D i a g n o s t i c c o d e s
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POST beep codes
Certain tests are performed before the video subsystem is initialised, thus
requiring the speaker to emit beep codes in the case of a failure. The
following table describes the various codes and their meaning.
Diagnosti
c code
Number of
beeps
Meaning
02h
1-1-3
CMOS write/read test failure
03h
1-1-4
BIOS ROM checksum failure
04h
1-2-1
Programmable Interval Timer test failure
05h
1-2-2
DMA initialisation failure
06h
1-2-3
DMA page register read/write test failure
07h
1-2-4
RAM refresh verification failure
08h
1-3-1
First 64K RAM test failure
09h
1-3-2
First 64K RAM parity test failure
10h
1-3-3
Slave DMA register test failure
11h
1-3-4
Master DMA register test failure
12h
1-4-1
Master interrupt mask register test failure
13h
1-4-2
Slave interrupt mask register test failure
15h
1-4-4
Keyboard controller test failure
1Bh
2-2-2
Search for video ROM test failure
1Ch
2-2-3
Screen believed inoperable
20h
2-2-4
Timer tick interrupt test failure
21h
2-3-1
Interval timer channel 2 test failure
23h
2-3-3
Time-of -day clock test failure
27h
2-4-3
CMOS memory size against actual compare
failure
28h
2-4-4
Memory size mismatch occurred
Example: Keyboard controller test fail, the speaker would emit one beep,
pause, then four beeps, pause, then another four beeps, followed by a long
silence. The beep pattern may then keep repeating. In most cases where beep
codes are used, the failure is of a serious nature and the system is halted.
Other BEEP codes
There are a few other codes that occur, but please note that some are system
beeps that will be heard during normal operation.
No beeps
. If no beeps are heard at all the speaker may be disconnected or
there may be a speaker circuitry fault.
One short beep
. Marks the completion of POST and no functional errors
found. You will also get a single beep if you press an invalid key for a power-
on password.
Two short beeps
. Indicates and draws your attention to an error during
POST. This should be accompanied by an error code from the table below.
Three short beeps
. System memory error, normally accompanied by code
201, but beeps are used when the video cannot display the code.
Continuous beep
. Could indicate a serious failure of the system
motherboard, or a failure of the speaker circuitry.
Repeating short beeps
. Usually indicative of a keyboard key stuck down, but
may be due to the keyboard interface failing.
One long and one short beep
. POST has detected an error on the video
adapter in the system. There may well be no display on the screen.
Summary of Contents for APRICOT FT4200
Page 1: ...FT4200 Owner s Handbook NATIONAL ACCREDITATION OFCERTIFICATION BODIES ...
Page 2: ...APRICOT FT4200 OWNER S HANDBOOK ...
Page 10: ...APRICOT FT4200 Section One Startup and operating Upgrading and expansion ...
Page 36: ...APRICOT FT4200 Section Two Detailed service Information for authorised engineers ...
