RL02 write faults, fixed it! Another cable mistake

6 Jan 2006

...

  [snip - very instructive part]

 However, I now know much more about RL drives than I care to, and
 can fix the logic if it ever really does fail :)

 -Charles   =

 Yes, working your way through the schematics, actually measuring the
 signals, makes you "learn" how something works - in detail! 
Doens't it just.... A lot more than easter-eggging parts, anyhow :-)

More seriously, having done this sort of thing many times, I have found 
it a great way to understand it all works. A day spent attacking a 
TTL-built minicomputer CPU with a 'scope or logic analyser and the 
printset will teach you a lot more than most books on the subject.

And I find it a great feeling when you finally track down the fault, 
however 'stupid' the casue 

(BTW, I've had that short from IDC sockets on DEC board headers. It's a 
nasty fault the first time you get it...

-tony

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RL02 write faults, fixed it! Another cable mistake