[Techtoolslist] James has been busy!

[James Bright]

Another hint... every now and then I'll either get a ROM that has a bad signature, replace it and it still has a bad signature. OR I will get all ROMs reported as bad. Usually that's a pretty easy chip select problem. I find that the 9010A probe narrows these types of problems very, very quickly.

JB

----------------------------------------
 From: Martin White <martin at guddler.co.uk>
Sent: Wednesday, September 14, 2005 2:55 AM
To: Technical Tools Mail List <techtoolslist at flippers.com>
Subject: Re: [Techtoolslist] James has been busy! 


> By the way, can someone explain the difference between a fluke 

> signature and

> a checksum? Sometimes my fluke reports a bad rom signature, but that

> doesn't necessarily mean the rom is bad does it?

>

> Matt


No. But it does mean that EITHER the rom, or the circuitry going to 
or from the rom is bad. Pop the rom out, dump the rom, then use fluke 
IDE to calculate the signature of that rom dump and make sure it's 
what you were expecting. Then if it wasn't then the rom is bad, else 
start looking at address and data buffers and chip selects and the like.

Martin.
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