239 lines
14 KiB
HTML
239 lines
14 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>Int 10/AX=4F00h
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</TITLE>
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<META NAME="Description" CONTENT="
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Int 10/AX=4F00h - VESA SuperVGA BIOS (VBE) - GET SuperVGA INFORMATION -
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AX = 4F00h
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ES:DI - buffer for SuperVGA information (see #00077)
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Return: AL = 4Fh if function supported
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AH = status
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00h successful
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ES:DI buffer filled
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01h failed
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---VBE v2.0---
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02h function not supported by current hardware configuration
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03h function invalid in current video mode
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">
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</HEAD>
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<BODY BGCOLOR="#FFD0A0">
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<h2>Int 10/AX=4F00h
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<p><img src="rbline.gif" tppabs="http://graphics.ctyme.com/gif/rbline.gif" width="100%" alt="------"><p>
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<h3><font color=#C00040>VESA SuperVGA BIOS (VBE) - GET SuperVGA INFORMATION</font></h3>
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<PRE>
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AX = 4F00h
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ES:DI -> buffer for SuperVGA information <a href="rb-0273.htm#Table77" tppabs="http://www.ctyme.com/intr/rb-0273.htm#Table77">(see #00077)</a><br>
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<p><b>Return:</b><br>AL = 4Fh if function supported
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AH = status
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00h successful
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ES:DI buffer filled
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01h failed
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---VBE v2.0---
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02h function not supported by current hardware configuration
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03h function invalid in current video mode
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</PRE>
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<p><b>Desc:</b>
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Determine whether VESA BIOS extensions are present and the capabilities
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supported by the display adapter
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<p><b>See Also:</b>
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<a href="rb-0266.htm" tppabs="http://www.ctyme.com/intr/rb-0266.htm">AX=4E00h</a> - <a href="rb-0274.htm" tppabs="http://www.ctyme.com/intr/rb-0274.htm">AX=4F01h</a> - <a href="rb-0405.htm" tppabs="http://www.ctyme.com/intr/rb-0405.htm">AX=7F00h"SOLLEX"</a> - <a href="rb-0453.htm" tppabs="http://www.ctyme.com/intr/rb-0453.htm">AX=A00
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<PRE>
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<p><b>Index:</b><br>Installation check;VESA SuperVGA
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<p>
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Format of SuperVGA information:
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<a name=table77></a>
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Offset Size Description (Table 00077)
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00h 4 BYTEs (ret) signature ("VESA")
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(call) VESA 2.0 request signature ("VBE2"), required to receive
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version 2.0 info
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04h WORD VESA version number (one-digit minor version -- 0102h = v1.2)
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06h DWORD pointer to OEM name
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"761295520" for ATI
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0Ah DWORD capabilities flags <a href="rb-0273.htm#Table78" tppabs="http://www.ctyme.com/intr/rb-0273.htm#Table78">(see #00078)</a>
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0Eh DWORD pointer to list of supported VESA and OEM video modes
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(list of words terminated with FFFFh)
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12h WORD total amount of video memory in 64K blocks
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---VBE v1.x ---
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14h 236 BYTEs reserved
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---VBE v2.0 ---
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14h WORD OEM software version (BCD, high byte = major, low byte = minor)
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16h DWORD pointer to vendor name
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1Ah DWORD pointer to product name
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1Eh DWORD pointer to product revision string
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22h WORD (if capabilities bit 3 set) VBE/AF version (BCD)
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0100h for v1.0P
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24h DWORD (if capabilities bit 3 set) pointer to list of supported
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accelerated video modes (list of words terminated with FFFFh)
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28h 216 BYTEs reserved for VBE implementation
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100h 256 BYTEs OEM scratchpad (for OEM strings, etc.)
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</PRE>
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<p><b>Notes:</b>
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The list of supported video modes is stored in the reserved portion of
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the SuperVGA information record by some implementations, and it may
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thus be necessary to either copy the mode list or use a different
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buffer for all subsequent VESA calls.
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Not all of the video modes in the list of mode numbers may be
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supported, e.g. if they require more memory than currently installed
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or are not supported by the attached monitor. Check any mode you
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intend to use through AX=4F01h first..
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The 1.1 VESA document specifies 242 reserved bytes at the end, so the
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buffer should be 262 bytes to ensure that it is not overrun; for
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v2.0, the buffer should be 512 bytes.
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The S3 specific video modes will most likely follow the FFFFh
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terminator at the end of the standard modes. A search must then
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be made to find them, FFFFh will also terminate this second list.
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In some cases, only a "stub" VBE may be present, supporting only
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AX=4F00h; this case may be assumed if the list of supported video
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modes is empty (consisting of a single word of FFFFh)
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<PRE>
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<p>
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Bitfields for VESA capabilities:
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<a name=table78></a>
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Bit(s) Description (Table 00078)
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0 DAC can be switched into 8-bit mode
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1 non-VGA controller
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2 programmed DAC with blank bit (i.e. only during blanking interval)
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3 (VBE v3.0) controller supports hardware stereoscopic signalling
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3 controller supports VBE/AF v1.0P extensions
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4 (VBE v3.0) if bit 3 set:
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=0 stereo signalling via external VESA stereo connector
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=1 stereo signalling via VESA EVC connector
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4 (VBE/AF v1.0P) must call EnableDirectAccess to access framebuffer
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5 (VBE/AF v1.0P) controller supports hardware mouse cursor
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6 (VBE/AF v1.0P) controller supports hardware clipping
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7 (VBE/AF v1.0P) controller supports transparent BitBLT
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8-31 reserved (0)
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</PRE>
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<p><b>See Also:</b>
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#00077 - <a href="rb-0286.htm" tppabs="http://www.ctyme.com/intr/rb-0286.htm">AX=4F09h</a>
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<p>
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<b>Category: <a href="cat-046.htm" tppabs="http://www.ctyme.com/intr/cat-046.htm">
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Video</a>
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- <a href="int-10.htm" tppabs="http://www.ctyme.com/intr/int-10.htm">
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Int 10h</a>
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V</a>
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<td><a href="alpha.htm" tppabs="http://www.ctyme.com/intr/alpha.htm">Contents</a></td>
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