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Subject: Re: [geda-user] COSMAC ELF in gEDA and the power rail problem for
 logic ICs
References: <CANDNR8oD1XumuegoYJEAbpEEzK_XEjv0WZ_rtiwg4DwoxNfK-Q AT mail DOT gmail DOT com>
To: geda-user AT delorie DOT com
From: "Barry Jackson (zen25000 AT zen DOT co DOT uk) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Message-ID: <db575568-dd26-baa5-57cd-15b664e71fef@zen.co.uk>
Date: Fri, 18 Nov 2016 00:30:15 +0000
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On 24/10/16 03:24, Atommann (atommann AT gmail DOT com) [via 
geda-user AT delorie DOT com] wrote:
> Hi,
>
> Recently I redraw[1] the cosmac elf microcomputer which was from the
> Popular Electronics magazine 1976 August issue. And soldered one[2],
> it works right away!
>
> But when I was making it in gEDA I met a problem. For example for the
> CD4013 D-type flip-flops symbols, it has built-in VDD and VSS nets.
> But the pins for them are now shown. I searched gEDA's mainling list
> and people suggested that you can make a symbol which only has the VDD
> and VSS pins.
>
> So I make these power symbols. But pcb says that:
> Error! Element U12 pin 14 appears multiple times in the netlist file.
> Error! Element U12 pin 7 appears multiple times in the netlist file.
>
> U12 is CD4013.
>
> I delete these power symbols and connect VDD to +5V and VSS to GND.
> pcb gives me the following warming message.
> Warning! Net "+5V" is shorted to net "VDD"
> Warning! Net "GND" is shorted to net "VSS"
>
> Any suggestions?
>
> Thank you.
>
> [1] https://github.com/magismoke/cosmac-elf
> [2] https://www.flickr.com/photos/atommann/30489781476/in/dateposted-public/
>

I had a similar issue with a dual op-amp and the post by John Doty here 
helped me resolve it.

http://www.delorie.com/archives/browse.cgi?p=geda-user/2016/10/06/07:51:04

Barry