diff --git a/instructions.xlsx b/instructions.xlsx
index 5c1c674..5d9feba 100644
Binary files a/instructions.xlsx and b/instructions.xlsx differ
diff --git a/machine_alpha/MDR_8b.bdf b/machine_alpha/MDR_8b.bdf
new file mode 100644
index 0000000..ba85e26
--- /dev/null
+++ b/machine_alpha/MDR_8b.bdf
@@ -0,0 +1,1671 @@
+/*
+WARNING: Do NOT edit the input and output ports in this file in a text
+editor if you plan to continue editing the block that represents it in
+the Block Editor! File corruption is VERY likely to occur.
+*/
+/*
+Copyright (C) 1991-2009 Altera Corporation
+Your use of Altera Corporation's design tools, logic functions 
+and other software and tools, and its AMPP partner logic 
+functions, and any output files from any of the foregoing 
+(including device programming or simulation files), and any 
+associated documentation or information are expressly subject 
+to the terms and conditions of the Altera Program License 
+Subscription Agreement, Altera MegaCore Function License 
+Agreement, or other applicable license agreement, including, 
+without limitation, that your use is for the sole purpose of 
+programming logic devices manufactured by Altera and sold by 
+Altera or its authorized distributors.  Please refer to the 
+applicable agreement for further details.
+*/
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diff --git a/machine_alpha/MDR_8b.bsf b/machine_alpha/MDR_8b.bsf
new file mode 100644
index 0000000..6b69fc1
--- /dev/null
+++ b/machine_alpha/MDR_8b.bsf
@@ -0,0 +1,218 @@
+/*
+WARNING: Do NOT edit the input and output ports in this file in a text
+editor if you plan to continue editing the block that represents it in
+the Block Editor! File corruption is VERY likely to occur.
+*/
+/*
+Copyright (C) 1991-2009 Altera Corporation
+Your use of Altera Corporation's design tools, logic functions 
+and other software and tools, and its AMPP partner logic 
+functions, and any output files from any of the foregoing 
+(including device programming or simulation files), and any 
+associated documentation or information are expressly subject 
+to the terms and conditions of the Altera Program License 
+Subscription Agreement, Altera MegaCore Function License 
+Agreement, or other applicable license agreement, including, 
+without limitation, that your use is for the sole purpose of 
+programming logic devices manufactured by Altera and sold by 
+Altera or its authorized distributors.  Please refer to the 
+applicable agreement for further details.
+*/
+(header "symbol" (version "1.1"))
+(symbol
+	(rect 64 64 240 304)
+	(text "MDR_8b" (rect 5 0 52 14)(font "Arial" (font_size 8)))
+	(text "inst" (rect 8 224 25 236)(font "Arial" ))
+	(port
+		(pt 0 48)
+		(input)
+		(text "CLR" (rect 0 0 23 14)(font "Arial" (font_size 8)))
+		(text "CLR" (rect 21 43 44 57)(font "Arial" (font_size 8)))
+		(line (pt 0 48)(pt 16 48)(line_width 1))
+	)
+	(port
+		(pt 0 64)
+		(input)
+		(text "CP" (rect 0 0 15 14)(font "Arial" (font_size 8)))
+		(text "CP" (rect 21 59 36 73)(font "Arial" (font_size 8)))
+		(line (pt 0 64)(pt 16 64)(line_width 1))
+	)
+	(port
+		(pt 0 80)
+		(input)
+		(text "D7" (rect 0 0 15 14)(font "Arial" (font_size 8)))
+		(text "D7" (rect 21 75 36 89)(font "Arial" (font_size 8)))
+		(line (pt 0 80)(pt 16 80)(line_width 1))
+	)
+	(port
+		(pt 0 96)
+		(input)
+		(text "D6" (rect 0 0 15 14)(font "Arial" (font_size 8)))
+		(text "D6" (rect 21 91 36 105)(font "Arial" (font_size 8)))
+		(line (pt 0 96)(pt 16 96)(line_width 1))
+	)
+	(port
+		(pt 0 112)
+		(input)
+		(text "D5" (rect 0 0 15 14)(font "Arial" (font_size 8)))
+		(text "D5" (rect 21 107 36 121)(font "Arial" (font_size 8)))
+		(line (pt 0 112)(pt 16 112)(line_width 1))
+	)
+	(port
+		(pt 0 128)
+		(input)
+		(text "D4" (rect 0 0 15 14)(font "Arial" (font_size 8)))
+		(text "D4" (rect 21 123 36 137)(font "Arial" (font_size 8)))
+		(line (pt 0 128)(pt 16 128)(line_width 1))
+	)
+	(port
+		(pt 0 144)
+		(input)
+		(text "D3" (rect 0 0 15 14)(font "Arial" (font_size 8)))
+		(text "D3" (rect 21 139 36 153)(font "Arial" (font_size 8)))
+		(line (pt 0 144)(pt 16 144)(line_width 1))
+	)
+	(port
+		(pt 0 160)
+		(input)
+		(text "D2" (rect 0 0 15 14)(font "Arial" (font_size 8)))
+		(text "D2" (rect 21 155 36 169)(font "Arial" (font_size 8)))
+		(line (pt 0 160)(pt 16 160)(line_width 1))
+	)
+	(port
+		(pt 0 176)
+		(input)
