Add emu

1 files changed, 25 insertions, 0 deletions

diff --git a/atk16_emu/test/utils.py b/atk16_emu/test/utils.py
new file mode 100644
index 0000000..0d40d54
--- /dev/null
+++ b/atk16_emu/test/utils.py
@@ -0,0 +1,25 @@
+def pad_bytearray(to_length: int, ba: bytearray) -> bytearray:
+  """
+  Pads a bytearray with zeros until it reaches a specified length.
+
+  :param to_length: Target length in bytes.
+  :param ba: The bytearray to be padded.
+  :return: The padded bytearray.
+  """
+  padding_size = to_length - len(ba)
+  if padding_size > 0:
+    ba.extend(b'\x00' * padding_size)
+  return ba
+
+def make_rom(words: list[int]) -> bytearray:
+  """
+  Constructs a ROM image from a list of 16-bit words.
+
+  :param words: The list of 16-bit words.
+  :return: The ROM image as a bytearray.
+  """
+  bytes = []
+  for word in words:
+    bytes.append((word >> 8) & 0xFF)
+    bytes.append(word & 0xFF)
+  return pad_bytearray(64 * 1024, bytearray(bytes))
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