From 71ce42495607b141db37a224cc68e2f600dae376 Mon Sep 17 00:00:00 2001
From: Kyler <59854022+KylerOlsen@users.noreply.github.com>
Date: Mon, 5 Feb 2024 00:16:49 -0700
Subject: [PATCH] Started emulator

---
 emulator/main.py | 250 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 250 insertions(+)
 create mode 100644 emulator/main.py

diff --git a/emulator/main.py b/emulator/main.py
new file mode 100644
index 0000000..87099e0
--- /dev/null
+++ b/emulator/main.py
@@ -0,0 +1,250 @@
+# Kyler Olsen
+# Feb 2024
+
+MAX_INT = 4089
+
+
+class Memory:
+
+    def __getitem__(self, index: int) -> int:
+        return 0
+
+    def __setitem__(self, index: int, value: int):
+        pass
+
+
+class Computer:
+
+    _mem: Memory
+
+    _running: bool
+    _halted: bool
+
+    _zero_flag: bool
+    _interrupt_flag: list[int]
+
+    _pc: int
+    _sp: int
+    _pt: int
+    _d0: int
+    _d1: int
+    _d2: int
+    _d3: int
+
+    _interrupt_map: list[int]
+
+    def __init__(self, mem: Memory):
+        self._mem = mem
+
+        self._running = True
+        self._halted = False
+        self._zero_flag = False
+        self._interrupt_flag = []
+
+        self._pc = 0
+        self._sp = 0
+        self._pt = 0
+        self._d0 = 0
+        self._d1 = 0
+        self._d2 = 0
+        self._d3 = 0
+
+        self._interrupt_map = [0] * MAX_INT
+
+    @property
+    def running(self) -> bool: return self._running
+    @property
+    def halted(self) -> bool: return self._halted
+    @property
+    def active(self) -> bool: return self.running and self.halted
+
+    @property
+    def zero_flag(self) -> bool: return self._zero_flag
+
+    @property
+    def program_counter(self) -> int: return self._pc
+    @program_counter.setter
+    def program_counter(self, value: int): self._pc = value % MAX_INT
+    @property
+    def stack_pointer(self) -> int: return self._sp
+    @stack_pointer.setter
+    def stack_pointer(self, value: int): self._sp = value % MAX_INT
+    @property
+    def pointer(self) -> int: return self._pt
+    @pointer.setter
+    def pointer(self, value: int): self._pt = value % MAX_INT
+    @property
+    def data_0(self) -> int: return self._d0
+    @data_0.setter
+    def data_0(self, value: int): self._d0 = value % MAX_INT
+    @property
+    def data_1(self) -> int: return self._d1
+    @data_1.setter
+    def data_1(self, value: int): self._d1 = value % MAX_INT
+    @property
+    def data_2(self) -> int: return self._d2
+    @data_2.setter
+    def data_2(self, value: int): self._d2 = value % MAX_INT
+    @property
+    def data_3(self) -> int: return self._d3
+    @data_3.setter
+    def data_3(self, value: int): self._d3 = value % MAX_INT
+
+    def get_reg(
+        self,
+        index: int,
+        *,
+        top: bool = False,
+        strict: bool = False,
+    ) -> int:
+        if strict and not (0 <= index <= 7): raise IndexError
+        elif strict and top and not (0 <= index <= 3): raise IndexError
+        elif top and not (0 <= index <= 3): index = (index % 4) + 4
+        else: index %= 8
+
+        return self._get_reg(index)
+
+    def _get_reg(self, index: int) -> int:
+        if index == 1: return self._pc
+        elif index == 2: return self._sp
+        elif index == 3: return self._pt
+        elif index == 4: return self._d0
+        elif index == 5: return self._d1
+        elif index == 6: return self._d2
+        elif index == 7: return self._d3
+        else: return 0
+
+    def set_reg(
+        self,
+        index: int,
+        value: int,
+        *,
+        top: bool = False,
+        strict: bool = False,
+    ):
+        if strict and not (0 <= index <= 7): raise IndexError
+        elif strict and top and not (0 <= index <= 3): raise IndexError
+        elif top and not (0 <= index <= 3): index = (index % 4) + 4
+        else: index %= 8
+
+        value %= MAX_INT
+
