diff --git a/z80.cpp b/z80.cpp
index 0a7170a..6034bb1 100644
--- a/z80.cpp
+++ b/z80.cpp
@@ -190,10 +190,11 @@ namespace z80
     {
         t+=1;
         reading_m1 = true;
-        /*if (rPC==0x056c) {
-            zx_tape::rewind();
-            zx_tape::play();
-        }*/
+        if (rPC==0x056A) {
+            z80debug::stop();
+            //zx_tape::rewind();
+            //zx_tape::play();
+        }
         return READ_MEM_8();
     }
 
diff --git a/z80debug.cpp b/z80debug.cpp
index 1ff1f89..4b0b419 100644
--- a/z80debug.cpp
+++ b/z80debug.cpp
@@ -104,6 +104,7 @@ namespace z80debug
                 if ((e->window.event==SDL_WINDOWEVENT_SHOWN) || (e->window.event==SDL_WINDOWEVENT_EXPOSED)) {
                     int w; int h;
                     SDL_GetWindowSize(win, &w, &h);
+                    w/=2; h/=2;
                     midx = (w/CHR_W) - 25;
                     win_h = (h/CHR_H);
                     mem_y = win_h - mem_h - con_h;
@@ -332,8 +333,9 @@ namespace z80debug
     void show()
     {
         if (!win) {
-            win = SDL_CreateWindow("Z80 Debugger", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 98*CHR_W, 44*CHR_H, SDL_WINDOW_RESIZABLE);
+            win = SDL_CreateWindow("Z80 Debugger", 10, 50, 98*CHR_W*2, 44*CHR_H*2, SDL_WINDOW_SHOWN);
             ren = SDL_CreateRenderer(win, -1, 0);
+            SDL_RenderSetLogicalSize(ren, 98*CHR_W, 44*CHR_H);
             ui::window::registerWindow(SDL_GetWindowID(win), eventHandler);
             tex = ui::createtexture(ren);
         }
@@ -382,7 +384,7 @@ namespace z80debug
     void cont() {
         zxscreen::setTitle("");
         is_debugging = is_paused = false;
-        //hide();
+        hide();
         refresh();
         zxscreen::focus();
         speaker::enable();
diff --git a/zx_screen.cpp b/zx_screen.cpp
index c524345..7f23c8d 100644
--- a/zx_screen.cpp
+++ b/zx_screen.cpp
@@ -26,7 +26,7 @@ namespace zxscreen
     uint32_t t_states_per_scanline = 224;
     uint32_t vsync_lines = 16;
 
-    uint8_t zoom = 1;
+    uint8_t zoom = 2;
     bool fullscreen = false;
     bool full_refresh = true;
     int fullscreen_scale = 1;
@@ -113,6 +113,11 @@ namespace zxscreen
     bool eventHandler(SDL_Event *e)
     {
         if (e->type==SDL_WINDOWEVENT) {
+            //int x, y;
+            //SDL_GetWindowPosition(win, &x, &y);
+            //char tmp[256];
+            //sprintf(tmp, " %ix%i", x, y);
+            //setTitle(tmp);
             if (e->window.event==SDL_WINDOWEVENT_CLOSE) {
                 return false;
             } else if ((e->window.event==SDL_WINDOWEVENT_SHOWN) || (e->window.event==SDL_WINDOWEVENT_EXPOSED)) {
@@ -163,7 +168,7 @@ namespace zxscreen
         if (win) SDL_DestroyWindow(win);
 
         const int z = fullscreen ? 1 : zoom;
-        win = SDL_CreateWindow("ZX Spectrum Screen", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 352*z, 296*z, fullscreen?SDL_WINDOW_FULLSCREEN_DESKTOP:SDL_WINDOW_SHOWN);
+        win = SDL_CreateWindow("ZX Spectrum Screen", 1216, 565, 352*z, 296*z, fullscreen?SDL_WINDOW_FULLSCREEN_DESKTOP:SDL_WINDOW_ALLOW_HIGHDPI);
         ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED);
         tex = SDL_CreateTexture(ren, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, 352, 296);
         uitex = ui::createtexture(ren);
diff --git a/zx_tape.cpp b/zx_tape.cpp
index 6b4e8ae..3d09197 100644
--- a/zx_tape.cpp
+++ b/zx_tape.cpp
@@ -202,7 +202,7 @@ namespace zx_tape
                 pulse_pos -= PULSE_LEN_SYNC3;
                 pulse_level = 0;
                 current_section = PULSE_WAIT;
-                printf("going to pulse_wait..%i.\n", current_block);
+                printf("going to pulse_wait..%i (%i).\n", current_block, blocks[current_block].length);
             }
 
         }