diff --git a/machine_alpha/machine_alpha.bdf b/machine_alpha/machine_alpha.bdf
index e2729dd..b1976b5 100644
--- a/machine_alpha/machine_alpha.bdf
+++ b/machine_alpha/machine_alpha.bdf
@@ -543,154 +543,6 @@ applicable agreement for further details.
 	)
 	(text "VCC" (rect 4 7 24 17)(font "Arial" (font_size 6)))
 )
-(symbol
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-	(text "register_4x" (rect 5 0 69 14)(font "Arial" (font_size 8)))
-	(text "general_registers" (rect 8 240 91 252)(font "Arial" ))
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-		(input)
-		(text "CLR" (rect 0 0 23 14)(font "Arial" (font_size 8)))
-		(text "CLR" (rect 21 27 44 41)(font "Arial" (font_size 8)))
-		(line (pt 0 32)(pt 16 32)(line_width 1))
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-		(text "EN1" (rect 21 43 43 57)(font "Arial" (font_size 8)))
-		(line (pt 0 48)(pt 16 48)(line_width 1))
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-		(text "EN0" (rect 21 59 43 73)(font "Arial" (font_size 8)))
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@@ -2531,37 +2383,237 @@ applicable agreement for further details.
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+		(text "OUT_L_EN1" (rect 21 59 89 73)(font "Arial" (font_size 8)))
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-	(pt 2000 1520)
-)
-(connector
-	(pt 2008 1040)
-	(pt 2008 1536)
-)
-(connector
-	(pt 2016 1056)
-	(pt 2016 1552)
-)
-(connector
-	(pt 2024 1072)
-	(pt 2024 1568)
-)
-(connector
-	(pt 2032 1088)
-	(pt 2032 1584)
-)
-(connector
-	(pt 2040 1104)
-	(pt 2040 1600)
-)
-(connector
-	(pt 1384 992)
-	(pt 1984 992)
-)
-(connector
-	(pt 1400 1008)
-	(pt 1992 1008)
-)
-(connector
-	(pt 1416 1024)
-	(pt 2000 1024)
-)
-(connector
-	(pt 1432 1040)
-	(pt 2008 1040)
-)
-(connector
-	(pt 1448 1056)
-	(pt 2016 1056)
-)
-(connector
-	(pt 1464 1072)
-	(pt 2024 1072)
-)
-(connector
-	(pt 1480 1088)
-	(pt 2032 1088)
-)
-(connector
-	(pt 1496 1104)
-	(pt 2040 1104)
-)
 (connector
 	(pt 2696 1432)
 	(pt 2496 1432)
@@ -4066,66 +3879,34 @@ applicable agreement for further details.
 	(pt 2496 992)
 	(pt 2496 1432)
 )
-(connector
-	(pt 1984 992)
-	(pt 2496 992)
-)
 (connector
 	(pt 2504 1008)
 	(pt 2504 1448)
 )
-(connector
-	(pt 1992 1008)
-	(pt 2504 1008)
-)
 (connector
 	(pt 2512 1024)
 	(pt 2512 1464)
 )
-(connector
-	(pt 2000 1024)
-	(pt 2512 1024)
-)
 (connector
 	(pt 2520 1040)
 	(pt 2520 1480)
 )
-(connector
-	(pt 2008 1040)
-	(pt 2520 1040)
-)
 (connector
 	(pt 2528 1056)
 	(pt 2528 1496)
 )
-(connector
-	(pt 2016 1056)
-	(pt 2528 1056)
-)
 (connector
 	(pt 2536 1072)
 	(pt 2536 1512)
 )
-(connector
-	(pt 2024 1072)
-	(pt 2536 1072)
-)
 (connector
 	(pt 2544 1088)
 	(pt 2544 1528)
 )
-(connector
-	(pt 2032 1088)
-	(pt 2544 1088)
-)
 (connector
 	(pt 2552 1104)
 	(pt 2552 1544)
 )
-(connector
-	(pt 2040 1104)
-	(pt 2552 1104)
-)
 (connector
 	(pt 2496 992)
 	(pt 3048 992)
@@ -4470,6 +4251,309 @@ applicable agreement for further details.