+        self._set_reg(index, value)
+
+    def _set_reg(self, index: int, value: int):
+        if index == 1: self._pc = value
+        elif index == 2: self._sp = value
+        elif index == 3: self._pt = value
+        elif index == 4: self._d0 = value
+        elif index == 5: self._d1 = value
+        elif index == 6: self._d2 = value
+        elif index == 7: self._d3 = value
+
+    def interrupt(self, index: int):
+        self._interrupt_flag.append(index % MAX_INT)
+
+    # === Operations ===
+
+    def NOP(self):
+        self.program_counter += 1
+
+    def HLT(self):
+        self._halted = True
+        self.program_counter += 1
+
+    def INT(self):
+        self.interrupt(self.pointer)
+        self.program_counter += 1
+
+    def JPZ(self):
+        if self.zero_flag:
+            self.program_counter = self.pointer
+        self.program_counter += 1
+
+    def SET(self, REG: int):
+        self._interrupt_map[self.pointer] = self.get_reg(REG, top=True)
+        self.program_counter += 1
+
+    def LOD(self, REG: int):
+        self.set_reg(REG, self._mem[self.pointer], top=True)
+        self.program_counter += 1
+
+    def STR(self, REG: int):
+        self._mem[self.pointer] = self.get_reg(REG, top=True)
+        self.program_counter += 1
+
+    def PSH(self, REG: int):
+        self.set_reg(REG, self._mem[self.stack_pointer])
+        self.program_counter += 1
+
+    def POP(self, REG: int):
+        self._mem[self.stack_pointer] = self.get_reg(REG)
+        self.program_counter += 1
+
+    def LSH(self, REG_D: int, REG_A: int):
+        result = self.get_reg(REG_A) << 1
+        result %= MAX_INT
+        self._zero_flag = result == 0
+        self.set_reg(REG_D, result, top=True)
+        self.program_counter += 1
+
+    def RSH(self, REG_D: int, REG_A: int):
+        result = self.get_reg(REG_A) >> 1
+        result %= MAX_INT
+        self._zero_flag = result == 0
+        self.set_reg(REG_D, result)
+        self.program_counter += 1
+
+    def INC(self, REG_D: int, REG_A: int):
+        result = self.get_reg(REG_A) + 1
+        result %= MAX_INT
+        self._zero_flag = result == 0
+        self.set_reg(REG_D, result)
+        self.program_counter += 1
+
+    def DEC(self, REG_D: int, REG_A: int):
+        result = self.get_reg(REG_A) - 1
+        result %= MAX_INT
+        self._zero_flag = result == 0
+        self.set_reg(REG_D, result)
+        self.program_counter += 1
+
+    def AND(self, REG_D: int, REG_A: int, REG_B: int):
+        result = self.get_reg(REG_A) & self.get_reg(REG_B, top=True)
+        result %= MAX_INT
+        self._zero_flag = result == 0
+        self.set_reg(REG_D, result, top=True)
+        self.program_counter += 1
+
+    def XOR(self, REG_D: int, REG_A: int, REG_B: int):
+        result = self.get_reg(REG_A) ^ self.get_reg(REG_B, top=True)
+        result %= MAX_INT
+        self._zero_flag = result == 0
+        self.set_reg(REG_D, result, top=True)
+        self.program_counter += 1
+
+    def NOR(self, REG_D: int, REG_A: int, REG_B: int):
+        result = MAX_INT ^ (self.get_reg(REG_A) | self.get_reg(REG_B))
+        result %= MAX_INT
+        self._zero_flag = result == 0
+        self.set_reg(REG_D, result)
+        self.program_counter += 1
+
+    def SUB(self, REG_D: int, REG_A: int, REG_B: int):
+        result = self.get_reg(REG_A) - self.get_reg(REG_B)
+        result %= MAX_INT
+        self._zero_flag = result == 0
+        self.set_reg(REG_D, result)
+        self.program_counter += 1
+
+    def ADD(self, REG_D: int, REG_A: int, REG_B: int):
+        result = self.get_reg(REG_A) + self.get_reg(REG_B)
+        result %= MAX_INT
+        self._zero_flag = result == 0
+        self.set_reg(REG_D, result)
+        self.program_counter += 1
+
+    def LDI(self, REG: int, Immediate: int):
+        self.set_reg(REG, Immediate)
+        self.program_counter += 1
+