A "Sad Mac" error screen, with the error code 0101C3 printed underneath the Sad Mac icon, indicating a ROM checksum failure.

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1. Keith Kaisershot (blitter@mastodon.social)'s status on Wednesday, 31-Jan-2024 04:43:05 JST Keith Kaisershot

   in reply to

   My Brainstorm Plus chirps out the signature "boot beep" at startup, but then during POST immediately produces a Sad Mac with error code 0101C3. The leading "01" signifies which test failed; in my case a ROM checksum failure, suggesting some kind of ROM corruption. The remaining digits are largely useless, based on the (incorrect) result of the checksum algorithm.