: A specific routine to verify the MIC and EAR sockets by recording and loading a 5-second test tone . 3. Alternative & Specialized Diagnostic Tools
: If the screen is unreadable, it uses border colors and audio beeps to signal hardware status (e.g., bit 0–7 health) . zx spectrum test program
The Spectrum uses I/O addresses 0xFE for sound, keyboard, and cassette control. A proper test program toggles the EAR and MIC ports while listening for feedback. It also tests the beeper by playing a rising scale (C-major to C-major) to check for timing accuracy. : A specific routine to verify the MIC