The Protel AR is good for more than small TH PCBs.  I have used it on SMT
multilayer boards with no problems (but some annoyances!).  It doesn't crash
on me, but it will do stupid things (multiple routes from a pad to a ground
plane, for example).

If you have 1024 channels of identical ciruitry, you are probably better off
hand-routing 1 channel and copying it 1023 times.  Then manually route to
the connectors.  Don't give it to the AR, it will come up with 1024
different ways to route the same circuit!

Best regards,
Ivan Baggett
Bagotronix Inc.
website:  www.bagotronix.com


----- Original Message -----
From: "Jun Gong" <[EMAIL PROTECTED]>
To: "'Protel EDA Forum'" <[EMAIL PROTECTED]>
Sent: Wednesday, October 16, 2002 6:06 PM
Subject: Re: [PEDA] Fan out Vias


> You are right. I never use autorouter. even for small board. You can not
> rely on it to do whole job or complex job.
>
> I have a large board, contains 1024 SO-8 chips, 256 capacitors, and
> connectors for 1024 input signal, 1024 output signals. When I firstly used
> protel 99se to auto-route it, Protel 99se quitted the job after 1 hour
> without doing any modification on it. When I used ProtelDXP trial version,
> DXP worked very hard, it even exhausted my  600M virtual memory , forced
> Win2K to enlarge its virtual memory. But after 67 hours 53 minuts, DXP
also
> looked dead, and its last message was "finished 2172 connections of 3490
> total connections."
>
> I think Protel router can hand small through-hole PCB. Don't try it on big
> board, or board with many SMD parts.
>
> With proper rules and careful placement, you can let it do simple jobs,
such
> as fan-out, memory routing.
>
> Jun


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