// Constructor
internal Timer8254LegacyPC(PnpConfig config, Pic pic)
{
#if VERBOSE
Tracing.Log(Tracing.Debug, "Timer8254: create");
#endif
// /pnp/08/02/01/PNP0100 0003 cfg dis : ISA 8254 Timer : AT Timer
// IRQ mask=0001 type=47
// I/O Port inf=01 min=0040 max=0040 aln=01 len=04 0040..0043
this.config = config;
this.pic = pic;
this.irq = ((IoIrqRange)config.DynamicRanges[1]).Irq;
IoPortRange ioPorts = (IoPortRange)config.DynamicRanges[0];
C0Port = ioPorts.PortAtOffset(i8254_C0, 1, Access.ReadWrite);
C2Port = ioPorts.PortAtOffset(i8254_C2, 1, Access.ReadWrite);
CWPort = ioPorts.PortAtOffset(i8254_CW, 1, Access.ReadWrite);
// Enable Timer2
// Lower 2 bits of port 61 are described in:
// The Indispensable PC Hardware Book (3rd Edition) p.724
ioPorts = (IoPortRange)config.FixedRanges[0];
IoPort p = ioPorts.PortAtOffset(0, 1, Access.ReadWrite);
//
// Also clear the NMI RAM parity error to enable the PCI card
// to generate NMI if the button is depressed
//
p.Write8((byte)((p.Read8() & 0xf8) | 0x01));
}
public OperationRegionAccessor()
{
IoPortRange pciConfigPorts = new IoPortRange(PciAddressPort, 8, Access.ReadWrite);
pciConfigAddressPort = pciConfigPorts.PortAtOffset(0, 4, Access.Write);
pciConfigDataPort = pciConfigPorts.PortAtOffset(4, 4, Access.ReadWrite);
}
// Constructor
internal Timer8254Apic(PnpConfig config)
{
// /pnp/08/02/01/PNP0100 0003 cfg dis : ISA 8254 Timer : AT Timer
// IRQ mask=0001 type=47
// I/O Port inf=01 min=0040 max=0040 aln=01 len=04 0040..0043
this.config = config;
this.irq = ((IoIrqRange)config.DynamicRanges[1]).Irq;
IoPortRange ioPorts = (IoPortRange)config.DynamicRanges[0];
C2Port = ioPorts.PortAtOffset(i8254_C2, 1, Access.ReadWrite);
CWPort = ioPorts.PortAtOffset(i8254_CW, 1, Access.ReadWrite);
// Use Timer2 as it's not connected as interrupt source.
//
// Lower 2 bits of port 61 are described in:
// The Indispensable PC Hardware Book (3rd Edition) p.724
ioPorts = (IoPortRange)config.FixedRanges[0];
IoPort p = ioPorts.PortAtOffset(0, 1, Access.ReadWrite);
//
// Also clear the NMI RAM parity error to enable the PCI card
// to generate NMI if the button is depressed
//
p.Write8((byte)((p.Read8() & 0xf8) | 0x01));
}
public Vga()
{
IoPortRange dev = new IoPortRange(0x3c0, 0x20, Access.ReadWrite);
atcAddrPort = dev.PortAtOffset(ATC_ADDR_PORT, 2, Access.ReadWrite);
miscOutputRegWritePort = dev.PortAtOffset(MISC_OUTPUT_REG_WRITE_PORT, 2, Access.ReadWrite);
seqAddrPort = dev.PortAtOffset(SEQ_ADDR_PORT, 2, Access.Write);
seqDataPort = dev.PortAtOffset(SEQ_DATA_PORT, 2, Access.ReadWrite);
dacPixelMaskPort = dev.PortAtOffset(DAC_PIXEL_MASK_PORT, 2, Access.Write);
dacAddressWritePort = dev.PortAtOffset(DAC_ADDR_WRITE_PORT, 2, Access.Write);
dacDataRegPort = dev.PortAtOffset(DAC_DATA_REG_PORT, 2, Access.Write);
graphAddrPort = dev.PortAtOffset(GRAPH_ADDR_PORT, 2, Access.Write);
graphDataPort = dev.PortAtOffset(GRAPH_DATA_PORT, 2, Access.ReadWrite);
crtcAddressColorPort = dev.PortAtOffset(CRTC_ADDR_COLOR_PORT, 2, Access.ReadWrite);
inputStatusColorPort = dev.PortAtOffset(INPUT_STATUS_COLOR_PORT, 2, Access.ReadWrite);
screenBuffer = IoMemory.AllocateIo(0xa0000, 0x20000, true, true);
textBuffer = IoMemory.AllocateIo(0xb8000, 0x8000, true, true);
}