diff --git a/TODO b/TODO
index f9bbc73..f689e1f 100644
--- a/TODO
+++ b/TODO
@@ -12,3 +12,6 @@ Atmega328							- Placed
 
 4 port opto
 TLP291-4
+
+Diferencial line driver
+SN75172
diff --git a/pcb/RevA/rste-cache.lib b/pcb/RevA/rste-cache.lib
index 7bafad9..73c3849 100644
--- a/pcb/RevA/rste-cache.lib
+++ b/pcb/RevA/rste-cache.lib
@@ -162,6 +162,59 @@ X Pin_8 8 -200 -400 150 R 50 50 1 1 P
 ENDDRAW
 ENDDEF
 #
+# Conn_02x03_Odd_Even
+#
+DEF Conn_02x03_Odd_Even J 0 40 Y N 1 F N
+F0 "J" 50 200 50 H V C CNN
+F1 "Conn_02x03_Odd_Even" 50 -200 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Connector*:*2x??x*mm*
+ Connector*:*2x???Pitch*
+ Pin_Header_Straight_2X*
+ Pin_Header_Angled_2X*
+ Socket_Strip_Straight_2X*
+ Socket_Strip_Angled_2X*
+$ENDFPLIST
+DRAW
+S -50 -95 0 -105 1 1 6 N
+S -50 5 0 -5 1 1 6 N
+S -50 105 0 95 1 1 6 N
+S -50 150 150 -150 1 1 10 f
+S 150 -95 100 -105 1 1 6 N
+S 150 5 100 -5 1 1 6 N
+S 150 105 100 95 1 1 6 N
+X Pin_1 1 -200 100 150 R 50 50 1 1 P
+X Pin_2 2 300 100 150 L 50 50 1 1 P
+X Pin_3 3 -200 0 150 R 50 50 1 1 P
+X Pin_4 4 300 0 150 L 50 50 1 1 P
+X Pin_5 5 -200 -100 150 R 50 50 1 1 P
+X Pin_6 6 300 -100 150 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Crystal
+#
+DEF Crystal Y 0 40 N N 1 F N
+F0 "Y" 0 150 50 H V C CNN
+F1 "Crystal" 0 -150 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Crystal*
+$ENDFPLIST
+DRAW
+S -45 100 45 -100 0 1 12 N
+P 2 0 1 0 -100 0 -75 0 N
+P 2 0 1 20 -75 -50 -75 50 N
+P 2 0 1 20 75 -50 75 50 N
+P 2 0 1 0 100 0 75 0 N
+X 1 1 -150 0 50 R 50 50 1 1 P
+X 2 2 150 0 50 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
 # D_Schottky
 #
 DEF D_Schottky D 0 40 N N 1 F N
@@ -413,6 +466,45 @@ X LEDY_K YK -1300 -500 175 R 50 50 1 1 P
 ENDDRAW
 ENDDEF
 #
+# SN75172
+#
+DEF SN75172 U 0 40 Y Y 4 F N
+F0 "U" -150 200 47 H V C CNN
+F1 "SN75172" 200 -200 47 H V C CNN
+F2 "" 0 -50 47 H I C CNN
+F3 "" 0 -50 47 H I C CNN
+$FPLIST
+ SOIC-20
+$ENDFPLIST
+DRAW
+T 0 40 110 20 0 0 0 "g/~g" Normal 0 C C
+C 110 -30 10 0 1 0 N
+S -200 150 200 -150 0 1 0 f
+P 2 0 1 0 0 0 -25 0 N
+P 2 0 1 0 40 30 40 80 N
+P 2 0 1 0 100 25 150 25 N
+P 2 0 1 0 100 50 100 -50 N
+P 2 0 1 0 120 -30 150 -30 N
+P 4 0 1 0 0 50 100 0 0 -50 0 50 N
+X 1A 1 -350 0 150 R 40 40 1 1 B
+X 1Y 2 350 100 150 L 40 40 1 1 B
+X 1Z 4 350 -100 150 L 40 40 1 1 B
+X G 5 -350 -100 150 R 40 40 1 1 B
+X GND 10 0 -300 150 U 40 20 1 1 B
+X VCC 20 0 300 150 D 40 20 1 1 W
+X ~G 15 -350 100 150 R 40 40 1 1 B
+X 2Z 6 350 -100 150 L 40 40 2 1 B
+X 2Y 8 350 100 150 L 40 40 2 1 B
+X 2A 9 -350 0 150 R 40 40 2 1 B
+X 3A 11 -350 0 150 R 40 40 3 1 B
+X 3Y 12 350 100 150 L 40 40 3 1 B
+X 3Z 14 350 -100 150 L 40 40 3 1 B
+X 4Z 16 350 -100 150 L 40 40 4 1 B
+X 4Y 18 350 100 150 L 40 40 4 1 B
+X 4A 19 -350 0 150 R 40 40 4 1 B
+ENDDRAW
+ENDDEF
+#
 # TLP291-4
 #
 DEF TLP291-4 U 0 40 Y Y 4 F N
diff --git a/pcb/RevA/rste.sch b/pcb/RevA/rste.sch
index 39bf3ea..9e1b695 100644
--- a/pcb/RevA/rste.sch
+++ b/pcb/RevA/rste.sch
@@ -61,249 +61,227 @@ $EndComp
 $Comp
 L ENC28J60-C/SS U?