+		(text "D1" (rect 0 0 15 14)(font "Arial" (font_size 8)))
+		(text "D1" (rect 21 171 36 185)(font "Arial" (font_size 8)))
+		(line (pt 0 176)(pt 16 176)(line_width 1))
+	)
+	(port
+		(pt 0 192)
+		(input)
+		(text "D0" (rect 0 0 15 14)(font "Arial" (font_size 8)))
+		(text "D0" (rect 21 187 36 201)(font "Arial" (font_size 8)))
+		(line (pt 0 192)(pt 16 192)(line_width 1))
+	)
+	(port
+		(pt 0 208)
+		(input)
+		(text "BUS_EN" (rect 0 0 47 14)(font "Arial" (font_size 8)))
+		(text "BUS_EN" (rect 21 203 68 217)(font "Arial" (font_size 8)))
+		(line (pt 0 208)(pt 16 208)(line_width 1))
+	)
+	(port
+		(pt 32 0)
+		(output)
+		(text "Q7" (rect 208 0 224 14)(font "Arial" (font_size 8)))
+		(text "Q7" (rect 24 24 38 40)(font "Arial" (font_size 8))(vertical))
+		(line (pt 32 0)(pt 32 16)(line_width 1))
+	)
+	(port
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+		(text "Q6" (rect 208 0 224 14)(font "Arial" (font_size 8)))
+		(text "Q6" (rect 40 24 54 40)(font "Arial" (font_size 8))(vertical))
+		(line (pt 48 0)(pt 48 16)(line_width 1))
+	)
+	(port
+		(pt 64 0)
+		(output)
+		(text "Q5" (rect 208 0 224 14)(font "Arial" (font_size 8)))
+		(text "Q5" (rect 56 24 70 40)(font "Arial" (font_size 8))(vertical))
+		(line (pt 64 0)(pt 64 16)(line_width 1))
+	)
+	(port
+		(pt 80 0)
+		(output)
+		(text "Q4" (rect 208 0 224 14)(font "Arial" (font_size 8)))
+		(text "Q4" (rect 72 24 86 40)(font "Arial" (font_size 8))(vertical))
+		(line (pt 80 0)(pt 80 16)(line_width 1))
+	)
+	(port
+		(pt 96 0)
+		(output)
+		(text "Q3" (rect 208 0 224 14)(font "Arial" (font_size 8)))
+		(text "Q3" (rect 88 24 102 40)(font "Arial" (font_size 8))(vertical))
+		(line (pt 96 0)(pt 96 16)(line_width 1))
+	)
+	(port
+		(pt 112 0)
+		(output)
+		(text "Q2" (rect 208 0 224 14)(font "Arial" (font_size 8)))
+		(text "Q2" (rect 104 24 118 40)(font "Arial" (font_size 8))(vertical))
+		(line (pt 112 0)(pt 112 16)(line_width 1))
+	)
+	(port
+		(pt 128 0)
+		(output)
+		(text "Q1" (rect 208 0 224 14)(font "Arial" (font_size 8)))
+		(text "Q1" (rect 120 24 134 40)(font "Arial" (font_size 8))(vertical))
+		(line (pt 128 0)(pt 128 16)(line_width 1))
+	)
+	(port
+		(pt 144 0)
+		(output)
+		(text "Q0" (rect 208 0 224 14)(font "Arial" (font_size 8)))
+		(text "Q0" (rect 136 24 150 40)(font "Arial" (font_size 8))(vertical))
+		(line (pt 144 0)(pt 144 16)(line_width 1))
+	)
+	(port
+		(pt 176 80)
+		(bidir)
+		(text "M7" (rect 56 0 72 14)(font "Arial" (font_size 8)))
+		(text "M7" (rect 139 75 155 89)(font "Arial" (font_size 8)))
+		(line (pt 176 80)(pt 160 80)(line_width 1))
+	)
+	(port
+		(pt 176 96)
+		(bidir)
+		(text "M6" (rect 56 0 72 14)(font "Arial" (font_size 8)))
+		(text "M6" (rect 139 91 155 105)(font "Arial" (font_size 8)))
+		(line (pt 176 96)(pt 160 96)(line_width 1))
+	)
+	(port
+		(pt 176 112)
+		(bidir)
+		(text "M5" (rect 56 0 72 14)(font "Arial" (font_size 8)))
+		(text "M5" (rect 139 107 155 121)(font "Arial" (font_size 8)))
+		(line (pt 176 112)(pt 160 112)(line_width 1))
+	)
+	(port
+		(pt 176 128)
+		(bidir)
+		(text "M4" (rect 56 0 72 14)(font "Arial" (font_size 8)))
+		(text "M4" (rect 139 123 155 137)(font "Arial" (font_size 8)))
+		(line (pt 176 128)(pt 160 128)(line_width 1))
+	)
+	(port
+		(pt 176 144)
+		(bidir)
+		(text "M3" (rect 56 0 72 14)(font "Arial" (font_size 8)))
+		(text "M3" (rect 139 139 155 153)(font "Arial" (font_size 8)))
+		(line (pt 176 144)(pt 160 144)(line_width 1))
+	)
+	(port
+		(pt 176 160)
+		(bidir)
+		(text "M2" (rect 56 0 72 14)(font "Arial" (font_size 8)))
+		(text "M2" (rect 139 155 155 169)(font "Arial" (font_size 8)))
+		(line (pt 176 160)(pt 160 160)(line_width 1))
+	)
+	(port
+		(pt 176 176)
+		(bidir)
+		(text "M1" (rect 56 0 72 14)(font "Arial" (font_size 8)))
+		(text "M1" (rect 139 171 155 185)(font "Arial" (font_size 8)))
+		(line (pt 176 176)(pt 160 176)(line_width 1))
+	)
+	(port
+		(pt 176 192)
+		(bidir)
+		(text "M0" (rect 56 0 72 14)(font "Arial" (font_size 8)))
+		(text "M0" (rect 139 187 155 201)(font "Arial" (font_size 8)))
+		(line (pt 176 192)(pt 160 192)(line_width 1))
+	)
+	(drawing
+		(rectangle (rect 16 16 160 224)(line_width 1))
+	)
+)
diff --git a/machine_alpha/machine_alpha.bdf b/machine_alpha/machine_alpha.bdf
index 087ac0c..a3ba097 100644
--- a/machine_alpha/machine_alpha.bdf
+++ b/machine_alpha/machine_alpha.bdf
@@ -121,7 +121,7 @@ applicable agreement for further details.
