Silicon Graphics Altix XE250 User Manual page 185

BIOS POST Codes
If BIOS detects error 2C, 2E, or 30 (base 512K RAM error), it displays an additional word-bitmap
(xxxx) indicating the address line or bits that failed. For example, "2C 0002" means address line
1 (bit one set) has failed. "2E 1020" means data bits 12 and 5 (bits 12 and 5 set) have failed in the
lower 16 bits. The BIOS also sends the bitmap to the port-80 LED display. It first displays the
checkpoint code, followed by a delay, the high-order byte, another delay, and then the low-order
byte of the error. It repeats this sequence continuously.
007-4960-004 A-157