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error POST code (audible) meaning?

I am working on an old AT machine which won't boot. No display. The audible POST error is 11 short beeps...pause...then 11 short beeps...ad infinitum. I plugged in a SOYO TechAid PCI card which gives a reading of 06 during the beeps and d3 at the pause. The only "06" that I can find in the TechAid manual is power supply. Does anyone know if the 11 short beeps corresponds to that?(power supply that is). I'm asking because it isn't that easy to just swap out a power supply on an AT.(at least I don't think it is) If anyone confirms that power supply is a good probability then I will go to the trouble to try a new one. Thanks for your help.
atf3doc
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atf3doc
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atf3doc
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3 Solutions
 
tmj883Commented:
11 short beeps is a mainboard cache memory error...reseat or replace.
06...uncompressing the post code...d3...memory sizing error(cache)...
T
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willcompCommented:
See if BIOS provider is printed on BIOS chip.  If it's AMI, and I suspect it is, beeps indicate a cache memory error.  Most AT systems had separate cache memory which can be removed provided cache jumper setting is changed to reflect no cache.  If that doesn't clear error, either mobo or CPU has likely failed.

Changing out an AT power supply is straightforward.  The only tricky part may be accessing the switch terminals and ensuring that wires are properly connected.  Position matters on an AT.  There is 120VAC at switch and wires must be properly connected.  Usually the black and white go on top with brown and blue on bottom.  Black is on top of brown (hot leg) and white is on top of blue (neutral).  Most AT power supplies have a wiring diagram on case.  However, I don't believe you have a power supply problem.

We may be able to provide more info if you can provide manufacturer and model of motherboard.
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Computerguy107Commented:
If your machine is more than 3 years old then I would say....don't bother me....if it is less than 3 years old...change out the cards one by one...if it comes down to your motherboard....bite the bullet and get a new machine...
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nobusCommented:
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atf3docAuthor Commented:
The motherboard is a Tyan Tsunami S1830S and the BIOS is AMI.. Where is the cache memory located?
atf3doc
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atf3docAuthor Commented:
I just downloaded the manual from Tyan..(I am impressed at the ease of finding old motherborad information from Tyan)...
Manual says on Pentium II cache memory is located on the processor so there is no need for cache on the motherboard..So...I guess that indicates that the CPU is bad...I may have an old Slot 1 processor kicking around here somewhere.
Glad to not change out the power supply. I know it isn't that hard...just more time consuming than an ATX, especially if the leads to the switch are soldered.
I'll keep you all posted on my progress. In the meantime if you have any other ideas, please let me know. Thanks
atf3doc
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willcompCommented:
Since you are getting codes on POST card, CPU is at least partly functional as is motherboard.  On a PII, L2 cache is on CPU mounting card and not CPU itself, so CPU is a real possibility.
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atf3docAuthor Commented:
Well....i replaced the  slot 1 processor....same results. Of course I don't know whethter this PII is any good. I may dig around and see if I have one in my bone yard that I can check and try that one.
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willcompCommented:
Motherboard is also a likely culprit.  If a known good CPU returns same error, probably mobo.  Also try different system memory if you have replacement available or use 1 stick at a time if there are multiple sticks.
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Booda2usCommented:
Boy, it's hard to be sure since you didn't give us the BIOs manufacturer or the year of manufacture, but usually 11 beeps means: CMOs status register initialized; going to disable DMA and interrupt controllers . (AMI BIOS) ..Booda2us
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Booda2usCommented:
My answer came from the 4th edition of Bigelow's 'Troubleshooting, Maintaining, and Repairing PC's'. Pages;684,681,671. Since we never told what year or what AMI bios it was how does the link above that NOBUS posted provide a better answer? >"Old AT Machine"< ...Booda2us
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atf3docAuthor Commented:
I apologize if it seems that I didn't split the points to your liking; I based my awards on speed of response and input.
It appeared to me that you had not thoroughly read all threads before making your submision.I had listed the BIOS manufacturer and Motherboard manufacturer about three days prior to your entry. Nobus' link gave same report as did the Tyan manual,"cache memory error." Again, thanks for your input .
atf3doc
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