diff options
Diffstat (limited to 'Chip/Q1Cpu.cs')
| -rw-r--r-- | Chip/Q1Cpu.cs | 156 |
1 files changed, 0 insertions, 156 deletions
diff --git a/Chip/Q1Cpu.cs b/Chip/Q1Cpu.cs deleted file mode 100644 index eefc61c..0000000 --- a/Chip/Q1Cpu.cs +++ /dev/null @@ -1,156 +0,0 @@ -using System; - -namespace Q1Emu.Chip; - -using System.Collections.Generic; -using Assembler; - -public partial class Q1Cpu -{ - public const u16 StackStart = 0x2FFF; - public const u16 StackLength = 16 * 2; // 16 16-bit values - - public Random Random; - - public u16 AX = 0; // Accumulator register - public u16 DX = 0; // Data register - public u16 LX = 0; // Logical register - - public u16 SP { get; set; } // Stack pointer - public u16 PC { get; set; } // Program counter - - public u16[] V { get; set; } // Variable registers (64 total) - public u16 I { get; set; } // Index register - public u16 Cycles { get; set; } // Number of cycles - - public Bus Bus { get; set; } - - public Q1Cpu() - { - this.LoadInstructionLookup(); - - this.Reset(); - } - - public void Reset() - { - this.V = new u16[16]; - - this.SP = StackStart; - - this.I = 0; - } - - public void Clock() - { - var pc = this.PC; - u16 instruction = this.FetchInstruction(out u8 op, out u8 m1, out u8 m2, out _); - Console.WriteLine($"CPU.Clock: {pc:X4} | {Disassembler.ParseInstruction(instruction)}"); - // Console.WriteLine($"{V[0]:X4} {V[1]:X4} {V[2]:X4} {V[3]:X4} {V[4]:X4} {V[5]:X4} {V[6]:X4} {V[7]:X4}"); - - bool ex = m2 > 0; - switch (m1, ex) - { - case (0x00, false): - this.InstructionLookup[op].Item1(); // Implicit - break; - case (> 0x00, false): - this.InstructionLookup[op].Item2(m1); // Simple addressing mode - break; - case (0x00, true): - this.InstructionLookup[op].Item3(); // Extended implicit - break; - case (> 0x00, true): - this.InstructionLookup[op].Item4(m1, m2); // Extended addressing mode - break; - } - - this.Cycles++; - } - public u16 FetchInstruction(out u8 op, out u8 m1, out u8 m2, out u8 length) - { - u16 instruction = this.Bus.ReadWord(this.PC); - this.PC += 2; - - op = (u8) ((instruction >> 8) & 0xFF); // 256 opcodes - m1 = (u8) ((instruction >> 4) & 0x0F); // 16 modes - m2 = (u8) (instruction & 0x0F); // 16 modes - - length = (u8) (this.AddressingModeLength(m1) + this.AddressingModeLength(m2)); - return instruction; - } - - private void PushStack(u16 value) - { - if (this.SP + 2 >= StackStart + StackLength) - throw new InvalidOperationException("Stack overflow"); - - this.Bus.WriteWord(this.SP, value); - this.SP += 2; - } - - private u16 PopStack() - { - if (this.SP - 2 < StackStart) - throw new InvalidOperationException("Stack underflow"); - - this.SP -= 2; - return this.Bus.ReadWord(this.SP); - } - - private u16 FetchRegister(u8 regIndex) - { - return regIndex switch - { - <= 0x3F => this.V[regIndex], - - 0x40 => this.AX, - 0x41 => (u16) (this.AX >> 8), // High byte of AX - 0x42 => (u16) (this.AX & 0xFF), // Low byte of AX - - 0x43 => this.DX, - 0x44 => (u16) (this.DX >> 8), // High byte of DX - 0x45 => (u16) (this.DX & 0xFF), // Low byte of DX - - 0x46 => this.LX, - 0x50 => this.PC, - 0x51 => this.SP, - - _ => throw new InvalidOperationException($"Unknown register index: {regIndex:X2}"), - }; - } - - private void StoreRegister(u8 regIndex, u16 value) - { - switch (regIndex) - { - case <= 0x3F: - this.V[regIndex] = value; - break; - - case 0x40: - this.AX = value; break; - case 0x41: - this.AX = (u16) ((this.AX & 0x00FF) | (value << 8)); break; // Set high byte - case 0x42: - this.AX = (u16) ((this.AX & 0xFF00) | (value & 0x00FF)); break; // Set low byte - - case 0x43: - this.DX = value; break; - case 0x44: - this.DX = (u16) ((this.DX & 0x00FF) | (value << 8)); break; // Set high byte - case 0x45: - this.DX = (u16) ((this.DX & 0xFF00) | (value & 0x00FF)); break; // Set low byte - - case 0x46: - this.LX = value; break; - case 0x50: - this.PC = value; break; - case 0x51: - this.SP = value; break; - - default: - throw new InvalidOperationException($"Unknown register index: {regIndex:X2}"); - } - } -}
\ No newline at end of file |