xltMicro4 app for iPhone and iPad

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.

- Programming
1 (Select program number)
2 (Show Edit-area) Touch HexText
3 (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 program
1 (Hide Edit-area) Touch HexText
2 (Run program) Touch RUN
3 (Stop program) Touch RESET

- Understanding behavior
1 (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.