 U 1 1 5B2A6DFE
-P 6600 3475
-F 0 "U?" H 6050 4425 50  0000 L CNN
-F 1 "ENC28J60-C/SS" H 6800 4425 50  0000 L CNN
-F 2 "SSOP-28" H 6600 3475 50  0001 C CIN
-F 3 "" H 6600 3475 50  0001 C CNN
-	1    6600 3475
+P 7000 2075
+F 0 "U?" H 6450 3025 50  0000 L CNN
+F 1 "ENC28J60-C/SS" H 7200 3025 50  0000 L CNN
+F 2 "SSOP-28" H 7000 2075 50  0001 C CIN
+F 3 "" H 7000 2075 50  0001 C CNN
+	1    7000 2075
 	1    0    0    -1  
 $EndComp
 $Comp
 L RJ45-TRANSFO J?
 U 1 1 5B2BCB23
-P 10075 3225
-F 0 "J?" H 10175 3825 50  0000 L CNN
-F 1 "RJ45-TRANSFO" H 10025 3825 50  0000 R CNN
-F 2 "" H 10075 3225 50  0001 C CNN
-F 3 "" H 10075 3225 50  0001 C CNN
-	1    10075 3225
+P 10025 1925
+F 0 "J?" H 10125 2525 50  0000 L CNN
+F 1 "RJ45-TRANSFO" H 9975 2525 50  0000 R CNN
+F 2 "" H 10025 1925 50  0001 C CNN
+F 3 "" H 10025 1925 50  0001 C CNN
+	1    10025 1925
 	1    0    0    -1  
 $EndComp
 $Comp
 L MIC4680 U?
 U 1 1 5B3217BF
-P 2525 1125
-F 0 "U?" H 2175 1475 50  0000 C CNN
-F 1 "MIC4680" H 2875 775 50  0000 C CNN
-F 2 "" H 2525 1125 60  0001 C CNN
-F 3 "" H 2525 1125 60  0001 C CNN
-	1    2525 1125
+P 2425 950
+F 0 "U?" H 2075 1300 50  0000 C CNN
+F 1 "MIC4680" H 2775 600 50  0000 C CNN
+F 2 "" H 2425 950 60  0001 C CNN
+F 3 "" H 2425 950 60  0001 C CNN
+	1    2425 950 
 	1    0    0    -1  
 $EndComp
 $Comp
 L D_Schottky D?
 U 1 1 5B321B81
-P 3150 1475
-F 0 "D?" V 3025 1550 50  0000 C CNN
-F 1 "SS26" V 3250 1575 50  0000 C CNN
-F 2 "" H 3150 1475 50  0001 C CNN
-F 3 "" H 3150 1475 50  0001 C CNN
-	1    3150 1475
+P 3050 1300
+F 0 "D?" V 2925 1375 50  0000 C CNN
+F 1 "SS26" V 3150 1400 50  0000 C CNN
+F 2 "" H 3050 1300 50  0001 C CNN
+F 3 "" H 3050 1300 50  0001 C CNN
+	1    3050 1300
 	0    1    1    0   
 $EndComp
 $Comp
 L L L?
