I was a bit cryptic, I was heading out of the office...

At 05:42 PM 2/11/2002 -0500, Abd ul-Rahman Lomax wrote:
>At 02:18 PM 2/11/2002 -0800, Brad Velander wrote:
>>I understand your point guys, about the rotated pins being usually off-grid.
>>However with setting the grid down to 1 and the electrical snap to hotspots
>>on, one can ensure that the connection is valid.
>"could", not "can", I think.

Yes, one could take care to ensure that connections are valid. The cost is 
only time and only money. Let's say that I would hate to be the recipient 
of a schematic with off-grid connections (grid being .1 inch in Schematic).

In fact, I'll put it in past tense: I hated to be the recipient of such a 

I'm not sure what would happen to a rotated pin and grid snap. The rotation 
would generally take the endpoint off of grid 1 (which is .01 inch); doing 
this would require the whole database to be modified to higher precision, 
it would make schematic analysis take longer, etc., etc.

And it is very difficult for me to detect an advantage to it. It would be 
quite rare for it to be useful. I do sometimes wire at 45 degrees or other 
angles, remember the old standard flip-flop pattern? If you want to swap 
lines it is really neat to have them cross each other at 45 degrees, it 
uses minimal space and is crystal clear to the reader. But that is about as 
far as I stray from strict orthagonal wires and it does not involve going 
off grid.

If it were up to me, though, I would make it impossible to place hot spots 
on pins anywhere else than on .1 inch grid. I've seen nothing but grief 
from engineers who turned off grid, both with Tango and Protel schematics. 
I may have seen this particular disaster in OrCAD as well, but I'm not sure.

Perhaps there could be a schematic library tool that rotated primitives at 
other angles. This would make it easy to draw rotated parts. But I'd still 
highly advise having the hot spots of pins on .1 grid, and perhaps the 
rotation tool would not rotate pins and would not take them off the current 
grid setting.

While we are on the subject, a little reminder that rotated text in Protel 
is deficient. If I rotate or mirror a part on a schematic, I want the text 
block to occupy the same space. Protel does know to keep it reading 
correctly, but it does not shift the text reference point to keep the text 
block in the same location. As a result, symbols containing text generally 
become garbage when rotated or mirrored. This should be easy to fix....

Abdulrahman Lomax
Easthampton, Massachusetts USA

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