diff --git a/lib/stdlib.inc b/lib/stdlib.inc
index 62eb8fc..e0b08a7 100644
--- a/lib/stdlib.inc
+++ b/lib/stdlib.inc
@@ -240,6 +240,7 @@ procedure freadreal(var v:real;var f:file); external;
 procedure openchannel(name:filenamestr; var f:file; mode:filemode; var error:integer); external;
 procedure open(var f:file; name:pathnamestr; mode: filemode); external;
 procedure noecho(var f:file; noecho:boolean; var old:boolean); external;
+procedure nointr(var f:file; aBool:boolean; var old:boolean); external;
 
 procedure intstr(v:integer; fieldWith:integer; var rbuf:string);
 	external;
@@ -269,8 +270,8 @@ procedure TextDefault; external;
 
 procedure PTerm; external; (* from runtime.s *)
 procedure PExec(prgfile:pathnamestr; var args:PArgVec; argCount:integer;var error:integer); external;
-procedure PExec2(prgfile:pathnamestr; arg1:string; var error:integer); external;
-procedure PExec3(prgfile:pathnamestr; arg1, arg2:string; var error:integer); external;
+procedure PExec1(prgfile:pathnamestr; arg1:string; var error:integer); external;
+procedure PExec2(prgfile:pathnamestr; arg1, arg2:string; var error:integer); external;
 function ParamStr(i:integer):string; external;
 function ParamCount():integer; external;
 
diff --git a/lib/stdlib.pas b/lib/stdlib.pas
index 945ece9..a57ba1c 100644
--- a/lib/stdlib.pas
+++ b/lib/stdlib.pas
@@ -2563,6 +2563,16 @@ begin
 	end;
 end;
 
+procedure nointr(var f:file;aBool:boolean;var old:boolean);
+begin
+	if f.typ <> IOChannel then
+		fileerror(f, IOInvalidOp)
+	else
+	begin
+		old := f.nointr;
+		f.nointr := nointr;
+	end;
+end;
 (*
   implementation of Xorshift algorithm by George Marsaglia,
   see: Marsaglia, George (July 2003).
@@ -2599,6 +2609,7 @@ begin
 		if ord(aChar) <= ord('z') then
 			upcase := chr(ord(aChar) - 32)
 		else
+			upcase := aChar
 	else
 		upcase := aChar;
 end;
@@ -2664,14 +2675,14 @@ begin
 	end;
 end;
 
-procedure PExec2(prgfile:pathnamestr; arg1:string; var error:integer);
+procedure PExec1(prgfile:pathnamestr; arg1:string; var error:integer);
 var args:PArgVec;
 begin
 	args[0] := arg1;
 	PExec(prgfile, args, 1, error);
 end;
 
-procedure PExec3(prgfile:pathnamestr; arg1, arg2:string; var error:integer);
+procedure PExec2(prgfile:pathnamestr; arg1, arg2:string; var error:integer);
 var args:PArgVec;
 begin
 	args[0] := arg1;
diff --git a/pcomp/pcomp.pas b/pcomp/pcomp.pas
index 8936f7a..a3e4986 100644
--- a/pcomp/pcomp.pas
+++ b/pcomp/pcomp.pas
@@ -1,5 +1,5 @@
 (* Copyright 2021-2024 Sebastian Lederer. See the file LICENSE.md for details *)
-{$H384}
+{$H600}
 {$S64}
 program PascalCompiler;
 {$R+}
diff --git a/progs/shell.pas b/progs/shell.pas
index 610dcfe..6423b3f 100644
--- a/progs/shell.pas
+++ b/progs/shell.pas
@@ -324,7 +324,7 @@ begin
 		PExec(EDITORPROG, args, 3, error);
 	end
 	else
-		PExec2(EDITORPROG, ShellWorkFile, error);
+		PExec1(EDITORPROG, ShellWorkFile, error);
 	writeln('PExec error ', error);
 end;
 
@@ -334,7 +334,7 @@ var filename:filenamestr;
 begin
 	requireWorkfile;
 	filename := replaceExtension(ShellWorkFile, '.s');
-	PExec2(ASMPROG, filename, error);
+	PExec1(ASMPROG, filename, error);
 	writeln('PExec error ', error);
 end;
 
@@ -344,7 +344,7 @@ var filename:filenamestr;
 begin
 	requireWorkfile;
 	filename := replaceExtension(ShellWorkFile, '.pas');
-	PExec3(COMPILERPROG, '-S', filename, error);
+	PExec2(COMPILERPROG, '-S', filename, error);
 	writeln('PExec error ', error);
 end;
 
@@ -354,7 +354,7 @@ var filename:filenamestr;
 begin
 	requireWorkfile;
 	filename := replaceExtension(ShellWorkFile, '.pas');
-	PExec2(COMPILERPROG, filename, error);
+	PExec1(COMPILERPROG, filename, error);
 	writeln('PExec error ', error);
 end;
 
@@ -373,7 +373,7 @@ end;
 procedure krunch;
 var error:integer;
 begin
-	PExec2(RECLAIMPROG, DefaultVolume, error);
+	PExec1(RECLAIMPROG, DefaultVolume, error);
 	writeln('PExec error ', error);
 end;
 
diff --git a/tridoraemu/framebuffer.go b/tridoraemu/framebuffer.go
index 4586287..189100a 100644
--- a/tridoraemu/framebuffer.go
+++ b/tridoraemu/framebuffer.go
@@ -32,6 +32,7 @@ type Framebuffer struct {
 	paletteSlot word
 	vmem [VmemWords]word
 	readCount int
+        paletteChanged bool
 }
 
 func (f *Framebuffer) initialize() {
@@ -104,6 +105,26 @@ func (f *Framebuffer) readPalette() word {
 	return word(0)
 }
 
+func (f *Framebuffer) startFrame() {
+	// when the palette changes, we
+	// need to redraw every pixel
+	// to get the new colors
+	if f.paletteChanged {
+		oldRAddr := f.readAddr
+		oldWAddr := f.writeAddr
+		f.readAddr = 0
+		f.writeAddr = 0
+
+		for i := 0; i < VmemWords; i++ {
+			f.writeVmem(f.readVmem())
+		}
+
+		f.readAddr = oldRAddr
+		f.writeAddr = oldWAddr
+		f.paletteChanged = false
+	}
+}
+
 func (f *Framebuffer) writePalette(value word) {
 	// 4 bits per color channel
 	r := uint8((value & 0b111100000000) >> 8)
@@ -116,6 +137,7 @@ func (f *Framebuffer) writePalette(value word) {
 	b = b << 4
 
 	f.palette[f.paletteSlot] = color.RGBA{r,g,b,0}
+	f.paletteChanged = true
 }
 
 func (f *Framebuffer) readCtl() word {
diff --git a/tridoraemu/tridoraemu.go b/tridoraemu/tridoraemu.go
index 875c3c0..88804b4 100644
--- a/tridoraemu/tridoraemu.go
+++ b/tridoraemu/tridoraemu.go
@@ -43,6 +43,7 @@ type Game struct{
 func (g *Game) Update() error {
 	startTime := time.Now()
 
+	framebuffer.startFrame()
 	for i := 0; i < g.stepsPerFrame; i++ {
 		err := cpu.step()
 		if err != nil {