2

我一直在修改这个 C# 代码大约一个星期（打算与 COSMOS 操作系统一起使用）。我正在尝试进入模式 X，并将屏幕清除为某种所需的颜色。实际发生的情况是我在屏幕上出现了彩色交错的垂直条。在这些条之间通常是黑色或其他一些随机颜色。这是代码。

using System;
using Cosmos.Core;
namespace HardwareCore
{
  // This VGA driver is intended to be used with the COSMOS operating system. 
public class DirectHI
{
    public static void Test()
    {
        Console.WriteLine("Cosmos booted successfully. Type a line of text to get it echoed back.");
    }

    public static void VGAGraphicsTest()
    {
        IOPort MiscellaniousOutRegRead = new IOPort(0x3CC);
        IOPort MiscellaniousOutRegWrite = new IOPort(0x3C2);
        IOPort SequencerAddress = new IOPort(0x3C4);
        IOPort SequencerData = new IOPort(0x3C5);
        IOPort CRTCIndex = new IOPort(0x3D4);
        IOPort CRTCData = new IOPort(0x3D5);
        IOPort AttributesWrite = new IOPort(0x3C0);
        IOPort AttributesDataRead = new IOPort(0x3C1);
        IOPort ResetVCToIndex = new IOPort(0x3DA);
        IOPort GraphicsRegsAddress = new IOPort(0x3CE);
        IOPort GraphicsRegsData = new IOPort(0x3CF);

        MemoryBlock VGA = new MemoryBlock(0xA0000, 128000);

        //Hold sequencer in an async reset
        SequencerAddress.Byte = 0x00;
        SequencerData.Byte = 0x02;


        //Set Miscelanious output register
        MiscellaniousOutRegWrite.Byte = 0xE3;

        //Hold sequencer in an async reset
        SequencerAddress.Byte = 0x00;
        SequencerData.Byte = 0x02;
        //Set Clocking Mode Register
        SequencerAddress.Byte = 0x01;
        SequencerData.Byte = 0x01;

        //Set Sequencer Memory Mode
        SequencerAddress.Byte = 0x04;
        SequencerData.Byte = 0x06;

        //Unlock CRTC Registers
        CRTCIndex.Byte = 0x11;
        CRTCData.Byte = 0x00;

        //Enable the 4 Color Planes
        byte temp = ResetVCToIndex.Byte;
        AttributesWrite.Byte = 0x12;
        AttributesWrite.Byte = 0x0F;

        //setup graphics mode
        temp = ResetVCToIndex.Byte;
        AttributesWrite.Byte = 0x10;
        AttributesWrite.Byte = 0x41;

        GraphicsRegsAddress.Byte = 0x05;
        GraphicsRegsData.Byte = 0x40;

        //Set Miscelanious Graphics Register
        GraphicsRegsAddress.Byte = 0x06;
        GraphicsRegsData.Byte = 0x05;

        //Setup CRTC
        CRTCIndex.Byte = 0x17;
        CRTCData.Byte = 0xE3;

        //Set the overeflow register
        CRTCIndex.Byte = 0x08;
        CRTCData.Byte = 0x3E;

        //Unlock Sequencer
        SequencerAddress.Byte = 0x00;
        SequencerData.Byte = 0x03;

        //clear screen!

        for (uint i = 0; i < 128000; i++)
        {

                VGA[i] = (byte)(6 & 0xFF);

        }

    }

}

有没有人有什么建议？？我完全被难住了。我使用 IBM 手册作为参考以及 osdev.org 页面。

4

0 回答 0