Simulator
Runs the actual V0061.34 firmware on a faithful 1802 emulator — the same bytes the hardware executes. Step one opcode at a time and watch the VM core change; the side panel disassembles the running program and tracks the current instruction.
The core status bar counts the raw 1802 instructions behind each STELLAR opcode — this op and the running total. (The first instruction after START also carries the one-time label pre-pass.)
Serial terminal
Click the terminal and type to send keys to the running program — Enter, Backspace and Ctrl-key combinations all go through. On a phone or tablet, tap the terminal for the keyboard; the arrow keys, Esc and Enter are in the row underneath. The input box above just pre-loads keystrokes before you start.
Front panel
Disassembly — running program
Memory — $2F00 to $7EFF
CIDP page, the four VM cores and the four program blocks. Updates live as the program runs. Click a line in the disassembly to set a breakpoint.
The first step runs STELLAR's CD label pre-pass; interactive stepping then begins at the first real instruction. Look up any opcode in the reference.