 U 1 1 5B321C58
-P 3375 975
-F 0 "L?" V 3450 1025 50  0000 C CNN
-F 1 "68uH" V 3325 1025 50  0000 C CNN
-F 2 "" H 3375 975 50  0001 C CNN
-F 3 "" H 3375 975 50  0001 C CNN
-	1    3375 975 
+P 3275 800
+F 0 "L?" V 3350 850 50  0000 C CNN
+F 1 "68uH" V 3225 850 50  0000 C CNN
+F 2 "" H 3275 800 50  0001 C CNN
+F 3 "" H 3275 800 50  0001 C CNN
+	1    3275 800 
 	0    -1   -1   0   
 $EndComp
 $Comp
 L CP_Small C?
 U 1 1 5B321F5E
-P 1200 1125
-F 0 "C?" H 1210 1195 50  0000 L CNN
-F 1 "15pF/35V" H 1210 1045 50  0000 L CNN
-F 2 "" H 1200 1125 50  0001 C CNN
-F 3 "" H 1200 1125 50  0001 C CNN
-	1    1200 1125
+P 1100 950
+F 0 "C?" H 1110 1020 50  0000 L CNN
+F 1 "15pF/35V" H 1110 870 50  0000 L CNN
+F 2 "" H 1100 950 50  0001 C CNN
+F 3 "" H 1100 950 50  0001 C CNN
+	1    1100 950 
 	1    0    0    -1  
 $EndComp
 $Comp
 L CP_Small C?
 U 1 1 5B321FDB
-P 4100 1375
-F 0 "C?" H 4110 1445 50  0000 L CNN
-F 1 "220uF/10V" H 4110 1295 50  0000 L CNN
-F 2 "" H 4100 1375 50  0001 C CNN
-F 3 "" H 4100 1375 50  0001 C CNN
-	1    4100 1375
+P 4000 1200
+F 0 "C?" H 4010 1270 50  0000 L CNN
+F 1 "220uF/10V" H 4010 1120 50  0000 L CNN
+F 2 "" H 4000 1200 50  0001 C CNN
+F 3 "" H 4000 1200 50  0001 C CNN
+	1    4000 1200
 	1    0    0    -1  
 $EndComp
 $Comp
 L R R?
 U 1 1 5B32210E
-P 3650 1200
-F 0 "R?" H 3750 1300 50  0000 C CNN
-F 1 "3.01K" H 3825 1125 50  0000 C CNN
-F 2 "" V 3580 1200 50  0001 C CNN
-F 3 "" H 3650 1200 50  0001 C CNN
-	1    3650 1200
+P 3550 1025
+F 0 "R?" H 3650 1125 50  0000 C CNN
+F 1 "3.01K" H 3725 950 50  0000 C CNN
+F 2 "" V 3480 1025 50  0001 C CNN
+F 3 "" H 3550 1025 50  0001 C CNN
+	1    3550 1025
 	1    0    0    -1  
 $EndComp
 $Comp
 L R R?
 U 1 1 5B322173
-P 3650 1550
-F 0 "R?" H 3750 1625 50  0000 C CNN
-F 1 "1.788K" H 3825 1425 50  0000 C CNN
-F 2 "" V 3580 1550 50  0001 C CNN
-F 3 "" H 3650 1550 50  0001 C CNN
-	1    3650 1550
+P 3550 1375
+F 0 "R?" H 3650 1450 50  0000 C CNN
+F 1 "1.788K" H 3725 1250 50  0000 C CNN
+F 2 "" V 3480 1375 50  0001 C CNN
+F 3 "" H 3550 1375 50  0001 C CNN
+	1    3550 1375
 	1    0    0    -1  
 $EndComp
 $Comp
 L Conn_01x02 J?
