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[NTVDM]

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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
This commit is contained in:
Aleksandar Andrejevic 2016-07-24 15:45:50 +00:00
parent 493ec0db98
commit 7c0554a53f
1 changed files with 5 additions and 0 deletions
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5
reactos/subsystems/mvdm/ntvdm/bios/vidbios.c
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@ -3241,6 +3241,7 @@ VOID WINAPI VidBiosVideoService(LPWORD Stack)
/* Set the overscan register */
// VgaSetSinglePaletteRegister(VGA_AC_OVERSCAN_REG, Buffer[VGA_AC_PAL_F_REG + 1]);
IOReadB(VGA_INSTAT1_READ);
IOWriteB(VGA_AC_INDEX, VGA_AC_OVERSCAN_REG);
IOWriteB(VGA_AC_WRITE, Buffer[VGA_AC_PAL_F_REG + 1]);
@ -3255,6 +3256,8 @@ VOID WINAPI VidBiosVideoService(LPWORD Stack)
{
/* Read the old AC mode control register value */
BYTE VgaAcControlReg;
IOReadB(VGA_INSTAT1_READ);
IOWriteB(VGA_AC_INDEX, VGA_AC_CONTROL_REG);
VgaAcControlReg = IOReadB(VGA_AC_READ);
@ -3270,6 +3273,7 @@ VOID WINAPI VidBiosVideoService(LPWORD Stack)
Bda->CrtModeControl &= ~(1 << 5);
}
IOReadB(VGA_INSTAT1_READ);
IOWriteB(VGA_AC_INDEX, VGA_AC_CONTROL_REG);
IOWriteB(VGA_AC_WRITE, VgaAcControlReg);
@ -3329,6 +3333,7 @@ VOID WINAPI VidBiosVideoService(LPWORD Stack)
}
/* Get the overscan register */
IOReadB(VGA_INSTAT1_READ);
IOWriteB(VGA_AC_INDEX, VGA_AC_OVERSCAN_REG);
Buffer[VGA_AC_PAL_F_REG + 1] = IOReadB(VGA_AC_READ);