diff --git a/Makefile b/Makefile
index e83d0e3..e30c8c6 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 all: CFRIDGE
 
 CFRIDGE: *.c *.h *.s
-	cl65 -C apple2.cfg -t apple2enh -o CFRIDGE *.c *.s 
+	cl65 -C apple2-tgi.cfg -t apple2enh -o CFRIDGE *.c *.s 
 
 clean:
 	-rm *.o CFRIDGE
diff --git a/a2e.hi.tgi b/a2e.hi.tgi
new file mode 100644
index 0000000..eee1e64
Binary files /dev/null and b/a2e.hi.tgi differ
diff --git a/apple2-tgi.cfg b/apple2-tgi.cfg
new file mode 100644
index 0000000..68dfe4c
--- /dev/null
+++ b/apple2-tgi.cfg
@@ -0,0 +1,39 @@
+FEATURES {
+    STARTADDRESS: default = $4000;
+}
+MEMORY {
+    ZP:     start = $0080, size = $001A, define = yes;
+    HEADER: start = $0000, size = $0004, file = "";
+    RAM:    start = $4000, size = $7600, file = %O;
+}
+SEGMENTS {
+    EXEHDR:   load = HEADER, type = ro;
+    STARTUP:  load = RAM,    type = ro, define = yes;
+    LOWCODE:  load = RAM,    type = ro,               optional = yes;
+    INIT:     load = RAM,    type = ro, define = yes, optional = yes;
+    CODE:     load = RAM,    type = ro;
+    RODATA:   load = RAM,    type = ro;
+    DATA:     load = RAM,    type = rw;
+    BSS:      load = RAM,    type = bss, define = yes;
+    HEAP:     load = RAM,    type = bss, optional = yes; # must sit just below stack
+    ZEROPAGE: load = ZP,     type = zp;
+}
+FEATURES {
+    CONDES: segment = INIT,
+	    type = constructor,
+	    label = __CONSTRUCTOR_TABLE__,
+	    count = __CONSTRUCTOR_COUNT__;
+    CONDES: segment = RODATA,
+	    type = destructor,
+	    label = __DESTRUCTOR_TABLE__,
+	    count = __DESTRUCTOR_COUNT__;
+    CONDES: type = interruptor,
+	    segment = RODATA,
+	    label = __INTERRUPTOR_TABLE__,
+	    count = __INTERRUPTOR_COUNT__;
+}
+SYMBOLS {
+    __STACKSIZE__ = $800;	# 2K stack
+}
+
+
diff --git a/main.c b/main.c
index 51fbd28..1acba5b 100644
--- a/main.c
+++ b/main.c
@@ -3,6 +3,9 @@
 #include <errno.h>
 #include <string.h>
 #include <peekpoke.h>
+#include <modload.h>
+#include <tgi.h>
+#include <stdlib.h>
 #include "ow.h"
 #include "ow-temp.h"
 #include "ow-time.h"
@@ -11,6 +14,7 @@
 COMP_STATUS compressor_status;
 unsigned char* tempsensor=NULL;
 unsigned char* clockdev=NULL;
+unsigned char tempsamples[280];
 
 int main (void)
 {
@@ -24,6 +28,17 @@ int main (void)
   time_t shutoff=0;
   unsigned char cmd;
   time_t gototime=0;
+  time_t lastupdate=0;
+
+  for (i=0; i<280; i++)
+    tempsamples[i]=70;
+
+  tgi_load(TGI_MODE_280_192_6);
+  if (tgi_geterror()!=TGI_ERR_OK)
+  {
+    printf("tgi_load() failed\n");
+    exit(EXIT_FAILURE);
+  }
 
   devcount=ow_enumeratedevices(devs, 10);
 
@@ -59,17 +74,24 @@ int main (void)
     clrscr();
   }
 
+  tgi_init(); // turn on Hi-Res mode
+  POKE(-16301,0); // make it split-screen
+  drawgraph(70);
+  if (tgi_geterror()!=TGI_ERR_OK)
+  {
+    printf("tgi_init() failed\n");
+    exit(EXIT_FAILURE);
+  }
   relayctrl(0);
-  gotoxy(25,0);
+  gotoxy(25,20);
   printf("off ");
-  gotoxy(0,2);
   do
   {
     do
     {
       t=ow_time_read(clockdev);
       currtemp=ow_temp_read(tempsensor, OW_TEMP_FAHRENHEIT);      
-      gotoxy(0,0);
+      gotoxy(0,20);
       printf("curr=%i set=%i goto=%i \n", 
         currtemp, 
         setpoint,
@@ -83,30 +105,35 @@ int main (void)
         intime.tm_min,
         intime.tm_sec);
       printf("                     \n");
+      if (t>lastupdate+60)
+      {
+        lastupdate=t;
+        drawgraph(currtemp);
+      }
       gotoy(wherey()-1);
       if (currtemp>=setpoint+2 && compressor_status==COMP_OFF)
       {
         if (t-shutoff>300)
         {
           relayctrl(1);
-          gotoxy(25,0);
+          gotoxy(25,20);
           printf("on  ");
-          gotoxy(0,2);
+          gotoxy(0,22);
         }
         else
         {
-          gotoxy(25,0);
+          gotoxy(25,20);
           printf("wait");
-          gotoxy(0,2);
+          gotoxy(0,22);
         }
       }
       if (currtemp<=setpoint-2 && compressor_status==COMP_ON)
       {
         relayctrl(0);
         shutoff=t;
-        gotoxy(25,0);
+        gotoxy(25,20);
         printf("off ");
-        gotoxy(0,2);
+        gotoxy(0,22);
       }
       if (t>=gototime && gotopoint!=setpoint)
       {
@@ -244,3 +271,41 @@ void relayctrl(unsigned char on)
   compressor_status=(on)?COMP_ON:COMP_OFF;
   return;
 }
+
+void drawgraph(unsigned char newsample)
+{
+  unsigned int x, y;
+  char mkr[3]="00";
+  
+  tgi_setcolor(0);
+  tgi_setpixel(0,yscale(tempsamples[0]));
+  tgi_gotoxy(0,yscale(tempsamples[0]));
+  for (x=1; x<280; x++)
+  {
+    tgi_lineto(x,yscale(tempsamples[x]));
+    tempsamples[x-1]=tempsamples[x];
+  }
+  tempsamples[279]=newsample;
+  for (y=30; y<=90; y+=10)
+  {
+    tgi_setcolor(1);
+    tgi_line(14,yscale(y),279,yscale(y));
+    tgi_setcolor(3);
+    mkr[0]=48+(y/10);
+    tgi_outtextxy(0,yscale(y)-4,mkr);
+  }
+  tgi_setpixel(0,yscale(tempsamples[0]));
+  tgi_gotoxy(0,yscale(tempsamples[0]));
+  for (x=1; x<280; x++)
+    tgi_lineto(x,yscale(tempsamples[x]));
+}
+
+int yscale(int y)
+{
+  if (y>90) // clamp to within range
+    y=90;
+  if (y<30)
+    y=30;
+  return 5+(90-y)*5/2;
+}
+
diff --git a/main.h b/main.h
index ee93f45..e6239ee 100644
--- a/main.h
+++ b/main.h
@@ -8,5 +8,7 @@ int readYN();
 int readnum(int defval, unsigned char timeout);
 void backup();
 void relayctrl(unsigned char on);
+void drawgraph(unsigned char newsample);
+int yscale(int y);
 
 #endif // _MAIN_H