diff --git a/Machines/Enterprise/EXOSCodes.hpp b/Machines/Enterprise/EXOSCodes.hpp
index bddb7b1b4..470db33dd 100644
--- a/Machines/Enterprise/EXOSCodes.hpp
+++ b/Machines/Enterprise/EXOSCodes.hpp
@@ -25,7 +25,7 @@ enum class Function: uint8_t {
 	ReadBlock = 6,					// RDBLK
 	WriteCharacter = 7,				// WRCH
 	WriteBlock = 8,					// WRBLK
-	ReadStatus = 9,					// RSTAT
+	ReadChannelStatus = 9,			// RSTAT
 	SetChannelStatus = 10,			// SSTAT
 	SpecialFunction = 11,			// SFUNC
 
@@ -44,6 +44,16 @@ enum class Function: uint8_t {
 	ReturnErrorMessage = 28,		// ERRMSG
 };
 
+// Page 25.
+enum class DeviceDescriptorFunction: uint8_t {
+	//
+	// Codes are the same as `Function` in the range 1–11.
+	//
+	Interrupt = 0,
+	Initialise = 12,
+	BufferMoved = 13,
+};
+
 // Pages 68–70.
 enum class Error: uint8_t {
 	//