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== BIOS Expansion ROM == The card carries a BIOS expansion ROM at C8000. The 5150's POST scans for valid BIOS ROMs and runs any whose first three bytes match the AA 55 ''length'' signature. If the C8000 ROM is corrupted (except for its first two bytes), the [[IBM PC (5150)#Memory and ROM|10/27/82 BIOS]] beeps the "1 long + 2 short" pattern instead of the expected "C800 ROM" on-screen message โ this is a documented BIOS bug.
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