 U 1 1 5B322696
-P 750 975
-F 0 "J?" H 750 1075 50  0000 C CNN
-F 1 "Con_2" H 750 775 50  0000 C CNN
-F 2 "" H 750 975 50  0001 C CNN
-F 3 "" H 750 975 50  0001 C CNN
-	1    750  975 
+P 650 800
+F 0 "J?" H 650 900 50  0000 C CNN
+F 1 "Con_2" H 650 600 50  0000 C CNN
+F 2 "" H 650 800 50  0001 C CNN
+F 3 "" H 650 800 50  0001 C CNN
+	1    650  800 
 	-1   0    0    -1  
 $EndComp
 $Comp
 L GND #PWR?
 U 1 1 5B322C74
-P 1200 1275
-F 0 "#PWR?" H 1200 1025 50  0001 C CNN
-F 1 "GND" H 1200 1125 50  0000 C CNN
-F 2 "" H 1200 1275 50  0001 C CNN
-F 3 "" H 1200 1275 50  0001 C CNN
-	1    1200 1275
+P 1100 1100
+F 0 "#PWR?" H 1100 850 50  0001 C CNN
+F 1 "GND" H 1100 950 50  0000 C CNN
+F 2 "" H 1100 1100 50  0001 C CNN
+F 3 "" H 1100 1100 50  0001 C CNN
+	1    1100 1100
 	1    0    0    -1  
 $EndComp
 $Comp
 L GND #PWR?
 U 1 1 5B3247B7
-P 2575 1725
-F 0 "#PWR?" H 2575 1475 50  0001 C CNN
-F 1 "GND" H 2575 1575 50  0000 C CNN
-F 2 "" H 2575 1725 50  0001 C CNN
-F 3 "" H 2575 1725 50  0001 C CNN
-	1    2575 1725
+P 2475 1550
+F 0 "#PWR?" H 2475 1300 50  0001 C CNN
+F 1 "GND" H 2475 1400 50  0000 C CNN
+F 2 "" H 2475 1550 50  0001 C CNN
+F 3 "" H 2475 1550 50  0001 C CNN
+	1    2475 1550
 	1    0    0    -1  
 $EndComp
 Wire Wire Line
-	950  975  1200 975 
+	850  800  1875 800 
 Wire Wire Line
-	1200 975  1975 975 
+	1100 850  1100 800 
+Connection ~ 1100 800 
 Wire Wire Line
-	1200 1025 1200 975 
-Connection ~ 1200 975 
+	1100 1050 1100 1100
 Wire Wire Line
-	1200 1225 1200 1250
+	850  900  925  900 
 Wire Wire Line
-	1200 1250 1200 1275
+	925  900  925  1075
 Wire Wire Line
-	950  1075 1025 1075
+	925  1075 1575 1075
+Connection ~ 1100 1075
 Wire Wire Line
-	1025 1075 1025 1250
+	1575 1075 1575 1050
 Wire Wire Line
-	1025 1250 1200 1250
+	1575 1050 1875 1050
 Wire Wire Line
-	1200 1250 1675 1250
-Connection ~ 1200 1250
+	2975 800  3125 800 
 Wire Wire Line
-	1675 1250 1675 1225
+	3050 1150 3050 800 
+Connection ~ 3050 800 
 Wire Wire Line
-	1675 1225 1975 1225
+	3550 1175 3550 1225
 Wire Wire Line
-	3075 975  3150 975 
+	2975 1050 3325 1050
 Wire Wire Line
-	3150 975  3225 975 
+	3325 1050 3325 1200
 Wire Wire Line
-	3150 1325 3150 975 
-Connection ~ 3150 975 
-Wire Wire Line
-	3650 1350 3650 1375
-Wire Wire Line
-	3650 1375 3650 1400
-Wire Wire Line
-	3075 1225 3425 1225
-Wire Wire Line
-	3425 1225 3425 1375
-Wire Wire Line
-	3425 1375 3650 1375
-Connection ~ 3650 1375
+	3325 1200 3550 1200
+Connection ~ 3550 1200
 $Comp
 L GND #PWR?
