diff --git a/pat80-computer/hardware/schematics/pat80/pat80.sch b/pat80-computer/hardware/schematics/pat80/pat80.sch
index a152c2c..2d2db5a 100644
--- a/pat80-computer/hardware/schematics/pat80/pat80.sch
+++ b/pat80-computer/hardware/schematics/pat80/pat80.sch
@@ -2244,4 +2244,6 @@ Wire Bus Line
 	14150 1700 14150 7600
 Wire Bus Line
 	1550 1150 1550 4000
+Text Notes 950  4450 0    50   ~ 0
+IOBUS connector is inserted into a passive backplane\nthat can be seen in the Backplane schematics.
 $EndSCHEMATC
diff --git a/pat80-computer/hardware/schematics/pat80/pat80.sch-bak b/pat80-computer/hardware/schematics/pat80/pat80.sch-bak
index cd0e55c..a152c2c 100644
--- a/pat80-computer/hardware/schematics/pat80/pat80.sch-bak
+++ b/pat80-computer/hardware/schematics/pat80/pat80.sch-bak
@@ -799,7 +799,7 @@ U 1 1 6058BCE7
 P 2500 5650
 F 0 "Y1" V 2454 5781 50  0000 L CNN
 F 1 "4Mhz" V 2545 5781 50  0000 L CNN
-F 2 "" H 2500 5650 50  0001 C CNN
+F 2 "Crystal:Crystal_HC18-U_Vertical" H 2500 5650 50  0001 C CNN
 F 3 "~" H 2500 5650 50  0001 C CNN
 	1    2500 5650
 	0    1    1    0   
@@ -1312,7 +1312,7 @@ U 1 1 60832D85
 P 12450 2800
 F 0 "U20" H 12450 3581 50  0000 C CNN
 F 1 "74HC138" H 12450 3490 50  0000 C CNN
-F 2 "" H 12450 2800 50  0001 C CNN
+F 2 "Package_DIP:DIP-16_W7.62mm_Socket_LongPads" H 12450 2800 50  0001 C CNN
 F 3 "http://www.ti.com/lit/gpn/sn74LS138" H 12450 2800 50  0001 C CNN
 	1    12450 2800
 	1    0    0    -1  
@@ -1489,7 +1489,7 @@ U 1 1 6057058E
 P 9850 4350
 F 0 "U21" H 9850 5331 50  0000 C CNN
 F 1 "74HC244" H 9850 5240 50  0000 C CNN
-F 2 "" H 9850 4350 50  0001 C CNN
+F 2 "Package_DIP:DIP-20_W7.62mm_Socket_LongPads" H 9850 4350 50  0001 C CNN
 F 3 "http://www.nxp.com/documents/data_sheet/74HC_HCT244.pdf" H 9850 4350 50  0001 C CNN
 	1    9850 4350
 	1    0    0    -1  
@@ -1753,7 +1753,7 @@ U 1 1 608489B5
 P 12350 6550
 F 0 "U22" H 12350 7531 50  0000 C CNN
 F 1 "74HC245" H 12350 7440 50  0000 C CNN
-F 2 "" H 12350 6550 50  0001 C CNN
+F 2 "Package_DIP:DIP-20_W7.62mm_Socket_LongPads" H 12350 6550 50  0001 C CNN
 F 3 "http://www.ti.com/lit/gpn/sn74HC245" H 12350 6550 50  0001 C CNN
 	1    12350 6550
 	-1   0    0    -1