 )
 (pin
 	(input)
-	(rect 2496 1624 2664 1640)
+	(rect 2104 848 2272 864)
 	(text "INPUT" (rect 133 0 161 10)(font "Arial" (font_size 6)))
 	(text "uIR7" (rect 5 0 28 12)(font "Arial" ))
 	(pt 168 8)
@@ -151,9 +151,57 @@ applicable agreement for further details.
 	)
 	(text "VCC" (rect 136 7 156 17)(font "Arial" (font_size 6)))
 )
+(pin
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+	(rect 1048 1448 1216 1464)
+	(text "INPUT" (rect 133 0 161 10)(font "Arial" (font_size 6)))
+	(text "uIR8" (rect 5 0 28 12)(font "Arial" ))
+	(pt 168 8)
+	(drawing
+		(line (pt 92 12)(pt 117 12)(line_width 1))
+		(line (pt 92 4)(pt 117 4)(line_width 1))
+		(line (pt 121 8)(pt 168 8)(line_width 1))
+		(line (pt 92 12)(pt 92 4)(line_width 1))
+		(line (pt 117 4)(pt 121 8)(line_width 1))
+		(line (pt 117 12)(pt 121 8)(line_width 1))
+	)
+	(text "VCC" (rect 136 7 156 17)(font "Arial" (font_size 6)))
+)
+(pin
+	(input)
+	(rect 1048 1432 1216 1448)
+	(text "INPUT" (rect 133 0 161 10)(font "Arial" (font_size 6)))
+	(text "uIR9" (rect 5 0 28 12)(font "Arial" ))
+	(pt 168 8)
+	(drawing
+		(line (pt 92 12)(pt 117 12)(line_width 1))
+		(line (pt 92 4)(pt 117 4)(line_width 1))
+		(line (pt 121 8)(pt 168 8)(line_width 1))
+		(line (pt 92 12)(pt 92 4)(line_width 1))
+		(line (pt 117 4)(pt 121 8)(line_width 1))
+		(line (pt 117 12)(pt 121 8)(line_width 1))
+	)
+	(text "VCC" (rect 136 7 156 17)(font "Arial" (font_size 6)))
+)
+(pin
+	(input)
+	(rect 3000 856 3168 872)
+	(text "INPUT" (rect 133 0 161 10)(font "Arial" (font_size 6)))
+	(text "uIR_17" (rect 5 0 40 12)(font "Arial" ))
+	(pt 168 8)
+	(drawing
+		(line (pt 92 12)(pt 117 12)(line_width 1))
+		(line (pt 92 4)(pt 117 4)(line_width 1))
+		(line (pt 121 8)(pt 168 8)(line_width 1))
+		(line (pt 92 12)(pt 92 4)(line_width 1))
+		(line (pt 117 4)(pt 121 8)(line_width 1))
+		(line (pt 117 12)(pt 121 8)(line_width 1))
+	)
+	(text "VCC" (rect 136 7 156 17)(font "Arial" (font_size 6)))
+)
 (pin
 	(output)
-	(rect 3696 1312 3872 1328)
+	(rect 3432 1256 3608 1272)
 	(text "OUTPUT" (rect 1 0 39 10)(font "Arial" (font_size 6)))
 	(text "RAM_A0" (rect 90 0 132 12)(font "Arial" ))
 	(pt 0 8)
@@ -169,7 +217,7 @@ applicable agreement for further details.
 )
 (pin
 	(output)
-	(rect 3696 1296 3872 1312)
+	(rect 3432 1240 3608 1256)
 	(text "OUTPUT" (rect 1 0 39 10)(font "Arial" (font_size 6)))
 	(text "RAM_A1" (rect 90 0 132 12)(font "Arial" ))
 	(pt 0 8)
@@ -185,7 +233,7 @@ applicable agreement for further details.
 )
 (pin
 	(output)
-	(rect 3696 1280 3872 1296)
+	(rect 3432 1224 3608 1240)
 	(text "OUTPUT" (rect 1 0 39 10)(font "Arial" (font_size 6)))
 	(text "RAM_A2" (rect 90 0 132 12)(font "Arial" ))
 	(pt 0 8)
@@ -201,7 +249,7 @@ applicable agreement for further details.
 )
 (pin
 	(output)
-	(rect 3696 1264 3872 1280)
+	(rect 3432 1208 3608 1224)
 	(text "OUTPUT" (rect 1 0 39 10)(font "Arial" (font_size 6)))
 	(text "RAM_A3" (rect 90 0 132 12)(font "Arial" ))
 	(pt 0 8)
@@ -217,7 +265,7 @@ applicable agreement for further details.
 )
 (pin
 	(output)
-	(rect 3696 1248 3872 1264)
+	(rect 3432 1192 3608 1208)
 	(text "OUTPUT" (rect 1 0 39 10)(font "Arial" (font_size 6)))
 	(text "RAM_A4" (rect 90 0 132 12)(font "Arial" ))
 	(pt 0 8)
@@ -233,7 +281,7 @@ applicable agreement for further details.
 )
 (pin
 	(output)
-	(rect 3696 1232 3872 1248)
+	(rect 3432 1176 3608 1192)
 	(text "OUTPUT" (rect 1 0 39 10)(font "Arial" (font_size 6)))
 	(text "RAM_A5" (rect 90 0 132 12)(font "Arial" ))
 	(pt 0 8)
@@ -249,7 +297,7 @@ applicable agreement for further details.
 )
 (pin
 	(output)
-	(rect 3696 1216 3872 1232)
+	(rect 3432 1160 3608 1176)
 	(text "OUTPUT" (rect 1 0 39 10)(font "Arial" (font_size 6)))
 	(text "RAM_A6" (rect 90 0 132 12)(font "Arial" ))
 	(pt 0 8)
@@ -265,7 +313,7 @@ applicable agreement for further details.
