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    Fixing a Portable M5120; Divide by Zero Error(?)

    It chimes, then death chimes. Sad Mac error code 01000400 0007FFF6 I am stuck. Following http://myoldmac.net/FAQ/SADerror-portable.htm to decode results in ROM test failed, divide by zero. At a guess, there are traces hiding under chips that are bad, or logic chips were zapped by someone...
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