List of Available Crystals

17.734475 MHz (PAL, Video Synchronizing)
 4.194304 MHz (Master Accurate CPU Time Base, PIC, ATMEL)
 4.000000 MHz (commonly used CPU Timing xtal) PIC, ATMEL)

32.768000 KHz (Main Accurate Watch Freq, time base)
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A more Detailed description of application follows
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17.734475 MHz, mostly used on PAL (Australian) TV systems for frame
video synchronising etc. used commonly with the STV5730 Overlay Text.-
- - -
4.194304 MHz for microprocessors, the 'correct one' not
the 4MHz as commonly misused by those NOT in the know .
Why do you ask ?,
well, 4.194304 MHz is  2 to the power of 22,
meaning in the proper normal calculations,
NO Fudge Factor is required to 'correct' as in
timing systems using clock display.
Therefore the wander 'drift' is minimal
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But be WARNED, If the designer of the original circuit
has used a 4MHz XTAL, then you CANNOT substitute,
a 4.194304 for a 4MHz xtal,  unless you have 
access to the *.asm (assembly code) > HEX compiler 
and a full UNDERSTANDING of CPU timing circuits.
- - -
4.oo MHz for those projects requesting a 4 meg rock.
If you need it for a project, then YES, we can supply it

4.oo Mhz xtals for general timing, where accuracy is NOT a real need
4.194304 Mhz xtals offer the most accurate time base other than
an Atomic Time Base, or soon a GPS module with time decode output.
- - -
32.768 Khz (watch crystal) for more cpu timing projects
(2 to the power of 15) for those wanting easy mathematics
in common sense timing calculations
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Most XTALS are HC49 xtals a few dollars (from DSE, JAYCAR, ALTRONICS etc)
or over the counter at 41 Arlewis st. Chester Hill 2162 NSW Australia
prices approx as of 1999/2000 January
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Typical Divide by 2 Chain.

4.194304 (MHz) * (in stock) <<< a real timing crystal
2.097152 (MHz)
1.048576 (MHz)
524,288  (KHz) 
262,144  (KHz) 
131,072  (KHz)
65,536   (KHz)
32,768   (KHz) * (in stock) <<< also very accurate
16,384   (KHz)
8,192    (KHz)
4,096    (KHz)
2,048    (KHz)
1,024    (KHz)
512      (Hz)
256      (Hz)
128      (Hz)
64       (Hz)
32       (Hz)
16       (Hz)
8        (Hz)
4        (Hz)
2        (Hz)
1        (sec)

(see how easy it divides,!!!)