 )
 (pin
 	(output)
-	(rect 3696 1200 3872 1216)
+	(rect 3432 1144 3608 1160)
 	(text "OUTPUT" (rect 1 0 39 10)(font "Arial" (font_size 6)))
 	(text "RAM_A7" (rect 90 0 132 12)(font "Arial" ))
 	(pt 0 8)
@@ -489,7 +537,7 @@ applicable agreement for further details.
 )
 (pin
 	(bidir)
-	(rect 4456 1320 4632 1336)
+	(rect 3680 848 3856 864)
 	(text "BIDIR" (rect 1 0 25 10)(font "Arial" (font_size 6)))
 	(text "RAM_D0" (rect 90 0 133 12)(font "Arial" ))
 	(pt 0 8)
@@ -506,7 +554,7 @@ applicable agreement for further details.
 )
 (pin
 	(bidir)
-	(rect 4456 1304 4632 1320)
+	(rect 3680 832 3856 848)
 	(text "BIDIR" (rect 1 0 25 10)(font "Arial" (font_size 6)))
 	(text "RAM_D1" (rect 90 0 133 12)(font "Arial" ))
 	(pt 0 8)
@@ -523,7 +571,7 @@ applicable agreement for further details.
 )
 (pin
 	(bidir)
-	(rect 4456 1288 4632 1304)
+	(rect 3680 816 3856 832)
 	(text "BIDIR" (rect 1 0 25 10)(font "Arial" (font_size 6)))
 	(text "RAM_D2" (rect 90 0 133 12)(font "Arial" ))
 	(pt 0 8)
@@ -540,7 +588,7 @@ applicable agreement for further details.
 )
 (pin
 	(bidir)
-	(rect 4456 1272 4632 1288)
+	(rect 3680 800 3856 816)
 	(text "BIDIR" (rect 1 0 25 10)(font "Arial" (font_size 6)))
 	(text "RAM_D3" (rect 90 0 133 12)(font "Arial" ))
 	(pt 0 8)
@@ -557,7 +605,7 @@ applicable agreement for further details.
 )
 (pin
 	(bidir)
-	(rect 4456 1256 4632 1272)
+	(rect 3680 784 3856 800)
 	(text "BIDIR" (rect 1 0 25 10)(font "Arial" (font_size 6)))
 	(text "RAM_D4" (rect 90 0 133 12)(font "Arial" ))
 	(pt 0 8)
@@ -574,7 +622,7 @@ applicable agreement for further details.
 )
 (pin
 	(bidir)
-	(rect 4456 1240 4632 1256)
+	(rect 3680 768 3856 784)
 	(text "BIDIR" (rect 1 0 25 10)(font "Arial" (font_size 6)))
 	(text "RAM_D5" (rect 90 0 133 12)(font "Arial" ))
 	(pt 0 8)
@@ -591,7 +639,7 @@ applicable agreement for further details.
 )
 (pin
 	(bidir)
-	(rect 4456 1224 4632 1240)
+	(rect 3680 752 3856 768)
 	(text "BIDIR" (rect 1 0 25 10)(font "Arial" (font_size 6)))
 	(text "RAM_D6" (rect 90 0 133 12)(font "Arial" ))
 	(pt 0 8)
@@ -608,7 +656,7 @@ applicable agreement for further details.
 )
 (pin
 	(bidir)
-	(rect 4456 1208 4632 1224)
+	(rect 3680 736 3856 752)
 	(text "BIDIR" (rect 1 0 25 10)(font "Arial" (font_size 6)))
 	(text "RAM_D7" (rect 90 0 133 12)(font "Arial" ))
 	(pt 0 8)
@@ -624,7 +672,7 @@ applicable agreement for further details.
 	(text "VCC" (rect 4 7 24 17)(font "Arial" (font_size 6)))
 )
 (symbol
-	(rect 2696 1400 2792 1624)
+	(rect 2752 704 2848 928)
 	(text "counter_8b_with_input" (rect 5 0 135 14)(font "Arial" (font_size 8)))
 	(text "PC" (rect 8 208 23 220)(font "Arial" ))
 	(port
@@ -764,429 +812,6 @@ applicable agreement for further details.
