diff --git a/CHANGES b/CHANGES
index 56c468d..f39545b 100644
--- a/CHANGES
+++ b/CHANGES
@@ -8,6 +8,23 @@ The following are the changes from calc version 2.12.6.6 to date:
     Added work around for a gcc warning bug, thanks to a report by Mike
     <michael dot d dot ince at gmail dot com>.
 
+    Fixed errors in various help files such as:
+
+	mat randbit seed srandom types
+
+    Removed the MAXSTRING symbol because it was no longer used by calc.
+
+    Increased HIST_SIZE (depth of the history stack) from 10k to 32k.
+
+    Increased TTYSIZE (reallocation size for terminal buffers) from 100 to 8191.
+
+    Increased MAXDEPTH (maximum depth of input stack) from 10 to 255.
+
+    Increased interactive input buffer size from 1024 to 256k.  This has the
+    effect of increasing the maximum length of an input line from a tty.
+    This helps with an interactive bug that was reported by Ruslan Kabatsayev
+    (b7 dot 10110111 at gmail dot com).
+
 
 The following are the changes from calc version 2.12.6.4 to 2.12.6.5:
 
diff --git a/Makefile.ship b/Makefile.ship
index 5be48ba..16c203f 100644
--- a/Makefile.ship
+++ b/Makefile.ship
@@ -1054,7 +1054,7 @@ EXT=
 
 # The default calc versions
 #
-VERSION= 2.12.6.6
+VERSION= 2.12.6.7
 
 # Names of shared libraries with versions
 #
diff --git a/calc.h b/calc.h
index 0166658..3165f13 100644
--- a/calc.h
+++ b/calc.h
@@ -65,7 +65,6 @@
 
 #define SYMBOLSIZE	256	/* maximum symbol name size */
 #define MAXLABELS	100	/* maximum number of user labels in function */
-#define MAXSTRING	1024	/* maximum size of string constant */
 #define MAXSTACK	2048	/* maximum depth of evaluation stack */
 #define MAXFILES	20	/* maximum number of opened files */
 #define PROMPT1		"> "	/* default normal prompt*/
diff --git a/custom/Makefile b/custom/Makefile
index 6102660..dda093d 100644
--- a/custom/Makefile
+++ b/custom/Makefile
@@ -348,7 +348,7 @@ EXT=
 
 # The default calc versions
 #
-VERSION= 2.12.6.6
+VERSION= 2.12.6.7
 
 # Names of shared libraries with versions
 #
diff --git a/custom/Makefile.head b/custom/Makefile.head
index b87ff5f..0e0aa04 100644
--- a/custom/Makefile.head
+++ b/custom/Makefile.head
@@ -348,7 +348,7 @@ EXT=
 
 # The default calc versions
 #
-VERSION= 2.12.6.6
+VERSION= 2.12.6.7
 
 # Names of shared libraries with versions
 #
diff --git a/custom/c_sysinfo.c b/custom/c_sysinfo.c
index 5272e70..67d35ee 100644
--- a/custom/c_sysinfo.c
+++ b/custom/c_sysinfo.c
@@ -173,8 +173,6 @@ STATIC struct infoname sys_info[] = {
      (FULL)MAXSCANCOUNT},
     {"MAXSTACK", "max depth of evaluation stack", NULL,
      (FULL)MAXSTACK},
-    {"MAXSTRING", "max size of string constant", NULL,
-     (FULL)MAXSTRING},
     {"MAXUFULL", "largest FULL value", NULL,
      (FULL)MAXUFULL},
     {"MAXULONG", "largest unsigned long val", NULL,
diff --git a/hist.h b/hist.h
index 0e9319c..68eabdf 100644
--- a/hist.h
+++ b/hist.h
@@ -36,7 +36,7 @@
 #endif
 
 #ifndef HIST_SIZE
-#define HIST_SIZE		(1024*10)
+#define HIST_SIZE		(1024*32)
 #endif
 
 
diff --git a/input.c b/input.c
index 166bab7..235fae5 100644
--- a/input.c
+++ b/input.c
@@ -59,8 +59,8 @@ E_FUNC FILE *f_open(char *name, char *mode);
 E_FUNC FILE *curstream(void);
 
 
-#define TTYSIZE		100	/* reallocation size for terminal buffers */
-#define MAXDEPTH		10	/* maximum depth of input */
+#define TTYSIZE		8191	/* reallocation size for terminal buffers */
+#define MAXDEPTH	255	/* maximum depth of input */
 #define IS_READ		1	/* reading normally */
 #define IS_REREAD	2	/* reread current character */
 #define chartoint(ch)	((ch) & 0xff)	/* make sure char is not negative */
@@ -789,7 +789,7 @@ ttychar(void)
 {
 	int ch;			/* current char */
 	int len;		/* length of current command */
-	STATIC char charbuf[1024];
+	STATIC char charbuf[256*1024];
 
 	/*
 	 * If we have more to read from the saved command line, then do that.
diff --git a/version.c b/version.c
index 6d81f0b..6811f43 100644
--- a/version.c
+++ b/version.c
@@ -45,7 +45,7 @@ static char *program;
 #define MAJOR_VER	2	/* major library version */
 #define MINOR_VER	12	/* minor library version */
 #define MAJOR_PATCH	6	/* major software level under library version */
-#define MINOR_PATCH	6	/* minor software level or 0 if not patched */
+#define MINOR_PATCH	7	/* minor software level or 0 if not patched */
 
 
 /*