added todo-vhdl.txt

diff --git a/cpu/todo-vhdl.txt b/cpu/todo-vhdl.txt
new file mode 100644 (file)
index 0000000..deb56da
--- /dev/null
+++ b/cpu/todo-vhdl.txt
@@ -0,0 +1,5 @@
+- ldi/ldh
+- sign extension displacement ldw, stw
+- stack op
+- br reg
+-