).
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- Screen store/restore fixed.
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- Screen store/restore fixed.
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2.8 (14-Apr-96) - Previous release was not compilable without CONFIG_VIDEO_SVGA.
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2.8 (14-Apr-96) - Previous release was not compilable without CONFIG_VIDEO_SVGA.
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- Better recognition of text modes during mode scan.
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- Better recognition of text modes during mode scan.
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2.9 (12-May-96) - Ignored VESA modes 0x80 - 0xff (more VESA BIOS bugs!)
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2.9 (12-May-96) - Ignored VESA modes 0x80 - 0xff (more VESA BIOS bugs!)
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