This is a simulator of 4bit-microcomputer used for teaching materials of technical arts.It can play few types of sounds and control LEDs.You can set program by entering a hexadecimal string into the edit-area. This hexadecimal string is saved in a memory selected by program selector, and is reloaded from the memory when you change selector.- Programming1 (Select program number) 2 (Show Edit-area) Touch HexText3 (Write Hexadecimal data) Select Edit-area and input series of hexadecimal numbers and touch 'done'.4 (Check program) The disassembled program appears when 'DA' is selected.- Execute program1 (Hide Edit-area) Touch HexText2 (Run program) Touch RUN3 (Stop program) Touch RESET- Understanding behavior1 (Switch to single-step-mode) Select 'step' of speed-selector. Then register-view will appear.2 (Start execution) Touch RUN. The simulator executes single command, stops execution and shows registers.3 (Execute next command) Touch 'Next'. Address of next execution point is marked by asterisk at disassembled text.