-=> William Kitchen said to Greg Mayman
 -=> about "STILL AROUND" on 11-15-04  03:08.....

 WK> It's usually a no-connect. But there are a few that use it as an
 WK> enable input, 
 WK> and some that use it as a voltage control input. Neither of those is
 WK> very  common, but they do exist.

They are still on the PCB, so I can trace out any connections,
including pin 1.

That may not tell me what the function is, but when I see what
the pin connects to (if anything) it will help me to guess ;-)

 WK> Also, while 5V supply with TTL or HCMOS outputs are the most common,
 WK> they're  not universal. 3.3V oscillators are not unusual in newer
 WK> equipment. 2.5V and  1.8V are uncommon, but do exist. And there are
 WK> other output types such as ECL  and PECL. The sub 5V and unusual output
 WK> varieties are more often found in  surface mount packages, but they do
 WK> occasionally appear in the common 4-lead  dip14 and dip8 packages.

Point noted, but these are old boards, and every one of these
oscillators modules shows continuity from pins 14 and 7 to the
+5v and 0v rail connections.

 WK> There are even some canned oscillators with LVDS  outputs. But those,
 WK> of course, are never in the 4-lead dip packages. 

What is LVDS?

 WK> Anyway, the majority of 4-lead dip oscillators you pull out of used
 WK> computers  are going to be 5V with TTL or HCMOS outputs and no-connect
 WK> on pin1. Just be  aware that there are exceptions.

Yes, and yes. That last one is a point to be remembered always.

...There are always exceptions, even to this rule. -Murphy?

   ,-./\
  /     \ From Greg Mayman, in beautiful Adelaide, South Australia
  \_,-*_/    "Queen City of The South"    34:55 S  138:36 E
       v

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