new classiccmp.org service
ard at p850ug1.demon.co.uk
Tue Apr 12 17:37:52 CDT 2005
> As many of you have probably seen, the ClassicCmp KnowledgeBase has been
> announced in Evan's Computer Collector Newsletter.
I've taken a look at it, and I am not yet convinced this is a Good Thing...
In a couple of cases, I disagree with the advice given. I'll give my
comments below, and to be honest, they probably are personal comments
_but_ it shows there's always room for an alternative viewpoint. That's
what's great about this list, we have discussions here, nobody really
tries to be 'God' when it comes to technical matters. Alternative ideas
help a lot.
The points I've noticed so far that I disagree with are :
1) Buy a cheap Dial Test Indicator. My view : I am not rich enough to buy
cheap tools! The point of buying an expensive DTI is not that it will
last longer (you will not wear out any DTI with normal use!), it's that
it'll be more accurate. Don't your classic disk drives deserve to be set
OK, I use a DTI for other things as well (if you have a lathe it's pretty
much essential to have one), so perhaps I need a good one. But...
2) Get a digital storage scope. My view : I've never used a DSO 'in
anger', and I've done plenty of debugging. In fact I don't own a DSO. Yo
ucan do an awful lot with a good analogue 'scope and the DSO always
worries me in that you don't know what it's done to your signal before
displaying it. Good DSOs are going to be alright _if correctly used_,
cheaper ones may do all sorts of horrors... It's probably like the
analogue .vs. digital multimeter debate. I use my Fluke DMM a lot more
than my analogue VOM but if I could only have one I'd certainly pick the
analogue one. The reason is that for 99% of repairs accuracy is not that
important (and on that score , just because a DMM shows 3.5 digits does
not imply they're all meaningful!), but often showing the trend of a
signal (is it rising or falling, can I adjust for a peak, etc), is the
important thing. And that's much easier to see on an analouge instrument.
I am a bit worried that the knowledgebase will be taken as the 'gospel
truth'. I'd much rather have these sorts of things discussed here (or at
least complete discussions preserved). Many of use have our own way of
doing things. This doesn't make one of us right and the rest wrong. But I
feel it's best to present as many views as possible and let the
questioner decide what to do.
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