220 lines
13 KiB
HTML
220 lines
13 KiB
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<TITLE>Int 10/AH=1Ch
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<META NAME="Description" CONTENT="
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Int 10/AH=1Ch - VIDEO - SAVE/RESTORE VIDEO STATE (PS50+,VGA) -
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AH = 1Ch
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AL = function
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00h return state buffer size
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Return: BX = number of 64-byte blocks needed
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01h save video state
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ES:BX - buffer
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02h restore video state
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ES:BX - buffer containing previously saved state
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CX = requested states (see #00048)
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Return: AL = 1Ch if function supported
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<h2>Int 10/AH=1Ch
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<h3><font color=#C00040>VIDEO - SAVE/RESTORE VIDEO STATE (PS50+,VGA)</font></h3>
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<PRE>
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AH = 1Ch
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AL = function
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00h return state buffer size
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<p><b>Return:</b><br>BX = number of 64-byte blocks needed
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01h save video state
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ES:BX -> buffer
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02h restore video state
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ES:BX -> buffer containing previously saved state.
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CX = requested states <a href="rb-0222.htm#Table48" tppabs="http://www.ctyme.com/intr/rb-0222.htm#Table48">(see #00048)</a><br>
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<p><b>Return:</b><br>AL = 1Ch if function supported
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</PRE>
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<p><b>Notes:</b>
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Many BIOSes corrupt the video registers when saving the state, so a
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program should restore the state immediately after saving it (the
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saved data is uncorrupted).
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The BIOS data area consists of the 96 bytes from 0040h:0049h-00A8h.
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This function is not supported when DOS/V is running.
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This function may be a better VGA installation check than the usual
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INT 10/AX=1A00h, since some late-model EGA cards (such as the ATI
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EGA Wonder) supported that call
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<p><b>See Also:</b>
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<a href="rb-0219.htm" tppabs="http://www.ctyme.com/intr/rb-0219.htm">AX=1A00h</a> - <a href="rb-0358.htm" tppabs="http://www.ctyme.com/intr/rb-0358.htm">AX=5F90h</a> - <a href="rb-0361.htm" tppabs="http://www.ctyme.com/intr/rb-0361.htm">AX=5FA0h</a> - MEM 0040h:00A8h
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<PRE>
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<p>
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Bitfields for requested states:
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<a name=table48></a>
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Bit(s) Description (Table 00048)
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0 video hardware <a href="rb-0222.htm#Table49" tppabs="http://www.ctyme.com/intr/rb-0222.htm#Table49">(see #00049)</a>
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1 BIOS data areas
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2 color registers and DAC state <a href="rb-0222.htm#Table50" tppabs="http://www.ctyme.com/intr/rb-0222.htm#Table50">(see #00050)</a>
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3-15 unused (0)
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</PRE>
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<p><b>See Also:</b>
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#00186
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<PRE>
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<p>
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Format of VGA video hardware state:
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<a name=table49></a>
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Offset Size Description (Table 00049)
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00h BYTE sequencer index register
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01h BYTE CRTC index register
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02h BYTE graphics controller index register
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03h BYTE attribute controller index register
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04h BYTE feature controller register
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05h 4 BYTEs sequencer registers
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09h BYTE sequencer register 0
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0Ah 25 BYTEs CRTC registers 0-8
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23h 16 BYTEs palette registers 00h-0Fh
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33h 4 BYTEs attribute registers 10h-13h
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37h 9 BYTEs graphics controller registers 0-8
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40h BYTE CRTC base address (low)
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41h BYTE CRTC base address (high)
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42h BYTE plane 0 latch
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43h BYTE plane 1 latch
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44h BYTE plane 2 latch
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45h BYTE plane 3 latch
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<p>
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Format of VGA DAC state:
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<a name=table50></a>
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Offset Size Description (Table 00050)
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00h BYTE read/write mode DAC
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01h BYTE pixel address
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02h BYTE pixel mask
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03h 768 BYTEs color data (256 triples)
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303h BYTE color select register
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</PRE>
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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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