diff --git a/vimlac/Makefile b/vimlac/Makefile
index 34391b9..a154f16 100755
--- a/vimlac/Makefile
+++ b/vimlac/Makefile
@@ -3,7 +3,8 @@ CFILES = cpu.c dcpu.c ptrptp.c memory.c kb.c ttyin.c ttyout.c trace.c error.c lo
 HFILES = cpu.h dcpu.h ptrptp.h memory.h kb.h ttyin.h ttyout.h trace.h error.h log.h plist.h bootstrap.h display_sdl.h
 OFILES = vimlac.o $(DEVFILES)
 
-CFLAGS=-O2 -Wall -pedantic -std=c99 -g -I /usr/local/include/SDL2/ -l SDL2-2.0.0
+CFLAGS=-O2 -Wall -pedantic -std=c99 -g -I /usr/local/include/SDL2/
+LDFLAGS=-l SDL2-2.0.0
 
 test:	vimlac
 	rm -f vimlac.log trace.out *.pbm; time ./vimlac -b ptr -ptr chars.ptp -r 040 -r 0100
@@ -15,7 +16,7 @@ test_cpu:	test_cpu.c $(DEVFILES) Makefile
 	gcc -o test_cpu ${CFLAGS} $(DEVFILES) test_cpu.c
 
 vimlac:	${OFILES} Makefile
-	gcc -o vimlac ${CFLAGS} ${OFILES}
+	gcc -o vimlac ${CFLAGS} ${OFILES} ${LDFLAGS}
 
 test_ptr:	test_ptr.c ptrptp.c error.c Makefile
 	gcc -o test_ptr ${CFLAGS} error.c ptrptp.c test_ptr.c
diff --git a/vimlac/cpu.c b/vimlac/cpu.c
index 542329d..d234196 100755
--- a/vimlac/cpu.c
+++ b/vimlac/cpu.c
@@ -141,6 +141,12 @@ cpu_running(void)
 }
 
 
+void
+cpu_abort(void)
+{
+    cpu_on = false;
+}
+
 void
 cpu_set_AC(WORD new_ac)
 {
diff --git a/vimlac/cpu.h b/vimlac/cpu.h
index 3c0a50c..6f7e45a 100755
--- a/vimlac/cpu.h
+++ b/vimlac/cpu.h
@@ -25,6 +25,7 @@ void cpu_set_AC(WORD ac);
 void cpu_set_L(WORD l);
 void cpu_set_PC(WORD pc);
 void cpu_set_DS(WORD ds);
+void cpu_abort(void);
 
 
 #endif
diff --git a/vimlac/dcpu.c b/vimlac/dcpu.c
index f29352c..c408985 100755
--- a/vimlac/dcpu.c
+++ b/vimlac/dcpu.c
@@ -9,7 +9,7 @@
 #include "vimlac.h"
 #include "dcpu.h"
 #include "memory.h"
-#include "display_pbm.h"
+#include "display.h"
 #include "log.h"
 #include "trace.h"
 
diff --git a/vimlac/display_sdl.c b/vimlac/display_sdl.c
index 9aa9cb4..e342a59 100644
--- a/vimlac/display_sdl.c
+++ b/vimlac/display_sdl.c
@@ -17,8 +17,13 @@
  * Constants, etc.
  ******/
 
-#define MAX_X           512     // max X coord
-#define MAX_Y           512     // max Y coord
+// screen/display stuff
+#define MAX_X           512     // max X coord for display
+#define MAX_Y           512     // max Y coord for display
+#define SCALE_MAX_X     2048    // max vimlac X coord
+#define SCALE_MAX_Y     2048    // max vimlac Y coord
+
+// initial and increment size for dynamic DisplayList
 #define DL_INIT_SIZE    2048    // initial size of the DisplayList array
 #define DL_INC_SIZE     1024    // how much we increase DisplayList size
 
@@ -32,10 +37,10 @@ typedef struct DrawLine
 } DrawLine;
 
 // display state variables
-static SDL_Window* window = NULL;       // the SDL window reference
-static SDL_Renderer* renderer = NULL;   // reference to SDL renderer
+static SDL_Window *window = NULL;       // the SDL window reference
+static SDL_Renderer *renderer = NULL;   // reference to SDL renderer
 
