diff --git a/machine_alpha/MDR_8b.bdf b/machine_alpha/MDR_8b.bdf
index ba85e26..d7e14af 100644
--- a/machine_alpha/MDR_8b.bdf
+++ b/machine_alpha/MDR_8b.bdf
@@ -166,9 +166,9 @@ applicable agreement for further details.
 )
 (pin
 	(input)
-	(rect -80 488 88 504)
+	(rect -80 184 88 200)
 	(text "INPUT" (rect 133 0 161 10)(font "Arial" (font_size 6)))
-	(text "BUS_EN" (rect 5 0 48 12)(font "Arial" ))
+	(text "CP" (rect 5 0 20 12)(font "Arial" ))
 	(pt 168 8)
 	(drawing
 		(line (pt 92 12)(pt 117 12)(line_width 1))
@@ -182,9 +182,9 @@ applicable agreement for further details.
 )
 (pin
 	(input)
-	(rect -80 184 88 200)
+	(rect -80 488 88 504)
 	(text "INPUT" (rect 133 0 161 10)(font "Arial" (font_size 6)))
-	(text "CP" (rect 5 0 20 12)(font "Arial" ))
+	(text "1BUS2MDR" (rect 5 0 64 12)(font "Arial" ))
 	(pt 168 8)
 	(drawing
 		(line (pt 92 12)(pt 117 12)(line_width 1))
diff --git a/machine_alpha/MDR_8b.bsf b/machine_alpha/MDR_8b.bsf
index 6b69fc1..53c17f3 100644
--- a/machine_alpha/MDR_8b.bsf
+++ b/machine_alpha/MDR_8b.bsf
@@ -96,8 +96,8 @@ applicable agreement for further details.
 	(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)))
+		(text "1BUS2MDR" (rect 0 0 64 14)(font "Arial" (font_size 8)))
+		(text "1BUS2MDR" (rect 21 203 85 217)(font "Arial" (font_size 8)))
 		(line (pt 0 208)(pt 16 208)(line_width 1))
 	)
 	(port
diff --git a/machine_alpha/machine_alpha.bdf b/machine_alpha/machine_alpha.bdf
index bbe069f..0b598d2 100644
--- a/machine_alpha/machine_alpha.bdf
+++ b/machine_alpha/machine_alpha.bdf
@@ -1536,203 +1536,6 @@ applicable agreement for further details.
 		(rectangle (rect 16 16 160 304)(line_width 1))
 	)
 )
-(symbol
-	(rect 3160 848 3336 1088)
-	(text "MDR_8b" (rect 5 0 52 14)(font "Arial" (font_size 8)))
-	(text "inst2" (rect 8 224 31 236)(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
-		(pt 48 0)
-		(output)
-		(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))
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-	)
-	(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))
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-		(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))
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-	(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))
-	)
-)
 (symbol
 	(rect 3016 1248 3112 1472)
 	(text "register_8b" (rect 5 0 69 14)(font "Arial" (font_size 8)))
@@ -3170,6 +2973,203 @@ applicable agreement for further details.
 		(circle (rect 31 12 39 20)(line_width 1))
 	)
 )
+(symbol
+	(rect 3160 848 3336 1088)
+	(text "MDR_8b" (rect 5 0 52 14)(font "Arial" (font_size 8)))
+	(text "inst2" (rect 8 224 31 236)(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 "1BUS2MDR" (rect 0 0 64 14)(font "Arial" (font_size 8)))
+		(text "1BUS2MDR" (rect 21 203 85 217)(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
+		(pt 48 0)
+		(output)
+		(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))
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+	(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))
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+	(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)))
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+		(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))
+	)
+)
 (connector
 	(pt 2952 1408)
 	(pt 3016 1408)