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[NTVDM]
Always reset the AC latch before writing to the AC index register. CORE-11669 #resolve #comment Should be fixed in revision r71990. svn path=/trunk/; revision=71990
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@ -3241,6 +3241,7 @@ VOID WINAPI VidBiosVideoService(LPWORD Stack)
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/* Set the overscan register */
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/* Set the overscan register */
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// VgaSetSinglePaletteRegister(VGA_AC_OVERSCAN_REG, Buffer[VGA_AC_PAL_F_REG + 1]);
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// VgaSetSinglePaletteRegister(VGA_AC_OVERSCAN_REG, Buffer[VGA_AC_PAL_F_REG + 1]);
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IOReadB(VGA_INSTAT1_READ);
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IOWriteB(VGA_AC_INDEX, VGA_AC_OVERSCAN_REG);
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IOWriteB(VGA_AC_INDEX, VGA_AC_OVERSCAN_REG);
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IOWriteB(VGA_AC_WRITE, Buffer[VGA_AC_PAL_F_REG + 1]);
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IOWriteB(VGA_AC_WRITE, Buffer[VGA_AC_PAL_F_REG + 1]);
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@ -3255,6 +3256,8 @@ VOID WINAPI VidBiosVideoService(LPWORD Stack)
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{
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{
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/* Read the old AC mode control register value */
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/* Read the old AC mode control register value */
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BYTE VgaAcControlReg;
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BYTE VgaAcControlReg;
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IOReadB(VGA_INSTAT1_READ);
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IOWriteB(VGA_AC_INDEX, VGA_AC_CONTROL_REG);
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IOWriteB(VGA_AC_INDEX, VGA_AC_CONTROL_REG);
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VgaAcControlReg = IOReadB(VGA_AC_READ);
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VgaAcControlReg = IOReadB(VGA_AC_READ);
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@ -3270,6 +3273,7 @@ VOID WINAPI VidBiosVideoService(LPWORD Stack)
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Bda->CrtModeControl &= ~(1 << 5);
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Bda->CrtModeControl &= ~(1 << 5);
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}
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}
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IOReadB(VGA_INSTAT1_READ);
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IOWriteB(VGA_AC_INDEX, VGA_AC_CONTROL_REG);
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IOWriteB(VGA_AC_INDEX, VGA_AC_CONTROL_REG);
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IOWriteB(VGA_AC_WRITE, VgaAcControlReg);
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IOWriteB(VGA_AC_WRITE, VgaAcControlReg);
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@ -3329,6 +3333,7 @@ VOID WINAPI VidBiosVideoService(LPWORD Stack)
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}
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}
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/* Get the overscan register */
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/* Get the overscan register */
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IOReadB(VGA_INSTAT1_READ);
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IOWriteB(VGA_AC_INDEX, VGA_AC_OVERSCAN_REG);
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IOWriteB(VGA_AC_INDEX, VGA_AC_OVERSCAN_REG);
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Buffer[VGA_AC_PAL_F_REG + 1] = IOReadB(VGA_AC_READ);
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Buffer[VGA_AC_PAL_F_REG + 1] = IOReadB(VGA_AC_READ);
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