-static DrawLine *DisplayList;           // the DrawLine array
+static DrawLine *DisplayList;           // the DrawLine array (dynamic)
 static int DisplayListSize = 0;         // current size of the dynamic DisplayList
 static int NumLines = 0;                // number of lines in DisplayList
 static bool DisplayDirty = false;       // true if the DisplayList has changed
@@ -69,6 +74,16 @@ void display_draw(int x1, int y1, int x2, int y2)
         DisplayListSize = newsize;
     }
 
+    // invert the Y coords
+    y1 = SCALE_MAX_Y - y1;
+    y2 = SCALE_MAX_Y - y2;
+
+    // scale line coords
+    x1 = x1 / (SCALE_MAX_X / MAX_X);
+    y1 = y1 / (SCALE_MAX_Y / MAX_Y);
+    x2 = x2 / (SCALE_MAX_X / MAX_X);
+    y2 = y2 / (SCALE_MAX_Y / MAX_Y);
+    
     // add new line to DisplayList
     DrawLine *p = &DisplayList[NumLines++];
 
@@ -131,18 +146,58 @@ Description : Initialize the SDL system.
 
 bool display_init()
 {
+    printf("display_init: called\n");
+
+    SDL_DisplayMode dm;
+
     if (SDL_Init(SDL_INIT_VIDEO) != 0)
         return false;
 
-    if (SDL_CreateWindowAndRenderer(MAX_X, MAX_Y, 0, &window, &renderer) != 0)
+    if (SDL_GetDesktopDisplayMode(0, &dm) != 0)
+    {
+        printf("SDL_GetDesktopDisplayMode failed: %s\n", SDL_GetError());
+        return false;
+    }
+    printf("Screen wxh = %d x %d\n", dm.w, dm.h);
+
+//    if (SDL_CreateWindowAndRenderer(MAX_X, MAX_Y, 0, &window, &renderer) != 0)
+//    {
+//        if (renderer)
+//            SDL_DestroyRenderer(renderer);
+//        if (window)
+//            SDL_DestroyWindow(window);
+//        return false;
+//    }
+
+    window = SDL_CreateWindow("SDL Tutorial", SDL_WINDOWPOS_UNDEFINED,
+                              SDL_WINDOWPOS_UNDEFINED, MAX_X,
+                              MAX_Y, SDL_WINDOW_SHOWN);
+
+//    window = SDL_CreateWindow(
+//        "An SDL2 window",                  // window title
+//        SDL_WINDOWPOS_UNDEFINED,           // initial x position
+//        SDL_WINDOWPOS_UNDEFINED,           // initial y position
+//        MAX_X,                             // width, in pixels
+//        MAX_Y,                             // height, in pixels
+//        SDL_WINDOW_OPENGL                  // flags - see below
+//    );
+    if (!window)
+    {
+        return false;
+    }
+
+
+    renderer = SDL_CreateRenderer(window, -1, 0);
+    if (!renderer)
     {
-        if (renderer)
-            SDL_DestroyRenderer(renderer);
         if (window)
             SDL_DestroyWindow(window);
         return false;
     }
 
+    // set window title
+    SDL_SetWindowTitle(window, "vimlac 0.1");
+
     // allocate the initial DisplayList array
     DisplayList = malloc(sizeof(DrawLine) * DL_INIT_SIZE);
     if (DisplayList)
diff --git a/vimlac/vimlac.c b/vimlac/vimlac.c
index afbfb1d..7233157 100755
--- a/vimlac/vimlac.c
+++ b/vimlac/vimlac.c
@@ -32,12 +32,12 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <ctype.h>
+#include <SDL.h>
 
 #include "vimlac.h"
 #include "bootstrap.h"
 #include "memory.h"
 #include "ptrptp.h"
-//#include "display_pbm.h"
 #include "display.h"
 #include "cpu.h"
 #include "dcpu.h"
@@ -140,6 +140,16 @@ run(WORD pc)
 
         if (!dcpu_running() && display_dirty())
             display_write();
+
+        SDL_Event e;
+        while (SDL_PollEvent(&e) != 0)
+        {
+            if (e.type == SDL_QUIT)
+            {
+                cpu_abort();
+                printf("cpu_on set to %s\n", cpu_running() ? "true" : "false");
+            }
+        }
     }
 
     trace_close();