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Amstrad CPC 464 Troubleshooting Guide
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=== Branch B — Garbled display, no Ready prompt === * Wavy or wrong-coloured display: usually monitor — check brightness control, DIN cable, and the monitor's internal connectors before suspecting the system unit. Suspect '''CRTC IC108''' if vertical hold drifts. * Patterned garbage on screen, never resolves to a boot screen: '''RAM failure'''. The CPC 464 uses eight 64 K×1 RAM chips (HM4864P-2 or 4164-equivalent) at IC117–IC124. A single bad chip produces a regular pattern of corrupted pixels because each chip provides one data bit across all 64 KB of system + video RAM. * "Amstrad 64K Microcomputer" displayed but then hangs before "Ready": likely OS ROM IC103 corrupt, or a subset of RAM failed in higher addresses. Reseat IC103 (or reflow if soldered).
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