 U 1 1 5B3262AA
-P 3650 1750
-F 0 "#PWR?" H 3650 1500 50  0001 C CNN
-F 1 "GND" H 3650 1600 50  0000 C CNN
-F 2 "" H 3650 1750 50  0001 C CNN
-F 3 "" H 3650 1750 50  0001 C CNN
-	1    3650 1750
+P 3550 1575
+F 0 "#PWR?" H 3550 1325 50  0001 C CNN
+F 1 "GND" H 3550 1425 50  0000 C CNN
+F 2 "" H 3550 1575 50  0001 C CNN
+F 3 "" H 3550 1575 50  0001 C CNN
+	1    3550 1575
 	1    0    0    -1  
 $EndComp
 $Comp
 L GND #PWR?
 U 1 1 5B326416
-P 4100 1525
-F 0 "#PWR?" H 4100 1275 50  0001 C CNN
-F 1 "GND" H 4100 1375 50  0000 C CNN
-F 2 "" H 4100 1525 50  0001 C CNN
-F 3 "" H 4100 1525 50  0001 C CNN
-	1    4100 1525
+P 4000 1350
+F 0 "#PWR?" H 4000 1100 50  0001 C CNN
+F 1 "GND" H 4000 1200 50  0000 C CNN
+F 2 "" H 4000 1350 50  0001 C CNN
+F 3 "" H 4000 1350 50  0001 C CNN
+	1    4000 1350
 	1    0    0    -1  
 $EndComp
 Wire Wire Line
-	3150 1675 3150 1625
+	3050 1500 3050 1450
 Wire Wire Line
-	2375 1675 2475 1675
+	2275 1500 3050 1500
 Wire Wire Line
-	2475 1675 2575 1675
+	2275 1500 2275 1400
 Wire Wire Line
-	2575 1675 2675 1675
+	2475 1400 2475 1550
+Connection ~ 2475 1500
 Wire Wire Line
-	2675 1675 3150 1675
+	2375 1400 2375 1500
+Connection ~ 2375 1500
 Wire Wire Line
-	2375 1675 2375 1575
+	2575 1400 2575 1500
+Connection ~ 2575 1500
 Wire Wire Line
-	2575 1575 2575 1675
+	3550 1525 3550 1575
 Wire Wire Line
-	2575 1675 2575 1725
-Connection ~ 2575 1675
-Wire Wire Line
-	2475 1575 2475 1675
-Connection ~ 2475 1675
-Wire Wire Line
-	2675 1575 2675 1675
-Connection ~ 2675 1675
-Wire Wire Line
-	3650 1700 3650 1750
-Wire Wire Line
-	4100 1475 4100 1525
+	4000 1300 4000 1350
 $Comp
 L +5V #PWR?
 U 1 1 5B326D69
-P 4100 900
-F 0 "#PWR?" H 4100 750 50  0001 C CNN
-F 1 "+5V" H 4100 1040 50  0000 C CNN
-F 2 "" H 4100 900 50  0001 C CNN
-F 3 "" H 4100 900 50  0001 C CNN
-	1    4100 900 
+P 4000 725
+F 0 "#PWR?" H 4000 575 50  0001 C CNN
+F 1 "+5V" H 4000 865 50  0000 C CNN
+F 2 "" H 4000 725 50  0001 C CNN
+F 3 "" H 4000 725 50  0001 C CNN
+	1    4000 725 
 	1    0    0    -1  
 $EndComp
 Wire Wire Line
-	4100 900  4100 975 
+	4000 725  4000 1100
 Wire Wire Line
-	4100 975  4100 1275
+	3425 800  4000 800 
+Connection ~ 4000 800 
 Wire Wire Line
-	3525 975  3650 975 
-Wire Wire Line
-	3650 975  4100 975 
-Connection ~ 4100 975 
-Wire Wire Line
-	3650 1050 3650 975 
-Connection ~ 3650 975 
+	3550 875  3550 800 
+Connection ~ 3550 800 
 $Comp
 L GND #PWR?
