diff --git a/content/notes/204-exam.md b/content/notes/204-exam.md
index 71fd207d9..85e4ca839 100644
--- a/content/notes/204-exam.md
+++ b/content/notes/204-exam.md
@@ -5,6 +5,29 @@ tags:
 ---
 
 Will be examined
+
+hardware
+- what is a computer
+- combinatorial logic
+- sequetial
+	- sr latch
+	- D, t, jk flip flop, state transition diagrama
+- archtecture
+	- memory, busses, alu, control unit, registers, instructions
+
+assembly
+- machine code
+- registers, stack, instruction set
+- syntac, routines, iteration, comparisons, local vars, parameters
+
+C
+- why C, syntac
+- memory, variables, call by value/address, pointer arithmetic
+- arrays, malloc, free, sentinels, length of array
+- struct and union, declaration, initialization, shallow/deep copy, queues
+- pointers to routines, ADTs, contructors, destructors
+
+Operating systems
 - process scheduling algorithms (smiliar to labs)
 - memory management and replacement algorithms FIFO LRU
 - Layout of process. mapping details
@@ -24,4 +47,25 @@ Will be examined
 	- system call - interaction betwen user and kernel space
 	- threads
 		- special process
-		-  
\ No newline at end of file
+		-  what is shared what is not
+-  file system
+	-  sys calls read, write, open
+	-  linked allocation, FAT, inode
+-  device driver
+	-  classification of io devices
+	-  io models
+	-  io scheduling
+	-  io buffering - use memroy buffer to keep copy of IO data
+	-  controller, device driver
+- 	io systems
+	- 	ports, buses, controllers
+	- 	io memory
+	- 	polling vs interrupt
+	- 	DMA
+	- 	IO performance
+	- 	zero copy
+- 	file system protection
+	- 	linux protection model
+	- 	setuid, setgid, sticky
+	- 	MAC, DAC, ACL, RBAC
+