diff --git a/AdderSubtractor_Markou.circ b/AdderSubtractor_Markou.circ
new file mode 100644
index 0000000..03c0ee7
--- /dev/null
+++ b/AdderSubtractor_Markou.circ
@@ -0,0 +1,392 @@
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diff --git a/OneBitAdder_Markou.circ b/OneBitAdder_Markou.circ
new file mode 100644
index 0000000..49884c5
--- /dev/null
+++ b/OneBitAdder_Markou.circ
@@ -0,0 +1,241 @@
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+This file is intended to be loaded by Logisim (http://www.cburch.com/logisim/).
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diff --git a/lab13/Registers.circ b/lab13/Registers.circ
index db7be63..bd1f732 100644
--- a/lab13/Registers.circ
+++ b/lab13/Registers.circ
@@ -2,11 +2,30 @@
This file is intended to be loaded by Logisim (http://www.cburch.com/logisim/).
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@@ -16,7 +35,7 @@
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@@ -51,11 +70,39 @@
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diff --git a/lab15/ALU-2_Markou.circ b/lab15/ALU-2_Markou.circ
new file mode 100644
index 0000000..adc2dda
--- /dev/null
+++ b/lab15/ALU-2_Markou.circ
@@ -0,0 +1,178 @@
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diff --git a/lab15/ALU-Test_CalebFontenot.circ b/lab15/ALU-Test_CalebFontenot.circ
new file mode 100644
index 0000000..f62c732
--- /dev/null
+++ b/lab15/ALU-Test_CalebFontenot.circ
@@ -0,0 +1,109 @@
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diff --git a/lab15/ALU_CalebFontenot.circ b/lab15/ALU_CalebFontenot.circ
new file mode 100644
index 0000000..22f29ef
--- /dev/null
+++ b/lab15/ALU_CalebFontenot.circ
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diff --git a/lab15/labALU-1.pdf b/lab15/labALU-1.pdf
new file mode 100644
index 0000000..1d67dce
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diff --git a/lab15/oneANDfive.png b/lab15/oneANDfive.png
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diff --git a/lab15/oneORfive.png b/lab15/oneORfive.png
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diff --git a/lab16/1Plus4.png b/lab16/1Plus4.png
new file mode 100644
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diff --git a/lab16/ALU_CalebFontenot.circ b/lab16/ALU_CalebFontenot.circ
new file mode 100644
index 0000000..7624e8c
--- /dev/null
+++ b/lab16/ALU_CalebFontenot.circ
@@ -0,0 +1,212 @@
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diff --git a/lab16/labRegistersChip-1.pdf b/lab16/labRegistersChip-1.pdf
new file mode 100644
index 0000000..6a7a6f3
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diff --git a/lab17/ProgramCounter.circ b/lab17/ProgramCounter.circ
new file mode 100644
index 0000000..7b8ae08
--- /dev/null
+++ b/lab17/ProgramCounter.circ
@@ -0,0 +1,124 @@
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diff --git a/lab17/programAdder.png b/lab17/programAdder.png
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