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-rw-r--r--baremetal/400.mu5
1 files changed, 5 insertions, 0 deletions
diff --git a/baremetal/400.mu b/baremetal/400.mu
index 016204c5..f25e13a3 100644
--- a/baremetal/400.mu
+++ b/baremetal/400.mu
@@ -1,3 +1,8 @@
 sig pixel screen: (addr screen), x: int, y: int, color: int
 sig read-key kbd: (addr keyboard) -> _/eax: byte
 sig draw-grapheme screen: (addr screen), g: grapheme, x: int, y: int, color: int
+
+sig write f: (addr stream byte), s: (addr array byte)
+sig append-byte f: (addr stream byte), n: int
+sig read-byte s: (addr stream byte) -> _/eax: byte
+sig stream-empty? s: (addr stream _) -> _/eax: boolean