 		(rectangle (rect 16 16 80 208)(line_width 1))
 	)
 )
-(symbol
-	(rect 3448 1176 3544 1400)
-	(text "register_8b_with_switch" (rect 5 0 147 14)(font "Arial" (font_size 8)))
-	(text "MAR" (rect 8 208 31 220)(font "Arial" ))
-	(port
-		(pt 0 32)
-		(input)
-		(text "EN" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "EN" (rect 21 27 36 41)(font "Arial" (font_size 8)))
-		(line (pt 0 32)(pt 16 32)(line_width 1))
-	)
-	(port
-		(pt 0 48)
-		(input)
-		(text "CLR" (rect 0 0 23 14)(font "Arial" (font_size 8)))
-		(text "CLR" (rect 21 43 44 57)(font "Arial" (font_size 8)))
-		(line (pt 0 48)(pt 16 48)(line_width 1))
-	)
-	(port
-		(pt 0 64)
-		(input)
-		(text "CP" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "CP" (rect 21 59 36 73)(font "Arial" (font_size 8)))
-		(line (pt 0 64)(pt 16 64)(line_width 1))
-	)
-	(port
-		(pt 0 80)
-		(input)
-		(text "D7" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "D7" (rect 21 75 36 89)(font "Arial" (font_size 8)))
-		(line (pt 0 80)(pt 16 80)(line_width 1))
-	)
-	(port
-		(pt 0 96)
-		(input)
-		(text "D6" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "D6" (rect 21 91 36 105)(font "Arial" (font_size 8)))
-		(line (pt 0 96)(pt 16 96)(line_width 1))
-	)
-	(port
-		(pt 0 112)
-		(input)
-		(text "D5" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "D5" (rect 21 107 36 121)(font "Arial" (font_size 8)))
-		(line (pt 0 112)(pt 16 112)(line_width 1))
-	)
-	(port
-		(pt 0 128)
-		(input)
-		(text "D4" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "D4" (rect 21 123 36 137)(font "Arial" (font_size 8)))
-		(line (pt 0 128)(pt 16 128)(line_width 1))
-	)
-	(port
-		(pt 0 144)
-		(input)
-		(text "D3" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "D3" (rect 21 139 36 153)(font "Arial" (font_size 8)))
-		(line (pt 0 144)(pt 16 144)(line_width 1))
-	)
-	(port
-		(pt 0 160)
-		(input)
-		(text "D2" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "D2" (rect 21 155 36 169)(font "Arial" (font_size 8)))
-		(line (pt 0 160)(pt 16 160)(line_width 1))
-	)
-	(port
-		(pt 0 176)
-		(input)
-		(text "D1" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "D1" (rect 21 171 36 185)(font "Arial" (font_size 8)))
-		(line (pt 0 176)(pt 16 176)(line_width 1))
-	)
-	(port
-		(pt 0 192)
-		(input)
-		(text "D0" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "D0" (rect 21 187 36 201)(font "Arial" (font_size 8)))
-		(line (pt 0 192)(pt 16 192)(line_width 1))
-	)
-	(port
-		(pt 96 32)
-		(output)
-		(text "Q7" (rect 0 0 16 14)(font "Arial" (font_size 8)))
-		(text "Q7" (rect 59 27 75 41)(font "Arial" (font_size 8)))
-		(line (pt 96 32)(pt 80 32)(line_width 1))
-	)
-	(port
-		(pt 96 48)
-		(output)
-		(text "Q6" (rect 0 0 16 14)(font "Arial" (font_size 8)))
-		(text "Q6" (rect 59 43 75 57)(font "Arial" (font_size 8)))
-		(line (pt 96 48)(pt 80 48)(line_width 1))
-	)
-	(port
-		(pt 96 64)
-		(output)
-		(text "Q5" (rect 0 0 16 14)(font "Arial" (font_size 8)))
-		(text "Q5" (rect 59 59 75 73)(font "Arial" (font_size 8)))
-		(line (pt 96 64)(pt 80 64)(line_width 1))
-	)
-	(port
-		(pt 96 80)
-		(output)
-		(text "Q4" (rect 0 0 16 14)(font "Arial" (font_size 8)))
-		(text "Q4" (rect 59 75 75 89)(font "Arial" (font_size 8)))
-		(line (pt 96 80)(pt 80 80)(line_width 1))
-	)
-	(port
-		(pt 96 96)
-		(output)
-		(text "Q3" (rect 0 0 16 14)(font "Arial" (font_size 8)))
-		(text "Q3" (rect 59 91 75 105)(font "Arial" (font_size 8)))
-		(line (pt 96 96)(pt 80 96)(line_width 1))
-	)
-	(port
-		(pt 96 112)
-		(output)
-		(text "Q2" (rect 0 0 16 14)(font "Arial" (font_size 8)))
-		(text "Q2" (rect 59 107 75 121)(font "Arial" (font_size 8)))
-		(line (pt 96 112)(pt 80 112)(line_width 1))
-	)
-	(port
-		(pt 96 128)
-		(output)
-		(text "Q1" (rect 0 0 16 14)(font "Arial" (font_size 8)))
-		(text "Q1" (rect 59 123 75 137)(font "Arial" (font_size 8)))
-		(line (pt 96 128)(pt 80 128)(line_width 1))
-	)
-	(port
-		(pt 96 144)
-		(output)
-		(text "Q0" (rect 0 0 16 14)(font "Arial" (font_size 8)))
-		(text "Q0" (rect 59 139 75 153)(font "Arial" (font_size 8)))
-		(line (pt 96 144)(pt 80 144)(line_width 1))
-	)
-	(drawing
-		(rectangle (rect 16 16 80 208)(line_width 1))
-	)
-)
-(symbol
-	(rect 4184 1184 4280 1408)
-	(text "register_8b_with_switch" (rect 5 0 147 14)(font "Arial" (font_size 8)))
-	(text "MDR" (rect 8 208 32 220)(font "Arial" ))
-	(port
-		(pt 0 32)
-		(input)
-		(text "EN" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "EN" (rect 21 27 36 41)(font "Arial" (font_size 8)))
-		(line (pt 0 32)(pt 16 32)(line_width 1))
-	)
-	(port
-		(pt 0 48)
-		(input)
-		(text "CLR" (rect 0 0 23 14)(font "Arial" (font_size 8)))
-		(text "CLR" (rect 21 43 44 57)(font "Arial" (font_size 8)))
-		(line (pt 0 48)(pt 16 48)(line_width 1))
-	)
-	(port
-		(pt 0 64)
-		(input)
-		(text "CP" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "CP" (rect 21 59 36 73)(font "Arial" (font_size 8)))
-		(line (pt 0 64)(pt 16 64)(line_width 1))
-	)
-	(port
-		(pt 0 80)
-		(input)
-		(text "D7" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "D7" (rect 21 75 36 89)(font "Arial" (font_size 8)))
-		(line (pt 0 80)(pt 16 80)(line_width 1))
-	)
-	(port
-		(pt 0 96)
-		(input)
-		(text "D6" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "D6" (rect 21 91 36 105)(font "Arial" (font_size 8)))
-		(line (pt 0 96)(pt 16 96)(line_width 1))
-	)
-	(port
-		(pt 0 112)
-		(input)
