/// <summary>
/// Sets DAC color registers to values in emulated RAM.
/// </summary>
private void SetDacRegisters()
{
ushort segment = VirtualMachine.Processor.ES;
uint offset = (ushort)VirtualMachine.Processor.DX;
int start = VirtualMachine.Processor.BX;
int count = VirtualMachine.Processor.CX;
for (int i = start; i < count; i++)
{
byte r = VirtualMachine.PhysicalMemory.GetByte(segment, offset);
byte g = VirtualMachine.PhysicalMemory.GetByte(segment, offset + 1u);
byte b = VirtualMachine.PhysicalMemory.GetByte(segment, offset + 2u);
Dac.SetColor((byte)(start + i), r, g, b);
offset += 3u;
}
}
void IInterruptHandler.HandleInterrupt(int interrupt)
{
switch (VirtualMachine.Processor.AH)
{
case 0x4F:
this.vbe.HandleFunction();
break;
case Functions.GetDisplayMode:
VirtualMachine.Processor.AH = VirtualMachine.PhysicalMemory.Bios.ScreenColumns;
VirtualMachine.Processor.AL = (byte)VirtualMachine.PhysicalMemory.Bios.VideoMode;
break;
case Functions.ScrollUpWindow:
//if(vm.Processor.AL == 0)
// textDisplay.Clear();
//else
{
byte foreground = (byte)((VirtualMachine.Processor.BX >> 8) & 0x0F);
byte background = (byte)((VirtualMachine.Processor.BX >> 12) & 0x0F);
TextConsole.ScrollTextUp(VirtualMachine.Processor.CL, VirtualMachine.Processor.CH, VirtualMachine.Processor.DL, VirtualMachine.Processor.DH, VirtualMachine.Processor.AL, foreground, background);
}
break;
case Functions.EGA:
switch (VirtualMachine.Processor.BL)
{
case Functions.EGA_GetInfo:
VirtualMachine.Processor.BX = 0x03; // 256k installed
VirtualMachine.Processor.CX = 0x09; // EGA switches set
break;
case Functions.EGA_SelectVerticalResolution:
if (VirtualMachine.Processor.AL == 0)
{
this.verticalTextResolution = 8;
}
else if (VirtualMachine.Processor.AL == 1)
{
this.verticalTextResolution = 14;
}
else
{
this.verticalTextResolution = 16;
}
VirtualMachine.Processor.AL = 0x12; // Success
break;
case Functions.EGA_PaletteLoading:
this.defaultPaletteLoading = VirtualMachine.Processor.AL == 0;
break;
default:
System.Diagnostics.Debug.WriteLine(string.Format("Video command {0:X2}, BL={1:X2}h not implemented.", Functions.EGA, VirtualMachine.Processor.BL));
break;
}
break;
case Functions.ReadCharacterAndAttributeAtCursor:
VirtualMachine.Processor.AX = (short)TextConsole.GetCharacter(TextConsole.CursorPosition.X, TextConsole.CursorPosition.Y);
break;
case Functions.WriteCharacterAndAttributeAtCursor:
TextConsole.Write(VirtualMachine.Processor.AL, (byte)(VirtualMachine.Processor.BL & 0x0F), (byte)(VirtualMachine.Processor.BL >> 4), false);
break;
case Functions.WriteCharacterAtCursor:
TextConsole.Write(VirtualMachine.Processor.AL);
break;
case Functions.GetDisplayCombinationCode:
VirtualMachine.Processor.AL = 0x1A;
VirtualMachine.Processor.BX = 0x0008;
break;
case Functions.SetDisplayMode:
SetDisplayMode((VideoMode10)VirtualMachine.Processor.AL);
break;
case Functions.SetCursorPosition:
TextConsole.CursorPosition = new Point(VirtualMachine.Processor.DL, VirtualMachine.Processor.DH);
break;
case Functions.SetCursorShape:
SetCursorShape(VirtualMachine.Processor.CH, VirtualMachine.Processor.CL);
break;
case Functions.SelectActiveDisplayPage:
this.CurrentMode.ActiveDisplayPage = VirtualMachine.Processor.AL;
break;
case Functions.Palette:
switch (VirtualMachine.Processor.AL)
{
case Functions.Palette_SetSingleRegister:
SetEgaPaletteRegister(VirtualMachine.Processor.BL, VirtualMachine.Processor.BH);
break;
case Functions.Palette_SetBorderColor:
// Ignore for now.
break;
case Functions.Palette_SetAllRegisters:
SetAllEgaPaletteRegisters();
break;
case Functions.Palette_ReadSingleDacRegister:
// These are commented out because they cause weird issues sometimes.
//vm.Processor.DH = (byte)((dac.Palette[vm.Processor.BL] >> 18) & 0xCF);
//vm.Processor.CH = (byte)((dac.Palette[vm.Processor.BL] >> 10) & 0xCF);
//vm.Processor.CL = (byte)((dac.Palette[vm.Processor.BL] >> 2) & 0xCF);
break;
case Functions.Palette_SetSingleDacRegister:
Dac.SetColor(VirtualMachine.Processor.BL, VirtualMachine.Processor.DH, VirtualMachine.Processor.CH, VirtualMachine.Processor.CL);
break;
case Functions.Palette_SetDacRegisters:
SetDacRegisters();
break;
case Functions.Palette_ReadDacRegisters:
ReadDacRegisters();
break;
case Functions.Palette_ToggleBlink:
// Blinking is not emulated.
break;
case Functions.Palette_SelectDacColorPage:
System.Diagnostics.Debug.WriteLine("Select DAC color page");
break;
default:
throw new NotImplementedException(string.Format("Video command 10{0:X2}h not implemented.", VirtualMachine.Processor.AL));
}
break;
case Functions.GetCursorPosition:
VirtualMachine.Processor.CH = 14;
VirtualMachine.Processor.CL = 15;
VirtualMachine.Processor.DH = (byte)TextConsole.CursorPosition.Y;
VirtualMachine.Processor.DL = (byte)TextConsole.CursorPosition.X;
break;
case Functions.TeletypeOutput:
TextConsole.Write(VirtualMachine.Processor.AL);
break;
case Functions.GetFunctionalityInfo:
GetFunctionalityInfo();
break;
case 0xEF:
VirtualMachine.Processor.DX = -1;
break;
case 0xFE:
break;
case Functions.Font:
switch (VirtualMachine.Processor.AL)
{
case Functions.Font_GetFontInfo:
GetFontInfo();
break;
case Functions.Font_Load8x8:
SwitchTo80x50TextMode();
break;
case Functions.Font_Load8x16:
break;
default:
throw new NotImplementedException(string.Format("Video command 11{0:X2}h not implemented.", VirtualMachine.Processor.AL));
}
break;
default:
System.Diagnostics.Debug.WriteLine(string.Format("Video command {0:X2}h not implemented.", VirtualMachine.Processor.AH));
break;
}
}