m4 9914

[Tony Duell]

> 
>    The reason I suggested replacing the diff interface card is that I've 
> mixed and matched the internal boards in the old Exabyte EXB-8200 8mm 
> drives and gotten really weird behavior.  If the firmware revs in the 
> contributing drives weren't _very_ close, it was a crapshoot.  I have no 
> idea if that could be the case with your drive.
> 
>    I do diagnostics from a very low-tech perspective.  If Device X was 
> working or supposedly working before I altered it and it doesn't work 
> now, I figure the odds are high that the alteration is a contributing 

Err, yes... Hence my feeling that swapping boards, unless you have a very 
good idea that they are compatible, is a very bad idea. I've actually had 
to sort out machines where some idiot has swapped boards for totally 
incoompatible ones (i.e. swapping an RQDX1 with an RQDX3) and not 
bothering to tell me. After I've found the real fault (in the 
aforementioned machine it was stiction between the hard disk heads and 
platters), I then have to figure out just what else has been done.

-tony