Reduce stack usage in call16().
Tell gcc that registers are clobbered instead of using push/popal.
diff --git a/TODO b/TODO
index 08aaf91..fa01392 100644
--- a/TODO
+++ b/TODO
@@ -1,10 +1,7 @@
Find out why ubuntu compiles are failing. Find work around.
-See if it is better to tell gcc that call16 clobbers all registers
-instead of having the code call pushal/popal.
-
-The __call16 code does a long jump to the interrupt handlers - this is
-unnecessary.
+The __call16 code does a long jump to the interrupt trampolines - this
+is unnecessary.
Fix makefiles so that they rebuild the required files automatically.