emulator improvements

h8536/emulator/errors.py

@@ -0,0 +1,16 @@
+from __future__ import annotations
+
+from ..formatting import h16
+
+
+class EmulatorError(Exception):
+    pass
+
+
+class UnsupportedInstruction(EmulatorError):
+    def __init__(self, pc: int, raw: bytes, text: str) -> None:
+        raw_text = " ".join(f"{byte:02X}" for byte in raw)
+        super().__init__(f"unsupported instruction at {h16(pc)}: {raw_text} {text}".rstrip())
+        self.pc = pc
+        self.raw = raw
+        self.text = text