diff --git a/examples/digital/digital_devices/74f524-cp.stim b/examples/digital/digital_devices/74f524-cp.stim
index 1042719a6..6ffbe10aa 100644
--- a/examples/digital/digital_devices/74f524-cp.stim
+++ b/examples/digital/digital_devices/74f524-cp.stim
@@ -7,5 +7,27 @@
 150ns   0s
 600ns   1s
 650ns   0s
-1.10us  1s
-1.15us  0s
+1100ns  1s
+1150ns  0s
+* shift sequence
+1200ns  1s
+1250ns  0s
+1300ns  1s
+1350ns  0s
+1400ns  1s
+1450ns  0s
+1500ns  1s
+1550ns  0s
+1600ns  1s
+1650ns  0s
+1700ns  1s
+1750ns  0s
+1800ns  1s
+1850ns  0s
+1900ns  1s
+1950ns  0s
+*
+2500ns  1s
+2550ns  0s
+2600ns  1s
+2650ns  0s
diff --git a/examples/digital/digital_devices/74f524-csi.stim b/examples/digital/digital_devices/74f524-csi.stim
index aee0fa048..d381ef2c1 100644
--- a/examples/digital/digital_devices/74f524-csi.stim
+++ b/examples/digital/digital_devices/74f524-csi.stim
@@ -2,8 +2,21 @@
 * i     s
 * m     i
 * e
+* csi is used with seb as status truth table entries in hold mode
 10ns    1s
 220ns   0s
 270ns   1s
 620ns   0s
 700ns   1s
+* shift - serial load data
+1170ns  0s
+1270ns  0s
+1370ns  1s
+1470ns  1s
+1570ns  0s
+1670ns  1s
+1770ns  0s
+1870ns  1s
+*
+2040ns  0s
+2240ns  1s
diff --git a/examples/digital/digital_devices/74f524-io.stim b/examples/digital/digital_devices/74f524-io.stim
index 286808af1..d444c620d 100644
--- a/examples/digital/digital_devices/74f524-io.stim
+++ b/examples/digital/digital_devices/74f524-io.stim
@@ -6,4 +6,8 @@
 250ns   0s   0s   1s   0s   0s   1s   1s   0s
 350ns   1s   0s   0s   0s   0s   0s   1s   1s
 450ns   1s   1s   0s   0s   0s   1s   1s   0s
+* float ios before read mode
 850ns   Uz   Uz   Uz   Uz   Uz   Uz   Uz   Uz
+1340ns  0s   0s   0s   0s   0s   0s   1s   1s
+* float ios before read mode
+2300ns  Uz   Uz   Uz   Uz   Uz   Uz   Uz   Uz
diff --git a/examples/digital/digital_devices/74f524-s0s1.stim b/examples/digital/digital_devices/74f524-s0s1.stim
index 228fe9a09..7b2f17f97 100644
--- a/examples/digital/digital_devices/74f524-s0s1.stim
+++ b/examples/digital/digital_devices/74f524-s0s1.stim
@@ -2,6 +2,15 @@
 * i     0    1
 * m
 * e
+* load
 15ns    1s   1s
+* hold
 215ns   0s   0s
-1us     0s   1s
+* read
+1000ns  0s   1s
+* shift
+1160ns  1s   0s
+* hold
+2000ns  0s   0s
+* read
+2400ns  0s   1s
diff --git a/examples/digital/digital_devices/74f524-sem.stim b/examples/digital/digital_devices/74f524-sem.stim
index e944d3c7d..6778d6535 100644
--- a/examples/digital/digital_devices/74f524-sem.stim
+++ b/examples/digital/digital_devices/74f524-sem.stim
@@ -2,9 +2,16 @@
 * i     e
 * m     b
 * e
+* seb and csi are status truth table entries in hold mode
+* m = 0 magnitude compare
+* m = 1 twos-complement compare
 15ns    1s   0s
 215ns   0s   0s
 300ns   0s   1s
 640ns   1s   1s
 800ns   0s   1s
 900ns   0s   0s
+1160ns  1s   0s
+2000ns  0s   0s
+2100ns  0s   1s
+2200ns  0s   0s
diff --git a/examples/digital/digital_devices/74f524.cir b/examples/digital/digital_devices/74f524.cir
index 90f072ad5..5e3ba3de1 100644
--- a/examples/digital/digital_devices/74f524.cir
+++ b/examples/digital/digital_devices/74f524.cir
@@ -196,7 +196,7 @@ a4 [i_s0 i_s1] in_vec4
 a5 [csi] in_vec5
 .model in_vec5 d_source(input_file="74f524-csi.stim")
 
-.tran 1ns 2us
+.tran 1ns 3us
 .control
 run
 listing