Mike, to follow-up, I've been looking into crystals as part of my
PIC-based logic analyzer. For folks using the 16C76/77 parts, the following
common crystals will provide 115.2Kbaud and 0% error with BRGH = 1:

       3.6864 Mhz -> SPBRG = 1
       7.3728 Mhz -> SPBRG = 3
      11.0592 Mhz -> SPBRG = 5
      14.7456 Mhz -> SPBRG = 7
      18.4320 Mhz -> SPBRG = 9

   - Tom

At 12:39 PM 5/25/98 -0400, Mike Keitz wrote:
>On Mon, 25 May 1998 09:44:04 -0600 Matt Bonner <mbonner@SUNADA.COM>
>writes:
>>Tjaart van der Walt wrote:
>>>  1.8432MHz
>>   2.4576MHz ... Any more?
>>>  3.6864MHz
>>>  11.0592MHz
>>
>>> You can get all the standard baud rates with these crystals.
>
>There are two major 'series' of frequencies, with standard crystals
>available at each power of 2 in the series:
>
>(9600 * 192): 1.8432, 3.6864, 7.3728, 14.7456 MHz
>(9600 * 256): 2.4576, 4.9152, 9.8304, 19.6608 MHz
>
>A 9.8304 is a good match for a 10 MHz PIC16F84, or 19.6608 with a PIC
>rated for 20 MHz.  Most 4 MHz PICs have no problem with 4.9152, but use
>3.6864 to be safe.  Also fairly common are 18.432 (1.8432 * 10) and
>11.0592 (1.8432 * 6).  The latter is very popular with 8051 type
>controllers because of the way they divide the clock.  Frequencies of
>6.144 (9600 * 640) and 12.288 MHz were commonly used with Intel parts
>rated for 6 or 12 MHz respectively.
>
>
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