-		(text "D5" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "D5" (rect 21 107 36 121)(font "Arial" (font_size 8)))
-		(line (pt 0 112)(pt 16 112)(line_width 1))
-	)
-	(port
-		(pt 0 128)
-		(input)
-		(text "D4" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "D4" (rect 21 123 36 137)(font "Arial" (font_size 8)))
-		(line (pt 0 128)(pt 16 128)(line_width 1))
-	)
-	(port
-		(pt 0 144)
-		(input)
-		(text "D3" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "D3" (rect 21 139 36 153)(font "Arial" (font_size 8)))
-		(line (pt 0 144)(pt 16 144)(line_width 1))
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-		(text "D2" (rect 21 155 36 169)(font "Arial" (font_size 8)))
-		(line (pt 0 160)(pt 16 160)(line_width 1))
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-	(port
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-		(text "D1" (rect 21 171 36 185)(font "Arial" (font_size 8)))
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-		(text "D0" (rect 21 187 36 201)(font "Arial" (font_size 8)))
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-		(pt 96 32)
-		(output)
-		(text "Q7" (rect 0 0 16 14)(font "Arial" (font_size 8)))
-		(text "Q7" (rect 59 27 75 41)(font "Arial" (font_size 8)))
-		(line (pt 96 32)(pt 80 32)(line_width 1))
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-	(port
-		(pt 96 48)
-		(output)
-		(text "Q6" (rect 0 0 16 14)(font "Arial" (font_size 8)))
-		(text "Q6" (rect 59 43 75 57)(font "Arial" (font_size 8)))
-		(line (pt 96 48)(pt 80 48)(line_width 1))
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-		(pt 96 64)
-		(output)
-		(text "Q5" (rect 0 0 16 14)(font "Arial" (font_size 8)))
-		(text "Q5" (rect 59 59 75 73)(font "Arial" (font_size 8)))
-		(line (pt 96 64)(pt 80 64)(line_width 1))
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-	(port
-		(pt 96 80)
-		(output)
-		(text "Q4" (rect 0 0 16 14)(font "Arial" (font_size 8)))
-		(text "Q4" (rect 59 75 75 89)(font "Arial" (font_size 8)))
-		(line (pt 96 80)(pt 80 80)(line_width 1))
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-	(port
-		(pt 96 96)
-		(output)
-		(text "Q3" (rect 0 0 16 14)(font "Arial" (font_size 8)))
-		(text "Q3" (rect 59 91 75 105)(font "Arial" (font_size 8)))
-		(line (pt 96 96)(pt 80 96)(line_width 1))
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-	(port
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-		(output)
-		(text "Q2" (rect 0 0 16 14)(font "Arial" (font_size 8)))
-		(text "Q2" (rect 59 107 75 121)(font "Arial" (font_size 8)))
-		(line (pt 96 112)(pt 80 112)(line_width 1))
-	)
-	(port
-		(pt 96 128)
-		(output)
-		(text "Q1" (rect 0 0 16 14)(font "Arial" (font_size 8)))
-		(text "Q1" (rect 59 123 75 137)(font "Arial" (font_size 8)))
-		(line (pt 96 128)(pt 80 128)(line_width 1))
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-	(port
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-		(output)
-		(text "Q0" (rect 0 0 16 14)(font "Arial" (font_size 8)))
-		(text "Q0" (rect 59 139 75 153)(font "Arial" (font_size 8)))
-		(line (pt 96 144)(pt 80 144)(line_width 1))
-	)
-	(drawing
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-)
-(symbol
-	(rect 3160 1408 3256 1632)
-	(text "register_8b_with_switch" (rect 5 0 147 14)(font "Arial" (font_size 8)))
-	(text "IR" (rect 8 208 19 220)(font "Arial" ))
-	(port
-		(pt 0 32)
-		(input)
-		(text "EN" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "EN" (rect 21 27 36 41)(font "Arial" (font_size 8)))
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-		(input)
-		(text "CLR" (rect 0 0 23 14)(font "Arial" (font_size 8)))
-		(text "CLR" (rect 21 43 44 57)(font "Arial" (font_size 8)))
-		(line (pt 0 48)(pt 16 48)(line_width 1))
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-	(port
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-		(text "CP" (rect 0 0 15 14)(font "Arial" (font_size 8)))
-		(text "CP" (rect 21 59 36 73)(font "Arial" (font_size 8)))
-		(line (pt 0 64)(pt 16 64)(line_width 1))
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-		(text "D7" (rect 21 75 36 89)(font "Arial" (font_size 8)))
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 	(text "GND" (rect 8 6 29 16)(font "Arial" (font_size 6)))
@@ -2877,69 +2502,470 @@ applicable agreement for further details.
 	)
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+		(line (pt 96 80)(pt 80 80)(line_width 1))
+	)
+	(port
+		(pt 96 96)
+		(output)
+		(text "Q3" (rect 0 0 16 14)(font "Arial" (font_size 8)))
+		(text "Q3" (rect 59 91 75 105)(font "Arial" (font_size 8)))
+		(line (pt 96 96)(pt 80 96)(line_width 1))
+	)
+	(port
+		(pt 96 112)
+		(output)
+		(text "Q2" (rect 0 0 16 14)(font "Arial" (font_size 8)))
+		(text "Q2" (rect 59 107 75 121)(font "Arial" (font_size 8)))
+		(line (pt 96 112)(pt 80 112)(line_width 1))
+	)
+	(port
+		(pt 96 128)
+		(output)
+		(text "Q1" (rect 0 0 16 14)(font "Arial" (font_size 8)))
+		(text "Q1" (rect 59 123 75 137)(font "Arial" (font_size 8)))
+		(line (pt 96 128)(pt 80 128)(line_width 1))
+	)
+	(port
+		(pt 96 144)
+		(output)
+		(text "Q0" (rect 0 0 16 14)(font "Arial" (font_size 8)))
+		(text "Q0" (rect 59 139 75 153)(font "Arial" (font_size 8)))
+		(line (pt 96 144)(pt 80 144)(line_width 1))
+	)
+	(drawing
+		(rectangle (rect 16 16 80 208)(line_width 1))
+	)
 )
 (connector
 	(pt 1336 8)
@@ -3073,21 +3099,6 @@ applicable agreement for further details.
