diff --git a/basic.js b/basic.js
index e73bea7..d7b2408 100644
--- a/basic.js
+++ b/basic.js
@@ -412,7 +412,15 @@ this.basic = (function() {
       0xC060: function() { return env.tty.getButtonState ? env.tty.getButtonState(3) : 0; },
       0xC061: function() { return env.tty.getButtonState ? env.tty.getButtonState(0) : 0; },
       0xC062: function() { return env.tty.getButtonState ? env.tty.getButtonState(1) : 0; },
-      0xC063: function() { return env.tty.getButtonState ? env.tty.getButtonState(2) : 0; }
+      0xC063: function() { return env.tty.getButtonState ? env.tty.getButtonState(2) : 0; },
+
+      // Graphics State
+      0xC01A: function() { return (env.display && !env.display.getState().graphics) * 128; },
+      0xC01B: function() { return (env.display && !env.display.getState().full) * 128; },
+      0xC01C: function() { return (env.display && !env.display.getState().page1) * 128; },
+      0xC01D: function() { return (env.display && !env.display.getState().lores) * 128; },
+      0xC01E: function() { return (env.tty.isAltCharset && env.tty.isAltCharset()) * 128; },
+      0xC01F: function() { return (env.tty.isFirmwareActive && env.tty.isFirmwareActive()) * 128; }
     };
 
     poke_table = {
diff --git a/index.js b/index.js
index dff3f40..c4de80f 100644
--- a/index.js
+++ b/index.js
@@ -58,6 +58,9 @@ window.addEventListener('DOMContentLoaded', function() {
         hires2.show(false);
         tty.splitScreen(0);
       }
+    },
+    getState: function() {
+      return Object.assign({}, this.state);
     }
   };
   var pdl = [0, 0, 0, 0];
diff --git a/reference.html b/reference.html
index b993f49..e2965bc 100644
--- a/reference.html
+++ b/reference.html
@@ -304,6 +304,14 @@ can be literals (unquoted strings), strings, or numbers
         <li><code>PEEK(230)</code> &mdash; Hi-Res plotting page (32 = page 1, 64 = page 2)
         <li><code>PEEK(49152)</code> &mdash; Read Keyboard
         <li><code>PEEK(49168)</code> &mdash; Clear Keyboard strobe
+
+        <li><code>PEEK(49178)</code> &mdash; See if text mode (&gt; 127) or graphics mode (&lt; 128)
+        <li><code>PEEK(49179)</code> &mdash; See if mixed mode (&gt; 127) or full mode (&lt; 128)
+        <li><code>PEEK(49180)</code> &mdash; See if page2 (&gt; 127) or page1 (&lt; 128)
+        <li><code>PEEK(49181)</code> &mdash; See if hires mode (&gt; 127) or lores mode (&lt; 128)
+        <li><code>PEEK(49182)</code> &mdash; See if mousetext mode (&gt; 127)
+        <li><code>PEEK(49188)</code> &mdash; See if 80-column mode (&gt; 127)
+
         <li><code>PEEK(49200)</code> &mdash; Click Speaker (no-op)
         <li><code>PEEK(49248)</code> &mdash; Read Paddle Button #3 &mdash; <em>Use the PageDown key</em>
         <li><code>PEEK(49249)</code> &mdash; Read Paddle Button #0 &mdash; <em>Use the Home key</em>
diff --git a/samples/sample.unittests.txt b/samples/sample.unittests.txt
index 50bb95f..f15838d 100644
--- a/samples/sample.unittests.txt
+++ b/samples/sample.unittests.txt
@@ -403,9 +403,8 @@
 7001 IF NOT LR THEN PRINT "<skipping GR tests>" : GOTO 8000
 