 U 1 1 5B329C0C
@@ -318,11 +296,7 @@ $EndComp
 Wire Wire Line
 	1625 4475 1550 4475
 Wire Wire Line
-	1550 4475 1550 4575
-Wire Wire Line
-	1550 4575 1550 4675
-Wire Wire Line
-	1550 4675 1550 4750
+	1550 4475 1550 4750
 Wire Wire Line
 	1550 4575 1625 4575
 Connection ~ 1550 4575
@@ -380,17 +354,11 @@ F 3 "" H 1500 2250 50  0001 C CNN
 	1    0    0    -1  
 $EndComp
 Wire Wire Line
-	1500 2250 1500 2375
-Wire Wire Line
-	1500 2375 1500 2475
-Wire Wire Line
-	1500 2475 1500 2675
+	1500 2250 1500 2675
 Wire Wire Line
 	1500 2675 1625 2675
 Wire Wire Line
-	1375 2375 1500 2375
-Wire Wire Line
-	1500 2375 1625 2375
+	1375 2375 1625 2375
 Connection ~ 1500 2375
 Wire Wire Line
 	1625 2475 1500 2475
@@ -468,13 +436,7 @@ F 3 "" H 3025 7475 50  0001 C CNN
 	1    0    0    -1  
 $EndComp
 Wire Wire Line
-	3025 5650 3025 6225
-Wire Wire Line
-	3025 6225 3025 6800
-Wire Wire Line
-	3025 6800 3025 7375
-Wire Wire Line
-	3025 7375 3025 7475
+	3025 5650 3025 7475
 Wire Wire Line
 	3025 5650 2900 5650
 Wire Wire Line
@@ -487,37 +449,29 @@ Wire Wire Line
 	2925 7375 3025 7375
 Connection ~ 3025 7375
 Wire Wire Line
-	3525 4275 3600 4275
+	3525 4375 3600 4375
 Wire Wire Line
-	3600 4275 3600 5450
+	3600 4375 3600 5450
 Wire Wire Line
-	3600 5450 3325 5450
+	3600 5450 2900 5450
 Wire Wire Line
-	3325 5450 2900 5450
+	3525 4275 3700 4275
 Wire Wire Line
-	3525 4175 3700 4175
+	3700 4275 3700 6025
 Wire Wire Line
-	3700 4175 3700 6025
+	3700 6025 2900 6025
 Wire Wire Line
-	3700 6025 3325 6025
+	3525 4175 3800 4175
 Wire Wire Line
-	3325 6025 2900 6025
+	3800 4175 3800 6600
 Wire Wire Line
-	3525 4075 3800 4075
-Wire Wire Line
-	3800 4075 3800 6600
-Wire Wire Line
-	3800 6600 3325 6600
-Wire Wire Line
-	3325 6600 2925 6600
+	3800 6600 2925 6600
 Wire Wire Line
 	3525 3975 3900 3975
 Wire Wire Line
 	3900 3975 3900 7175
 Wire Wire Line
-	3900 7175 3325 7175
-Wire Wire Line
-	3325 7175 2925 7175
+	3900 7175 2925 7175
 $Comp
 L R R?
 U 1 1 5B334A61
@@ -640,75 +594,75 @@ $EndComp
 $Comp
 L R R?
 U 1 1 5B32B4B7
-P 1800 5450
-F 0 "R?" V 1700 5400 50  0000 C CNN
-F 1 "1K" V 1850 5625 50  0000 C CNN
-F 2 "" V 1730 5450 50  0001 C CNN
-F 3 "" H 1800 5450 50  0001 C CNN
-	1    1800 5450
+P 1900 5450
+F 0 "R?" V 1800 5400 50  0000 C CNN
+F 1 "1K" V 1950 5625 50  0000 C CNN
+F 2 "" V 1830 5450 50  0001 C CNN
+F 3 "" H 1900 5450 50  0001 C CNN
+	1    1900 5450
 	0    1    1    0   
 $EndComp
 $Comp
 L R R?
 U 1 1 5B32B672
-P 1800 6025
-F 0 "R?" V 1700 5975 50  0000 C CNN
-F 1 "1K" V 1850 6200 50  0000 C CNN
-F 2 "" V 1730 6025 50  0001 C CNN
-F 3 "" H 1800 6025 50  0001 C CNN
-	1    1800 6025
+P 1900 6025
+F 0 "R?" V 1800 5975 50  0000 C CNN
+F 1 "1K" V 1950 6200 50  0000 C CNN
+F 2 "" V 1830 6025 50  0001 C CNN
+F 3 "" H 1900 6025 50  0001 C CNN
+	1    1900 6025
 	0    1    1    0   
 $EndComp
 $Comp
 L R R?
