90 lines
2.3 KiB
C#
90 lines
2.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace BizHawk.Emulation.Consoles.Intellivision
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{
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public sealed partial class Intellivision
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{
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private ushort[] STIC_Registers = new ushort[64];
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private ushort[] Scratchpad_RAM = new ushort[240];
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private ushort[] PSG_Registers = new ushort[16];
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private ushort[] System_RAM = new ushort[352];
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private ushort[] Executive_ROM = new ushort[4096];
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private ushort[] Graphics_ROM = new ushort[2048];
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private ushort[] Graphics_RAM = new ushort[512];
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public ushort ReadMemory(ushort addr)
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{
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ushort? cart = ReadCart(addr);
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ushort core;
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switch (addr & 0xF000)
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{
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case 0x0000:
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if (addr >= 0x0100 && addr <= 0x01EF)
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core = Scratchpad_RAM[addr & 0x00EF];
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else if (addr >= 0x01F0 && addr <= 0x01FF)
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core = PSG_Registers[addr & 0x000F];
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else if (addr >= 0x0200 && addr <= 0x035F)
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core = System_RAM[addr & 0x015F];
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else
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throw new NotImplementedException();
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break;
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case 0x1000:
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core = Executive_ROM[addr & 0x0FFF];
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break;
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case 0x3000:
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if (addr >= 0x3000 && addr <= 0x37FF)
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core = Graphics_ROM[addr & 0x07FF];
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else if (addr >= 0x3800 && addr <= 0x39FF)
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core = Graphics_RAM[addr & 0x01FF];
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else
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throw new NotImplementedException();
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break;
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default:
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throw new NotImplementedException();
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}
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if (cart != null)
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return (ushort)cart;
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return core;
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}
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public void WriteMemory(ushort addr, ushort value)
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{
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WriteCart(addr, value);
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switch (addr & 0xF000)
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{
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case 0x0000:
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if (addr >= 0x0100 && addr <= 0x01EF)
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{
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Scratchpad_RAM[addr & 0x00EF] = value;
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break;
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}
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else if (addr >= 0x01F0 && addr <= 0x01FF)
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{
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PSG_Registers[addr & 0x000F] = value;
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break;
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}
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else if (addr >= 0x0200 && addr <= 0x035F)
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{
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System_RAM[addr & 0x015F] = value;
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break;
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}
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else
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throw new NotImplementedException();
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case 0x3000:
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if (addr >= 0x3800 && addr <= 0x39FF)
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{
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Graphics_RAM[addr & 0x01FF] = value;
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break;
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}
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else
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throw new NotImplementedException();
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default:
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throw new NotImplementedException();
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}
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}
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}
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}
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