 7010 T$ = "GR"
-: U = PEEK(36) : V = PEEK(37)
-: GR : S = (PEEK(37) = 23) : TEXT : POKE 36,U : POKE 37,V : GOSUB 1
-: GR : S = (PEEK(34) = 20) : TEXT : POKE 36,U : POKE 37,V : GOSUB 1
+: U = PEEK(36) : V = PEEK(37) : GR : S = (PEEK(37) = 23) : TEXT : POKE 36,U : POKE 37,V : GOSUB 1
+: U = PEEK(36) : V = PEEK(37) : GR : S = (PEEK(34) = 20) : TEXT : POKE 36,U : POKE 37,V : GOSUB 1
 
 7011 POKE 49232,0 : POKE 49234,0 : POKE 49238,0
 
@@ -659,7 +658,7 @@
 : DEF FN A$(X$) = X$ + X$ : S = (FN A$("ABC") = "ABCABC") : GOSUB 1
 
 15000 PRINT : PRINT "PEEK Compatibility Shims ";
-: PRINT "UNIT TESTS NOT YET IMPLEMENTED ";
+: PRINT "UNIT TESTS NOT FULLY IMPLEMENTED ";
 15001 X = PEEK(49152) : X = PEEK(-16384) : REM Read keyboard
 15002 X = PEEK(49168) : X = PEEK(-16368) : REM Clear keyboard strobe
 15003 X = PEEK(49200) : X = PEEK(-16336) : REM Toggle speaker (no-op)
@@ -673,6 +672,29 @@
 15010 REM Do as part of I/O follow-on module
 15010 REM **********************************************
 
+15020 T$ = "PEEK(49178) RdTEXT"
+: S = (PEEK(49178) > 127) : GOSUB 1
+: U = PEEK(36) : V = PEEK(37) : GR : S = (PEEK(49178) < 128) : TEXT : POKE 36,U : POKE 37,V : GOSUB 1
+
+15030 T$ = "PEEK(49179) RdMIXED"
+: HGR  : S = (PEEK(49179) > 127) : TEXT : GOSUB 1
+: HGR2 : S = (PEEK(49179) < 128) : TEXT : GOSUB 1
+
+15040 T$ = "PEEK(49180) RdPage2"
+: HGR2 : S = (PEEK(49180) > 127) : TEXT : GOSUB 1
+: HGR  : S = (PEEK(49180) < 128) : TEXT : GOSUB 1
+
+15050 T$ = "PEEK(49181) RdHiRes"
+: HGR : S = (PEEK(49181) > 127) : TEXT : GOSUB 1
+: U = PEEK(36) : V = PEEK(37) : GR : S = (PEEK(49181) < 128) : TEXT : POKE 36,U : POKE 37,V : GOSUB 1
+
+15060 T$ = "PEEK(49182) RdAltChar"
+: S = (PEEK(49182) < 128) : GOSUB 1
+: PRINT CHR$(15);CHR$(27); : S = (PEEK(49182) > 127) : PRINT CHR$(24);CHR$(14); : GOSUB 1
+
+15070 T$ = "PEEK(49183) Rd80Col"
+: S = (PEEK(49183) > 127) : GOSUB 1
+
 
 16000 PRINT : PRINT "Operators ";
 
diff --git a/script.js b/script.js
index fa4f637..f91e9b4 100644
--- a/script.js
+++ b/script.js
@@ -69,6 +69,9 @@
           hires2.show(false);
           tty.splitScreen(0);
         }
+      },
+      getState: function() {
+        return Object.assign({}, this.state);
       }
     };
     var pdl = [0, 0, 0, 0];
diff --git a/tty.js b/tty.js
index 8858657..4e2c642 100644
--- a/tty.js
+++ b/tty.js
@@ -239,6 +239,13 @@ function TTY(screenElement, keyboardElement) {
     init(active, 24, active ? 80 : 40);
   };
 
+  this.isFirmwareActive = function isFirmwareActive() {
+    return firmwareActive;
+  };
+
+  this.isAltCharset = function isAltCharset() {
+    return mousetext;
+  };
 
   function scrollUp() {
     var x, y, cell;