Mark, many tnk's for your answer.
Let me explain my problem.
I bought from Dontronics the Jim's Phoenix programmed 17c42.
The chip is an upgrade to the Microchip 16B1 programmer.
I don't own a 16B1, a friend of mine borrow me his 16B1 and I was able to get
the
schematic. My need is to rebuild the 16B1 with Phoenix firmware just to program
parallel programming chip like 16C5x.
5.0688MHZ vs. 5MHz mean 1.3% of error in clocking.
I am sure that it is not a problem for RS232 operation, but I'm not so sure that
it
don't make any problem to programming timing and nobody can know more
about it then the guy that have written the program.
I don't know, because I don't have the 17c42 data sheet, if it needs a parallel
or a
serial style crystal.
I don't know why Jim don't answer to me.
I bought his work and I don't say he must answer to me, but usually I expect
some post
sales assistance.

ciao

                       Claudio Rachiele IW0DZG


Mark Willis <mwillis@foxinternet.net> on 10/20/99 10:14:17 PM

Please respond to Mark Willis <mwillis@foxinternet.net>

To:   Claudio Rachiele IW0DZG/Italy/IBM@IBMIT
cc:   Mark Willis <mwillis@foxinternet.net>
Subject:  Re: phoenix




Claudio, if you need or just want a 5.0688 MHz crystal, I can get one
and just airmail it to you;  Digi-Key has them at $0.84 USD, Mouser is
probably cheaper, postage would be another $1 or so (guessing), so I can
just get one to help you out, maybe do me a favor some day later.  I'm
not rich, but inexpensive is inexpensive <G>  I'll be placing orders
with Mouser and/or Digikey in a couple days here, just make sure I know
whether you want a Series (or Parallel) style crystal, don't want to get
you the wrong part!  (Better yet, if I know the Mouser or Digi-Key part
number, I can match that.)

  Mark

Claudio Rachiele IW0DZG wrote:
>
> Jim, I sent you a mail directly to not increase the noise on the list,
>  but I havent any answer from you.
> I have seen that you answer to the guy asking to the list.
> Now I ask to the list too, maybe I got the answer.
> I don't know if there are some tight timing loop that don't tollerate
> 1.3% clock error.
>
> LMK
>
> ciao
>
>                        Claudio Rachiele IW0DZG
>
> ---------------------- Forwarded by Claudio Rachiele IW0DZG/Italy/IBM on
> 10/20/99 10:54 AM ---------------------------
>
> Claudio Rachiele IW0DZG
> 10/18/99 10:45 AM
>
> To:   newfound@pipeline.com.au@internet
> cc:
> From: Claudio Rachiele IW0DZG/Italy/IBM@IBMIT
> Subject:  phoenix
>
> Jim, I bought your phoenix 17C42 to make a parallel programmer for 16C5x.
> The original schematic use a 5.068 MHz xtal. I can't found it in my country.
> Can I use a 5 MHz xtal istead of or the timing error ( 1.3 % ) is too great to
> let the programmer works ?
>
> TIA
>
>                        Claudio Rachiele IW0DZG