diff --git a/README.md b/README.md
index 801cc86..3851168 100644
--- a/README.md
+++ b/README.md
@@ -44,8 +44,10 @@ video of a an [animation using the tek4010](https://youtu.be/7FMewaoEOmk) and a
         - Can be compiled for other Linux distributions such as Ubuntu
         - Tested with SimH, PiDP-11, PDP-11/93, VAXstation 4000/90a, 2.11 BSD, RSX-11M+, PLOT10
         - Stand alone version tested on Raspberry Pi Zero W
-        - Raspberry Pi 3 Model B+ recommended if run on same system as SimH/PiDP-11
-        - Raspberry Pi 3 Model B+ recommended if run in -full mode on high resolution screens
+        - Raspberry Pi 3 Model B+ or faster recommended if run on same system as SimH/PiDP-11
+        - Raspberry Pi 3 Model B+ or faster recommended if run in -full mode on high resolution screens
+	- Tested with Raspbian Stretch and Raspbian Buster
+	- Tested on Raspberry Pi 4
         - Tested with directly attached HDMI screen and with VNC
 
 **Installation and first tests**
@@ -273,9 +275,14 @@ tek4010 has the following options:
 	-APL		emulate Tektronix 4013/4015 with alternative APL character set.
 			Details see below.
                         
-        -autoClear      erase screen if a line feed is executed at the bottom of the screen.
+	-autoClear      erase screen if a line feed is executed at the bottom of the screen.
                         This makes it sometimes easier to use tek4010 as the only terminal. It
-                        is not the behaviour of the original hardware. 
+                        is not the behaviour of the original hardware.
+
+	-keepsize	tek4010 sets the fontsize to normal whenever the screen is erased.
+			This option keeps the currently selected font size until it is
+			changed with a new escape sequence. Some historic plot files will
+			not reset the font size back to normal if this option is set. 
 
 **APL mode**
 
diff --git a/tek4010 b/tek4010
index ae8007b..2bb4511 100755
Binary files a/tek4010 and b/tek4010 differ
diff --git a/tek4010.c b/tek4010.c
index 6497243..edc85fa 100755
--- a/tek4010.c
+++ b/tek4010.c
@@ -202,7 +202,8 @@ void tek4010_escapeCodeHandler(cairo_t *cr, cairo_t *cr2, int ch)
                         tek4010_checkLimits(cr, cr2);
                         mode = 0; break;
                 case 12:// FF during ESC
-                        tube_changeCharacterSize(cr, cr2, 74, 35, efactor);
+                        if (!argKeepSize)
+                                tube_changeCharacterSize(cr, cr2, 74, 35, efactor);
                         tube_clearPersistent(cr,cr2);
                         mode = 0; break;
                 case 13:mode = 0; break;
@@ -300,6 +301,7 @@ int tek4010_checkReturnToAlpha(int ch)
                 }
                 plotPointMode = 0;
                 specialPlotMode = 0;
+                isGinMode = 0;
                 return 1;
         }
         else return 0;
@@ -333,7 +335,8 @@ void tek4010_draw(cairo_t *cr, cairo_t *cr2, int first)
         // clear persistent surface, if necessary
         if (tube_doClearPersistent) {
                 tube_clearPersistent(cr,cr2);
-                tube_changeCharacterSize(cr, cr2, 74, 35, efactor);
+                if (!argKeepSize)
+                        tube_changeCharacterSize(cr, cr2, 74, 35, efactor);
         }
         
         if (aplMode)
diff --git a/tube.c b/tube.c
index 51a574d..14add90 100755
--- a/tube.c
+++ b/tube.c
@@ -75,6 +75,7 @@ int argFull = 0;
 int argARDS = 0;
 int argAPL = 0;
 int argAutoClear = 0;
+int argKeepSize = 0;
 
 int refresh_interval;           // after this time in msec next refresh is done
 
@@ -156,6 +157,10 @@ int tube_isInput()
 // is char available on getDataPipe?
 {
         int bytesWaiting;
+        // if (isGinMode)
+        // do not allow any further input from host during GIN mode
+        // this allows to test .plt files with GIN mode
+        //        return 0;
         ioctl(getDataPipe[0], FIONREAD, &bytesWaiting);
         if (DEBUG) {
                 debugCount++;
@@ -274,7 +279,7 @@ void tube_init(int argc, char* argv[])
         char *argv2[20];
         size_t bufsize = 127;
         int firstArg = 1;
-        printf("tek4010 version 1.4.1\n");
+        printf("tek4010 version 1.4.2\n");
         windowName = "Tektronix 4010/4014 emulator";
         if ((argc<2) || (argc>19)) {
                 printf("Error:number of arguments\n");
@@ -310,6 +315,8 @@ void tube_init(int argc, char* argv[])
                         argFull = 1;
                 else if (strcmp(argv[firstArg],"-autoClear") == 0)
                         argAutoClear = 1;
+                else if (strcmp(argv[firstArg],"-keepsize") == 0)
+                        argKeepSize = 1;
                 else if (strcmp(argv[firstArg],"-APL") == 0) {
                         argAPL = 1;
                         windowName = "Tektronix 4013/4015 emulator (APL)";
diff --git a/tube.h b/tube.h
index 94feda3..2e0bd71 100644
--- a/tube.h
+++ b/tube.h
@@ -18,6 +18,7 @@ extern int argTab1;
 extern int argRaw;
 extern int argAPL;
 extern int argAutoClear;
+extern int argKeepSize;
 
 extern int hDotsPerChar;
 extern int vDotsPerChar;
diff --git a/versions.txt b/versions.txt
index 6deeff0..d933764 100644
--- a/versions.txt
+++ b/versions.txt
@@ -1,3 +1,7 @@
+Version 1.4.2 July 24, 2019
+===========================
+- argument -keepsize added
+- going back to alpha mode forces now the end of GIN mode
 
 Version 1.4.1 June 20, 2019
 ===========================