diff --git a/instructions.xlsx b/instructions.xlsx
index f51f05f..44d3e27 100644
Binary files a/instructions.xlsx and b/instructions.xlsx differ
diff --git a/machine_alpha/machine_alpha.bdf b/machine_alpha/machine_alpha.bdf
index eecd854..bbe069f 100644
--- a/machine_alpha/machine_alpha.bdf
+++ b/machine_alpha/machine_alpha.bdf
@@ -124,7 +124,7 @@ applicable agreement for further details.
 )
 (pin
 	(input)
-	(rect 2128 1312 2296 1328)
+	(rect 1920 1312 2088 1328)
 	(text "INPUT" (rect 133 0 161 10)(font "Arial" (font_size 6)))
 	(text "uIR7" (rect 5 0 28 12)(font "Arial" ))
 	(pt 168 8)
@@ -3145,6 +3145,31 @@ applicable agreement for further details.
 		(rectangle (rect 16 16 112 400)(line_width 1))
 	)
 )
+(symbol
+	(rect 2176 1304 2224 1336)
+	(text "NOT" (rect 1 0 21 10)(font "Arial" (font_size 6)))
+	(text "inst3" (rect 3 21 26 33)(font "Arial" ))
+	(port
+		(pt 0 16)
+		(input)
+		(text "IN" (rect 2 7 13 19)(font "Courier New" (bold))(invisible))
+		(text "IN" (rect 2 7 13 19)(font "Courier New" (bold))(invisible))
+		(line (pt 0 16)(pt 13 16)(line_width 1))
+	)
+	(port
+		(pt 48 16)
+		(output)
+		(text "OUT" (rect 32 7 49 19)(font "Courier New" (bold))(invisible))
+		(text "OUT" (rect 32 7 49 19)(font "Courier New" (bold))(invisible))
+		(line (pt 39 16)(pt 48 16)(line_width 1))
+	)
+	(drawing
+		(line (pt 13 25)(pt 13 7)(line_width 1))
+		(line (pt 13 7)(pt 31 16)(line_width 1))
+		(line (pt 13 25)(pt 31 16)(line_width 1))
+		(circle (rect 31 12 39 20)(line_width 1))
+	)
+)
 (connector
 	(pt 2952 1408)
 	(pt 3016 1408)
@@ -4393,14 +4418,6 @@ applicable agreement for further details.
 	(pt 2840 1072)
 	(color 0 0 0)
 )
-(connector
-	(pt 2328 1416)
-	(pt 2328 1320)
-)
-(connector
-	(pt 2328 1320)
-	(pt 2296 1320)
-)
 (connector
 	(pt 3160 896)
 	(pt 3000 896)
@@ -5315,6 +5332,18 @@ applicable agreement for further details.
 	(pt 800 216)
 	(pt 848 216)
 )
+(connector
+	(pt 2328 1416)
+	(pt 2328 1320)
+)
+(connector
+	(pt 2088 1320)
+	(pt 2176 1320)
+)
+(connector
+	(pt 2224 1320)
+	(pt 2328 1320)
+)
 (junction (pt 2856 1120))
 (junction (pt 2872 1136))
 (junction (pt 2888 1152))
@@ -5396,15 +5425,15 @@ applicable agreement for further details.
 (text "Clock" (rect 1544 408 1647 444)(font "Arial" (color 0 128 0)(font_size 24)(bold_italic)))
 (text "Clear" (rect 1544 312 1638 348)(font "Arial" (color 0 0 0)(font_size 24)(bold_italic)))
 (text "BUS: Data from Z" (rect 1992 1232 2305 1268)(font "Arial" (color 128 0 128)(font_size 24)(bold_italic)))
-(text "BUS: Data from MDR" (rect 1992 648 2368 684)(font "Arial" (color 128 0 128)(font_size 24)(bold_italic)))
 (text "BUS: Data from PC" (rect 1000 2144 1342 2180)(font "Arial" (color 128 0 128)(font_size 24)(bold_italic)))
 (text "BUS: Data from General Registers" (rect 832 1776 1447 1812)(font "Arial" (color 128 0 128)(font_size 24)(bold_italic)))
 (text "Clock" (rect 1544 200 1647 236)(font "Arial" (color 0 128 0)(font_size 24)(bold_italic)))
 (text "Clock" (rect 1076 576 1112 679)(font "Arial" (color 0 128 0)(font_size 24)(bold_italic))(vertical))
 (text "Clear" (rect 1196 574 1232 668)(font "Arial" (color 0 0 0)(font_size 24)(bold_italic))(vertical))
-(rectangle (rect 408 864 1640 1776)(color 255 70 153)(line_width 5)(fill (color 255 225 239)))
-(rectangle (rect 2848 840 3536 1480)(color 255 152 60)(line_width 5)(fill (color 255 235 217)))
-(rectangle (rect 2848 1488 3488 1856)(color 106 200 255)(line_width 5)(fill (color 208 238 255)))
-(rectangle (rect 448 176 1032 648)(color 106 200 255)(line_width 5)(fill (color 208 238 255)))
-(rectangle (rect 1656 1392 2312 1792)(color 22 254 162)(line_width 5)(fill (color 174 255 223)))
-(rectangle (rect 2320 1248 2832 1792)(color 130 94 255)(line_width 5)(fill (color 237 232 255)))
+(text "BUS: Data from MDR" (rect 1992 648 2368 684)(font "Arial" (color 128 0 128)(font_size 24)(bold_italic)))
+(rectangle (rect 2848 840 3536 1480)(color 255 152 60)(line_width 5))
+(rectangle (rect 2848 1488 3488 1856)(color 106 200 255)(line_width 5))
+(rectangle (rect 2320 1248 2832 1792)(color 130 94 255)(line_width 5))
+(rectangle (rect 1656 1392 2312 1792)(color 22 254 162)(line_width 5))
+(rectangle (rect 408 864 1640 1776)(color 255 70 153)(line_width 5))
+(rectangle (rect 448 176 1032 648)(color 106 200 255)(line_width 5))