 	(pt 912 1024)
 	(pt 912 1080)
 )
+(connector
+	(pt 2064 1440)
+	(pt 2072 1440)
+	(color 0 0 0)
+)
+(connector
+	(pt 2064 120)
+	(pt 2064 424)
+	(color 0 0 0)
+)
+(connector
+	(pt 2064 424)
+	(pt 2064 1440)
+	(color 0 0 0)
+)
+(connector
+	(pt 560 2104)
+	(pt 2304 2104)
+)
+(connector
+	(pt 544 2088)
+	(pt 2312 2088)
+)
+(connector
+	(pt 528 2072)
+	(pt 2320 2072)
+)
+(connector
+	(pt 512 2056)
+	(pt 2328 2056)
+)
+(connector
+	(pt 496 2040)
+	(pt 2336 2040)
+)
+(connector
+	(pt 480 2024)
+	(pt 2344 2024)
+)
+(connector
+	(pt 464 2008)
+	(pt 2352 2008)
+)
+(connector
+	(pt 448 1992)
+	(pt 2360 1992)
+)
+(connector
+	(pt 2384 1936)
+	(pt 2384 1552)
+)
+(connector
+	(pt 2392 1920)
+	(pt 2392 1536)
+)
+(connector
+	(pt 2400 1904)
+	(pt 2400 1520)
+)
+(connector
+	(pt 2408 1888)
+	(pt 2408 1504)
+)
+(connector
+	(pt 2416 1872)
+	(pt 2416 1488)
+)
+(connector
+	(pt 2424 1856)
+	(pt 2424 1472)
+)
+(connector
+	(pt 2432 1840)
+	(pt 2432 1456)
+)
+(connector
+	(pt 2440 1824)
+	(pt 2440 1440)
+)
+(connector
+	(pt 2440 1440)
+	(pt 2248 1440)
+)
+(connector
+	(pt 2432 1456)
+	(pt 2248 1456)
+)
+(connector
+	(pt 2424 1472)
+	(pt 2248 1472)
+)
+(connector
+	(pt 2416 1488)
+	(pt 2248 1488)
+)
+(connector
+	(pt 2408 1504)
+	(pt 2248 1504)
+)
+(connector
+	(pt 2400 1520)
+	(pt 2248 1520)
+)
+(connector
+	(pt 2392 1536)
+	(pt 2248 1536)
+)
+(connector
+	(pt 2384 1552)
+	(pt 2248 1552)
+)
+(connector
+	(pt 2304 1680)
+	(pt 2248 1680)
+)
+(connector
+	(pt 2312 1664)
+	(pt 2248 1664)
+)
+(connector
+	(pt 2320 1648)
+	(pt 2248 1648)
+)
+(connector
+	(pt 2328 1632)
+	(pt 2248 1632)
+)
+(connector
+	(pt 2336 1616)
+	(pt 2248 1616)
+)
+(connector
+	(pt 2344 1600)
+	(pt 2248 1600)
+)
+(connector
+	(pt 2352 1584)
+	(pt 2248 1584)
+)
+(connector
+	(pt 2360 1568)
+	(pt 2248 1568)
+)
+(connector
+	(pt 2304 2104)
+	(pt 2304 1680)
+)
+(connector
+	(pt 2312 2088)
+	(pt 2312 1664)
+)
+(connector
+	(pt 2320 2072)
+	(pt 2320 1648)
+)
+(connector
+	(pt 2328 2056)
+	(pt 2328 1632)
+)
+(connector
+	(pt 2336 2040)
+	(pt 2336 1616)
+)
+(connector
+	(pt 2344 2024)
+	(pt 2344 1600)
+)
+(connector
+	(pt 2352 2008)
+	(pt 2352 1584)
+)
+(connector
+	(pt 2360 1992)
+	(pt 2360 1568)
+)
+(connector
+	(pt 1384 992)
+	(pt 1984 992)
+)
+(connector
+	(pt 1984 992)
+	(pt 2496 992)
+)
+(connector
+	(pt 1400 1008)
+	(pt 1992 1008)
+)
+(connector
+	(pt 1992 1008)
+	(pt 2504 1008)
+)
+(connector
+	(pt 1416 1024)
+	(pt 2000 1024)
+)
+(connector
+	(pt 2000 1024)
+	(pt 2512 1024)
+)
+(connector
+	(pt 1432 1040)
+	(pt 2008 1040)
+)
+(connector
+	(pt 2008 1040)
+	(pt 2520 1040)
+)
+(connector
+	(pt 1448 1056)
+	(pt 2016 1056)
+)
+(connector
+	(pt 2016 1056)
+	(pt 2528 1056)
+)
+(connector
+	(pt 1464 1072)
+	(pt 2024 1072)
+)
+(connector
+	(pt 2024 1072)
+	(pt 2536 1072)
+)
+(connector
+	(pt 1480 1088)
+	(pt 2032 1088)
+)
+(connector
+	(pt 2032 1088)
+	(pt 2544 1088)
+)
+(connector
+	(pt 1496 1104)
+	(pt 2040 1104)
+)
+(connector
+	(pt 2040 1104)
+	(pt 2552 1104)
+)
+(connector
+	(pt 1984 1520)
+	(pt 2072 1520)
+)
+(connector
+	(pt 1984 992)
+	(pt 1984 1520)
+)
+(connector
+	(pt 1992 1536)
+	(pt 2072 1536)
+)
+(connector
+	(pt 1992 1008)
+	(pt 1992 1536)
+)
+(connector
+	(pt 2000 1552)
+	(pt 2072 1552)
+)
+(connector
+	(pt 2000 1024)
+	(pt 2000 1552)
+)
+(connector
+	(pt 2008 1568)
+	(pt 2072 1568)
+)
+(connector
+	(pt 2008 1040)
+	(pt 2008 1568)
+)
+(connector
+	(pt 2016 1584)
+	(pt 2072 1584)
+)
+(connector
+	(pt 2016 1056)
+	(pt 2016 1584)
+)
+(connector
+	(pt 2024 1600)
+	(pt 2072 1600)
+)
+(connector
+	(pt 2024 1072)
+	(pt 2024 1600)
+)
+(connector
+	(pt 2032 1616)
+	(pt 2072 1616)
+)
+(connector
+	(pt 2032 1088)
+	(pt 2032 1616)
+)
+(connector
+	(pt 2040 1632)
+	(pt 2072 1632)
+)
+(connector
+	(pt 2040 1104)
+	(pt 2040 1632)
+)
 (junction (pt 3048 992))
 (junction (pt 3056 1008))
 (junction (pt 3064 1024))