 	(pt 1216 8)
 	(pt 1216 -40)
 )
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-	(pt 2696 1592)
-	(pt 2632 1592)
-	(color 0 0 0)
-)
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-	(pt 2632 1592)
-	(pt 2632 424)
-	(color 0 0 0)
-)
-(connector
-	(pt 2064 424)
-	(pt 2632 424)
-	(color 0 0 0)
-)
 (connector
 	(pt 3160 1456)
 	(pt 3144 1456)
@@ -3098,46 +3109,6 @@ applicable agreement for further details.
 	(pt 3144 424)
 	(color 0 0 0)
 )
-(connector
-	(pt 2632 424)
-	(pt 3144 424)
-	(color 0 0 0)
-)
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-	(pt 3400 1224)
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-)
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-)
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-	(pt 4080 424)
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-)
-(connector
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-	(pt 4664 424)
-	(color 0 0 0)
-)
 (connector
 	(pt 1240 56)
 	(pt 1224 56)
@@ -3389,66 +3360,34 @@ applicable agreement for further details.
 	(pt 1368 1120)
 	(pt 1384 1120)
 )
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-	(pt 1384 1120)
-	(pt 1384 992)
-)
 (connector
 	(pt 1368 1136)
 	(pt 1400 1136)
 )
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-	(pt 1400 1008)
-)
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 	(pt 1416 1152)
 )
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-	(pt 1416 1152)
-	(pt 1416 1024)
-)
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 	(pt 1368 1168)
 	(pt 1432 1168)
 )
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-	(pt 1432 1040)
-)
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 	(pt 1368 1184)
 	(pt 1448 1184)
 )
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-	(pt 1448 1056)
-)
 (connector
 	(pt 1368 1200)
 	(pt 1464 1200)
 )
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-	(pt 1464 1072)
-)
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 )
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 	(pt 1368 1232)
 	(pt 1496 1232)
 )
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-	(pt 1496 1232)
-	(pt 1496 1104)
-)
 (connector
 	(pt 1216 -40)
 	(pt 1608 -40)
@@ -3489,170 +3428,10 @@ applicable agreement for further details.
 	(pt 928 864)
 	(pt 768 864)
 )
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-)
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-)
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-	(pt 656 568)
-)
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-	(pt 656 568)
-)
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-	(pt 4344 584)
-)
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-	(pt 4344 584)
-	(pt 672 584)
-)
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-	(pt 672 768)
-	(pt 672 584)
-)
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-	(pt 4336 600)
-)
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-	(pt 4336 600)
-	(pt 688 600)
-)
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-	(pt 688 784)
-	(pt 688 600)
-)
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-	(pt 4328 1264)
-	(pt 4328 616)
-)
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-	(pt 4328 616)
-	(pt 704 616)
-)
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-	(pt 704 800)
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-)
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-	(pt 4296 680)
-)
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-)
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-)
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 	(pt 736 832)
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-)
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-	(pt 4320 1280)
-	(pt 4320 632)
-)
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-	(pt 720 632)
-)
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-)
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-)
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-)
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-	(pt 4456 1216)
-)
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-	(pt 4344 1232)
-)
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-)
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-)
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-)
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-)
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-	(pt 4304 1312)
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-	(pt 4320 1280)
-)
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-	(pt 4320 1280)
-	(pt 4456 1280)
-)
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 	(pt 928 880)
 	(pt 216 880)
@@ -3749,90 +3528,26 @@ applicable agreement for further details.
 	(pt 216 880)
 	(pt 216 1824)
 )
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-	(pt 2800 1544)
-	(pt 2800 2240)
-)
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-	(pt 2808 1528)
-	(pt 2808 2248)
-)
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-	(pt 2816 2256)
-)
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-	(pt 2824 1496)
-	(pt 2824 2264)
-)
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-	(pt 2832 1480)
-	(pt 2832 2272)
-)
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-	(pt 2840 1464)
-	(pt 2840 2280)
-)
-(connector
-	(pt 2848 1448)
-	(pt 2848 2288)
-)
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-	(pt 2856 1432)
-	(pt 2856 2296)
-)
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-	(pt 2800 2240)
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-)
 (connector
 	(pt 768 1360)
 	(pt 768 2240)
 )
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-)
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 	(pt 752 1344)
 	(pt 752 2248)
 )
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-	(pt 2816 2256)
-	(pt 736 2256)
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 	(pt 736 1328)
 	(pt 736 2256)
 )
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-	(pt 2824 2264)
-	(pt 720 2264)
-)
 (connector
 	(pt 720 1312)
 	(pt 720 2264)
 )
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-	(pt 2832 2272)
-	(pt 704 2272)
-)
 (connector
 	(pt 704 1296)
 	(pt 704 2272)
 )
-(connector
-	(pt 2840 2280)
-	(pt 688 2280)
-)
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-	(pt 2848 2288)
-	(pt 672 2288)
-)
-(connector
-	(pt 2856 2296)
-	(pt 656 2296)
-)
 (connector
 	(pt 688 1280)
 	(pt 688 2280)
@@ -3845,38 +3560,6 @@ applicable agreement for further details.
