EightBitNet/Intel8080/Intel8080.Test/Board.cs
Adrian Conlon cd4af67177 Work my way through a bunch of the analysis suggestions.
Signed-off-by: Adrian Conlon <adrian.conlon@gmail.com>
2020-06-22 00:00:15 +01:00

107 lines
3.3 KiB
C#

// <copyright file="Board.cs" company="Adrian Conlon">
// Copyright (c) Adrian Conlon. All rights reserved.
// </copyright>
namespace Intel8080.Test
{
using EightBit;
internal class Board : Bus
{
private readonly Configuration configuration;
private readonly Ram ram;
private readonly InputOutput ports;
private readonly Disassembler disassembler;
private readonly MemoryMapping mapping;
private int warmstartCount = 0;
public Board(Configuration configuration)
{
this.configuration = configuration;
this.ram = new Ram(0x10000);
this.ports = new InputOutput();
this.CPU = new Intel8080(this, this.ports);
this.disassembler = new Disassembler(this);
this.mapping = new MemoryMapping(this.ram, 0x0000, (ushort)Mask.Sixteen, AccessLevel.ReadWrite);
}
public Intel8080 CPU { get; }
public override void RaisePOWER()
{
base.RaisePOWER();
this.CPU.RaisePOWER();
this.CPU.RaiseRESET();
this.CPU.RaiseINT();
}
public override void LowerPOWER()
{
this.CPU.LowerPOWER();
base.LowerPOWER();
}
public override void Initialize()
{
var programPath = this.configuration.RomDirectory + "/" + this.configuration.Program;
var loadAddress = this.configuration.LoadAddress;
this.ram.Load(programPath, loadAddress.Word);
this.CPU.LoweredHALT += this.CPU_LoweredHALT;
this.CPU.ExecutingInstruction += this.CPU_ExecutingInstruction_CPM;
if (this.configuration.DebugMode)
{
this.CPU.ExecutingInstruction += this.CPU_ExecutingInstruction_Debug;
}
this.Poke(0, 0xc3); // JMP
this.CPU.PokeWord(1, this.configuration.StartAddress);
this.Poke(5, 0xc9); // ret
}
public override MemoryMapping Mapping(ushort absolute) => this.mapping;
private void BDOS()
{
switch (this.CPU.C)
{
case 0x2:
System.Console.Out.Write((char)this.CPU.E);
break;
case 0x9:
for (var i = this.CPU.DE.Word; this.Peek(i) != '$'; ++i)
{
System.Console.Out.Write((char)this.Peek(i));
}
break;
}
}
private void CPU_ExecutingInstruction_CPM(object sender, System.EventArgs e)
{
switch (this.CPU.PC.Word)
{
case 0x0: // CP/M warm start
if (++this.warmstartCount == 2)
{
this.LowerPOWER();
}
break;
case 0x5: // BDOS
this.BDOS();
break;
default:
break;
}
}
private void CPU_LoweredHALT(object sender, System.EventArgs e) => this.LowerPOWER();
private void CPU_ExecutingInstruction_Debug(object sender, System.EventArgs e) => System.Console.Error.WriteLine($"{EightBit.Disassembler.State(this.CPU)}\t{this.disassembler.Disassemble(this.CPU)}");
}
}