fixed monitor memory mapping

Makefile

@@ -718,7 +718,7 @@ $(TARGET_U64CRT_X): $(SEG_LIST_U64CRT) $(CRT_BIN_LIST) build/padding_8_KB
 # $0:$A000 -  8 KB - BASIC  segment 0
 # $0:$C000 -  4 KB - KERNAL segment C
 # $0:$D000 -  4 KB - legacy mode chargen
-# $0:$E000 -  9 KB - KERNAL segment 0
+# $0:$E000 -  8 KB - KERNAL segment 0
 # $1:$0000 -  8 KB - Machine Language MONITOR
 # $1:$2000 - 56 KB - unused for now, padding