COCO 3 clock speed

[a...@utcs.uucp]

When I got my new COCO 3 home all seemed fine except that the image it
produced on my TV screen was wavering somewhat. I thought perhaps some
hum was coming from the power supply and took the machine back to the
store to compare it with another one. As to be expected, when I got there
my machine performed flawlessly. I even took it to a second store to
try it out there. Again, the display seemed fine. I was about to give up
and assume that some strange interaction between my TV and my COCO 3 was
occurring. Thing was though, I also have a COCO and a COCO 2 and they
didn't exhibit this problem. Then I remembered that home television use
a refresh rate of 60Hz so that any hum that might creep into the display
won't cause screen wavering. Perhaps the COCO 3 clock was of frequency.
I decided to check this out using the TIMER function built into basic.
The result of my experiment, which by this time came as no surprise, was
COCO 3 counts of 60 seconds in about 58 seconds or real world time.
Again I went back to the store, this time armed with my little timer
program. To my suprise, their COCO 3 also took 58 seconds to count
of what should have been 60 seconds. Next we tried 4 more COCO 3's.
All seemed to run fast. Now this amounts to a 3% error. Hard to
imagine that this is just slightly off crystal. Perhaps all you who
have access to a COCO 3 could try checking them to see if they run fast.
My little timer program is listed below (as well as I can remember it):
10 TX=999
20 TIMER=0
30 '
40 T=INT(TIMER/60)
50 IF T<>TX THEN PRINT T:TX=T:SOUND 100,1
60 GOTO 30