[Coco] new mylars

[Mark Marlette]

Dave,

Yes, I started out in the DOS version.

To date there are still tools in the DOS version that will outperform the GUI version.

Lets just say that all auto routers are not created equal. 

As Specctra isn't for everyone it is marketed as....

SPECCTRA for OrCAD - The Router Gold Standard

Maybe the gold is in the price? :)

For me it has proven itself time and time again.


Regards,
 
Mark Marlette 
http://www.cloud9tech.com 
mark at cloud9tech.com 



----- Original Message -----
From: Dave Philipsen <dave at davebiz.com>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Cc: 
Sent: Tuesday, August 11, 2015 4:55 PM
Subject: Re: [Coco] new mylars



On 8/11/2015 1:11 PM, Mark Marlette wrote:
> I did layout my first memory board by hand, just to say I did it.
>
> Took me, IIRC a full day. This was a simple board as well.
>
> It took the Specctra, yes, 8 seconds. The SuperIDE took the same computer over 200 seconds to route that card. Every trick in the book was used on that board as it should have been a four layer card.
>
> Ground bounce is a bad thing. I have had the luxury of taking high speed layout classes at work, priceless! Matching differential signals on trace lengths very critical.
>
> Been with Orcad since it it's first version release over 25 years ago.
Hey, Mark.  I don't know what OrCad is like these days but did you ever 
use the DOS version?  I used to work for a company back in the 80s that 
designed embedded controllers for the theme park market and that's what 
we used.  I'm sure things have changed a lot over the years.

In my personal experience over the years I have found that routing 
2-layer boards with signals less than 20 MHz is not too hard to do by 
hand.  There are things that the human mind can come up with that the 
auto-routers just can't duplicate...:-)

>
> I'll agree with your approach on the simpler boards, but when it comes to power planes, it is hard to keep them on just one side in a complex design. A trick is to have planes on both sides then tie together with vias....makes a small cap.
>
> What is nice is that the tools are there, something even back in the late 90's where very expensive are now free or low cost.
>
> At work they spend several seven digits a year with Mentor Graphics......I won't be moving to that platform any time soon..... :)
>
>  
> Mark Marlette
> http://www.cloud9tech.com
> mark at cloud9tech.com
>
>
>

Dave Philipsen



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