Olin Lathrop wrote:
>> I purchase the multichip programmer from Talking Electronic.
Because
>> my PC do not have the 9 pins serial port. I am using the modem
>> serial com port 2. The modem port is 24 pins and it parallel out
the
>> 9 pins connector. I connect the modem parallel out 9 pin female
>> connector to the multichip 9 pins male connector.
>
> It is hard to make sense of this description, but:
>
> 1  -  COM ports come in two standard sizes, 9 pin and 25 pin.  If
you
> have a
> device that wants a 9 pin port, you can get an off the shelf adapter
> so that
> it can be plugged into a 25 pin port.
>
> 2  -  Both interfaces are serial, not parallel.  The 25 pin is a
> superset of
> the 9 pin.  The extra lines available in a the larger connector are
> rarely
> needed.
>
> 3  -  A 25 pin serial (COM) port can use the same connector as the
> parallel
> (printer) port, so you have to be careful which one you are plugging
> into.
> Most newer PCs only come with 9 pin serial ports, which makes this
> much
> easier.

At the back of your PC:
-----------------------
DB25 serial port = Male connector (pins at connector).
DC9 serial port = Male connector (pins at connector).
DB25 parallel port = Female (holes at connector).

Wagner Lipnharski - email:  wagner@ustr.net
UST Research Inc. - Development Director
http://www.ustr.net - Orlando Florida 32837
Licensed Consultant Atmel AVR _/_/_/_/_/_/

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