Digital circuits. Circuits TTL. Circuits derivate from TTL: S, LS, ALS. Disturbances in the TTL circuits. Circuits CMOS, HC, HCT. Connection of circuit to the bus. Von Neumannovy and Harvardské architecture Computers. Microprocessor, block structures. Instructions, machine and operational cycles, states. Arithmetical and logical unit. Memories. Subsidiary circuits of the microprocessors. Handshake. Interrupt. Machine code, assembler, relation to the higher languages. Signal processor. Processor CISC/RISC.