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From:	"Atommann (atommann AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date:	Mon, 24 Oct 2016 10:24:02 +0800
Message-ID:	<CANDNR8oD1XumuegoYJEAbpEEzK_XEjv0WZ_rtiwg4DwoxNfK-Q@mail.gmail.com>
Subject:	[geda-user] COSMAC ELF in gEDA and the power rail problem for logic ICs
To:	geda-user AT delorie DOT com
Reply-To:	geda-user AT delorie DOT com

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/

-- 
Best regards,
Atommann

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