T r o u b l e s h o o t i n g
6/4 LS/VS 550 OWNER’S HANDBOOK
Many of these following codes indicate a serious fault and the
system may halt. Switch off for 30 seconds and try again. If the fault
persists, make a note of it and call your maintenance provider.
Number of beeps
Meaning
1-1-3
CMOS write/read test failure
1-1-4
BIOS ROM checksum failure
1-2-1
Programmable Interval Timer test failure
1-2-2
DMA initialisation failure
1-2-3
DMA page register read/write test failure
1-2-4
RAM refresh verification failure
1-3-1
First 64K RAM test failure
1-3-2
First 64K RAM parity test failure
1-3-3
Slave DMA register test failure
1-3-4
Master DMA register test failure
1-4-1
Master interrupt mask register test failure
1-4-2
Slave interrupt mask register test failure
1-4-4
Keyboard controller test failure
2-2-2
Search for video ROM test failure
2-2-3
Screen believed inoperable
2-2-4
Timer tick interrupt test failure
2-3-1
Interval timer channel 2 test failure
2-3-3
Time-of -day clock test failure
2-4-3
CMOS memory size against actual compare
failure
2-4-4
Memory size mismatch occurred
Failure to boot
On completion of POST, the computer attempts to boot from a
system diskette or bootable hard disk partition. The table below lists
some of the messages that might appear during the boot sequence.
