BIOS error codes - PC Based Instrumentation and Control - page 473

Phoenix BIOS

Indication Meaning

One, one and three beeps CMOS read/write failure

One, one and four beeps ROM BIOS checksum failure

One, two and one beep Programmable interval timer failure

One, two and two beeps DMA initialization failure

One, two and three beeps DMA page register read/write failure

One, three and one beep RAM refresh verification error

One, three and three beeps First 64 KB RAM chip/data line failure

One, three and four beeps First 64 KB odd/even logic failure

One, four and one beep Address line failure first 64 KB RAM

One, four and two beeps Parity failure first 64 KB RAM

One, four and three beeps Fail-safe timer feature (EISA only)

One, four and four beeps Software NMI port failure (EISA only)

Two, one and up to four beeps First 64 KB RAM chip/data line failure

(bits 0 to 3, respectively)

Two, two and up to four beeps First 64 KB RAM chip/data line failure

(bits 4 to 7, respectively)

Two, three and up to four beeps First 64 KB RAM chip/data line failure

(bits 8 to 11, respectively)

Two, four and up to four beeps First 64 KB RAM chip/data line failure

(bits 12 to 15, respectively)

Three, one and one beep Slave DMA register failure

Three, one and two beeps Master DMA register failure

Three, one and three beeps Master interrupt mask register failure

Three, one and four beeps Slave interrupt register failure

Three, two and four beeps Keyboard controller test failure

Three, three and four beeps Screen initialization failure

Three, four and one beep Screen retrace test failure

Four, two and one beep Timer tick failure

Four, two and two beeps Shutdown test failure

Four, two and three beeps Gate A20 failure

Four, two and four beeps Unexpected interrupt in protected mode

Four, three and one beep RAM text address failure

Four, three and three beeps Interval timer channel 2 failure

Four, three and four beeps Time of day clock failure

Four, four and three beeps Maths coprocessor failure