post code master - the site for BIOS, POST & BEEP code information

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NCR XT BIOS Post Codes

  • AA - 8088 CPU failure
  • B1 - 2764 EPROM checksum failure
  • B2 - 8237 DMA controller failure
  • B3 - 8253 PIT failure
  • B4 - RAM failure
  • B5 - 8259 PIC failure
  • B6 - RAM parity failure
  • BB - All tests passed, ready to boot
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