Emerson Arcadia 2001

Boots the Emerson Arcadia 2001 straight into a public-domain Signetics 2650 demo cartridge (there is no console BIOS): it paints a blue/yellow title screen with a colour bar and uses the UVI beeper. Sound is fully supported; the page starts muted, so click Sound. Press keypad 1 to 4 (number row 1-4, or the on-screen Player 1 pad) and the demo drops a marker and raises the pitch, showing controller input. Player 2 is the numeric keypad. Add ?debug, or click Debug, to single-step the 2650, set breakpoints on the IAR, watch UVI memory for writes and disassemble the 2650 opcodes. Click the screen first so it captures the keyboard.