Download the utility from GitHub.

• m1p1 – for Murmulator 1.x Raspberry Pi Pico (or RP2040-compatible devices).
• m1p2 – for Murmulator 1.x Raspberry Pi Pico 2 (or RP2350-compatible devices).
• m2p1 – for Murmulator 2.0 Raspberry Pi Pico (or RP2040-compatible devices).
• m2p2 – for Murmulator 2.0 Raspberry Pi Pico 2 (or RP2350-compatible devices).

Important Notes:

• Pay attention to the video output type you are using. For example, the HDMI version will not properly test VGA, and vice versa.
• If you have built a multi-output board (like Frank's design), prioritize VGA output for testing.

Expected Behavior After Flashing:

1. Two very short LED blinks on the Raspberry Pi board.
2. If long LED blinks occur afterward, count them – they indicate the GPIO number that has an (unwanted) connection with the previous GPIO.
   • There is a 1-second delay between tests.
   • If multiple connections exist, count the number of separate blinks.
3. Afterward, four very short LED blinks occur, and the program attempts to start the video output.
4. Further on-screen output should be self-explanatory.
5. A short-term loss of the image during the test is normal - the recording to the internal flash is being tested.
6. After the Done line is drawn, 8 short flashes are expected.

Additional Notes:

• Red text usually indicates an error.
• If SDRAM is soldered and detected, a linear read/write test is performed.
• If NES PAD[s] (joysticks) are connected, button press codes appear in the bottom row.
• If a PS/2 keyboard is connected, the second-to-last row shows the scan code of the last pressed key.
• Butter-brad PSRAM is supported for RP2350 only, and chip-select expected to be on GPIO-19 for Murmulator 1.x, and GPIO-8 on Murmulator 2.0

Sound Testing:

• Press S, L, or R to test PWM audio.
• Press I to test I²S audio, then L and/or R to activate left/right channels.
• Multiple keys can be pressed simultaneously to enable all channels.
• DPAD is mapped as SELECT - Left, START - Right, A - PWM speaker, B - switch to i2s

Reset & Restart:

• Press Ctrl+Alt+Del (or the Reset button on the board, if available) to reboot.
• If nothing works, power cycle the board (turn it off and on).
• Use custom overclocking: "+" or "-" key on NumPad changes CPU frequency by 4 MHz; "Ins" or "Del" key changes CPU frequency by 40 MHz.