Start by bin creator and disassembler

2 files changed, 43 insertions, 0 deletions

diff --git a/nandgame/assembler/createbin.py b/nandgame/assembler/createbin.py
new file mode 100755
index 0000000..d4a2e7a
--- /dev/null
+++ b/nandgame/assembler/createbin.py
@@ -0,0 +1,14 @@
+#!/usr/bin/env python3
+
+
+with open("allins.bin", "wb") as f:
+    ins=0x0000
+    # ldi A, 0
+    f.write(ins.to_bytes(2))
+
+    ins=0x00ff
+    # ldi A, 255
+    f.write(ins.to_bytes(2))
+
+    for ins in range(0x8000, 0xffff + 1):
+        f.write(ins.to_bytes(2))
diff --git a/nandgame/assembler/disas.py b/nandgame/assembler/disas.py
new file mode 100755
index 0000000..a68acf4
--- /dev/null
+++ b/nandgame/assembler/disas.py
@@ -0,0 +1,29 @@
+#!/usr/bin/env python3
+
+import sys
+
+if len(sys.argv) != 2:
+    print(f"Usage: {sys.argv[0]} [filename]")
+    sys.exit(1)
+
+def decode(ins: int) -> str:
+    if (ins & 0x8000 == 0):
+        # mov? ldr? ldi? aaaaaaaaaaa....
+        return f"mov A, #{ins}"
+    else:
+        return "<unknown>"
+
+try:
+    with open(sys.argv[1], "rb") as f:
+        while True:
+            insb = f.read(2)
+            if not insb: break
+            ins = int.from_bytes(insb)
+            print(f"\t{insb[0]:02x} {insb[1]:02x}\t{decode(ins)}")
+
+except FileNotFoundError:
+    print(f"File not found.")
+    sys.exit(1)
+# head, tail...
+except BrokenPipeError:
+    sys.exit(0)