diff --git a/bus.cpp b/bus.cpp
index 739b3d5..59aafdb 100644
--- a/bus.cpp
+++ b/bus.cpp
@@ -298,12 +298,6 @@ uint16_t bus::read(const uint16_t addr_in, const word_mode_t word_mode, const rm
 			return temp;
 		}
 
-		if (a == ADDR_KW11P) { // KW11P programmable clock
-			uint16_t temp = 128;
-			if (!peek_only) TRACE("READ-I/O programmable clock: %o", temp);
-			return temp;
-		}
-
 		if (a == ADDR_PIR || a == ADDR_PIR + 1) { // PIR
 			uint16_t temp = 0;
 
diff --git a/bus.h b/bus.h
index 325c90c..f489c8f 100644
--- a/bus.h
+++ b/bus.h
@@ -28,7 +28,6 @@
 #define ADDR_LFC  0177546  // line frequency
 #define ADDR_MAINT 0177750
 #define ADDR_CONSW 0177570
-#define ADDR_KW11P 0172540
 #define ADDR_LP11CSR 0177514  // printer
 
 #define ADDR_PSW      0177776