 	(pt 656 1248)
 	(pt 656 2296)
 )
-(connector
-	(pt 328 1936)
-	(pt 2384 1936)
-)
-(connector
-	(pt 312 1920)
-	(pt 2392 1920)
-)
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-	(pt 296 1904)
-	(pt 2400 1904)
-)
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-	(pt 280 1888)
-	(pt 2408 1888)
-)
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-	(pt 2416 1872)
-)
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-	(pt 248 1856)
-	(pt 2424 1856)
-)
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-)
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-	(pt 2440 1824)
-)
 (connector
 	(pt 928 1376)
 	(pt 448 1376)
@@ -3909,422 +3592,14 @@ applicable agreement for further details.
 	(pt 928 1488)
 	(pt 560 1488)
 )
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-)
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-)
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-)
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-)
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-)
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-	(pt 2496 1432)
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-	(pt 2504 1448)
-)
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-	(pt 2512 1464)
-)
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-)
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-	(pt 2528 1496)
-)
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-)
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-)
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-)
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-)
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-)
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-)
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-	(pt 3976 1104)
-	(pt 3976 1376)
-)
 (connector
 	(pt 928 1008)
 	(pt 896 1008)
@@ -4364,230 +3639,10 @@ applicable agreement for further details.
 	(pt 2064 1440)
 	(color 0 0 0)
 )
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-	(pt 560 2104)
-	(pt 2304 2104)
-)
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-	(pt 2312 2088)
-)
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-	(pt 2320 2072)
-)
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-)
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-	(pt 2336 2040)
-)
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-	(pt 480 2024)
-	(pt 2344 2024)
-)
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-	(pt 464 2008)
-	(pt 2352 2008)
-)
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-	(pt 2360 1992)
-)
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-)
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-)
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-)
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-)
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-)
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-)
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-)
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-)
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-	(pt 2352 2008)
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-)
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-	(pt 2360 1992)
-	(pt 2360 1568)
-)
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-	(pt 1384 992)
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-)
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-	(pt 2496 992)
-)
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-	(pt 1400 1008)
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-)
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-	(pt 2504 1008)
-)
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-	(pt 2000 1024)
-)
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+	(pt 3408 824)
+	(pt 3488 824)
+)
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+	(pt 3424 840)
+	(pt 3488 840)
+)
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+	(pt 3440 856)
+	(pt 3488 856)
+)
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+	(pt 3440 1104)
+	(pt 3440 856)
+)
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+	(pt 3480 864)
+	(pt 3480 872)
+)
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+	(pt 3168 864)
+	(pt 3480 864)
+)
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+	(pt 3480 872)
+	(pt 3488 872)
+)
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+	(pt 3144 424)
+	(pt 3304 424)
+)
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+	(pt 3304 424)
+	(pt 3472 424)
+)
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+	(pt 3256 1088)
+	(pt 3424 1088)
+)
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+	(pt 3424 1088)
+	(pt 3888 1088)
+)
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+	(pt 3160 992)
+	(pt 3328 992)
+)
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+	(pt 3328 992)
+	(pt 3888 992)
+)
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+	(pt 3176 1008)
+	(pt 3344 1008)
+)
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+	(pt 3344 1008)
+	(pt 3888 1008)
+)
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+	(pt 3192 1024)
+	(pt 3360 1024)
+)
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+	(pt 3360 1024)
+	(pt 3888 1024)
+)
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+	(pt 3208 1040)
+	(pt 3376 1040)
+)
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+	(pt 3376 1040)
+	(pt 3888 1040)
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+	(pt 3224 1056)
+	(pt 3392 1056)
+)
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+	(pt 3392 1056)
+	(pt 3888 1056)
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+	(pt 3240 1072)
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+	(pt 3408 1072)
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+	(pt 3272 1104)
+	(pt 3440 1104)
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+	(pt 3440 1104)
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 )
-(junction (pt 3048 992))
-(junction (pt 3056 1008))
-(junction (pt 3064 1024))
-(junction (pt 3072 1040))
-(junction (pt 3080 1056))
-(junction (pt 3088 1072))
 (junction (pt 3096 1088))
-(junction (pt 3104 1104))
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-(junction (pt 3280 1008))
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-(junction (pt 4080 424))
 (junction (pt 1360 -248))
 (junction (pt 1360 -232))
 (junction (pt 1360 -216))
@@ -5049,14 +5084,6 @@ applicable agreement for further details.
 (junction (pt 912 1584))
 (junction (pt 912 1600))
 (junction (pt 912 1616))
-(junction (pt 2496 992))
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 (junction (pt 1984 992))
 (junction (pt 1992 1008))
 (junction (pt 2000 1024))
@@ -5069,16 +5096,44 @@ applicable agreement for further details.
 (junction (pt 544 440))
 (junction (pt 600 320))
 (junction (pt 600 456))
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 (text "from MDR" (rect 824 736 879 750)(font "Arial" (font_size 8)))
 (text "from general registers" (rect 776 864 902 878)(font "Arial" (font_size 8)))
 (text "from PC" (rect 792 1232 836 1246)(font "Arial" (font_size 8)))
 (text "from general registers" (rect 792 1360 918 1374)(font "Arial" (font_size 8)))
 (text "BUS" (rect 1480 976 1504 990)(font "Arial" (font_size 8)))
 (text "BUS" (rect 2352 968 2376 982)(font "Arial" (font_size 8)))
-(text "BUS" (rect 3392 968 3416 982)(font "Arial" (font_size 8)))
-(text "BUS" (rect 4432 976 4456 990)(font "Arial" (font_size 8)))
 (text "CLR" (rect 2144 408 2167 422)(font "Arial" (font_size 8)))
 (text "CLR" (rect 2696 408 2719 422)(font "Arial" (font_size 8)))
-(text "CLR" (rect 3296 416 3319 430)(font "Arial" (font_size 8)))
-(text "CLR" (rect 4056 408 4079 422)(font "Arial" (font_size 8)))
-(text "CLR" (rect 4568 408 4591 422)(font "Arial" (font_size 8)))