 U 1 1 5B32C31C
-P 1800 7175
-F 0 "R?" V 1700 7125 50  0000 C CNN
-F 1 "1K" V 1850 7350 50  0000 C CNN
-F 2 "" V 1730 7175 50  0001 C CNN
-F 3 "" H 1800 7175 50  0001 C CNN
-	1    1800 7175
+P 1900 7175
+F 0 "R?" V 1800 7125 50  0000 C CNN
+F 1 "1K" V 1950 7350 50  0000 C CNN
+F 2 "" V 1830 7175 50  0001 C CNN
+F 3 "" H 1900 7175 50  0001 C CNN
+	1    1900 7175
 	0    1    1    0   
 $EndComp
 $Comp
 L R R?
 U 1 1 5B32C310
-P 1800 6600
-F 0 "R?" V 1700 6550 50  0000 C CNN
-F 1 "1K" V 1850 6775 50  0000 C CNN
-F 2 "" V 1730 6600 50  0001 C CNN
-F 3 "" H 1800 6600 50  0001 C CNN
-	1    1800 6600
+P 1900 6600
+F 0 "R?" V 1800 6550 50  0000 C CNN
+F 1 "1K" V 1950 6775 50  0000 C CNN
+F 2 "" V 1830 6600 50  0001 C CNN
+F 3 "" H 1900 6600 50  0001 C CNN
+	1    1900 6600
 	0    1    1    0   
 $EndComp
 Wire Wire Line
-	1050 5450 1650 5450
+	1050 5450 1750 5450
 Wire Wire Line
-	1950 5450 2300 5450
+	2050 5450 2300 5450
 Wire Wire Line
 	1050 5650 1600 5650
 Wire Wire Line
 	1600 5650 1600 6025
 Wire Wire Line
-	1600 6025 1650 6025
+	1600 6025 1750 6025
 Wire Wire Line
-	1950 6025 2300 6025
+	2050 6025 2300 6025
 Wire Wire Line
 	1050 5850 1450 5850
 Wire Wire Line
 	1450 5850 1450 6600
 Wire Wire Line
-	1450 6600 1650 6600
+	1450 6600 1750 6600
 Wire Wire Line
 	1050 6050 1300 6050
 Wire Wire Line
 	1300 6050 1300 7175
 Wire Wire Line
-	1300 7175 1650 7175
+	1300 7175 1750 7175
 Wire Wire Line
-	1950 6600 2325 6600
+	2050 6600 2325 6600
 Wire Wire Line
-	1950 7175 2325 7175
+	2050 7175 2325 7175
 Wire Wire Line
 	1050 5550 1675 5550
 Wire Wire Line
@@ -733,4 +687,198 @@ Wire Wire Line
 	1225 6150 1225 7375
 Wire Wire Line
 	1225 7375 2325 7375
+$Comp
+L Crystal Y?
+U 1 1 5B362D19
+P 4100 3025
+F 0 "Y?" V 3950 2950 50  0000 C CNN
+F 1 "16Mhz" V 4350 3025 50  0000 C CNN
+F 2 "" H 4100 3025 50  0001 C CNN
+F 3 "" H 4100 3025 50  0001 C CNN
+	1    4100 3025
+	0    1    1    0   
+$EndComp
+$Comp
+L C C?
+U 1 1 5B362E27
+P 4425 3225
+F 0 "C?" V 4300 3200 50  0000 L CNN
+F 1 "22pF" V 4550 3150 50  0000 L CNN
+F 2 "" H 4463 3075 50  0001 C CNN
+F 3 "" H 4425 3225 50  0001 C CNN
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+L C C?
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+Wire Wire Line
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+Wire Wire Line
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+L GND #PWR?
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+$EndComp
+Wire Wire Line
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+$Comp
+L +5V #PWR?
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+L SN75172 U?
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+L SN75172 U?
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+$Comp
+L SN75172 U?
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+$EndComp
+$Comp
+L SN75172 U?
+U 4 1 5B36A10E
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+$EndComp
 $EndSCHEMATC