Thread

DIY ADC to VGA lead

DIY ADC to VGA lead Software 6 posts Oct 23, 2013 — Oct 26, 2013

#1 Wed, 23 Oct 2013 - 15:26

I was wanting to run dual displays on my PowerMac G4, but unwilling to spend £30 on the adapter to turn the ADC port into something more useful. This cludgy mess is what I came up with

- it does work though! I used the connector from an EVC cable which I got on eBay for £2.50, but removed the original shroud from the plug so it would fit in the socket.

#2 Wed, 23 Oct 2013 - 15:38

Nice hack. If it does what needs to be done and you can't see it anyway, it doesn't need to be pretty.

#3 Fri, 25 Oct 2013 - 23:02

The analog signals used by VGA are present on the ADC socket. The problem folks usually run into, is that almost none of the ADC<=>DVI adapters propagate those analog signals the DVI analog pins.

So a combination of ADC > ADC/DVI adapter > DVI/VGA adapter usually does not work.

It should be relatively trivial to open up an ADC/DVI adapter and connect up the analog pins at both ends properly.

#4 Sat, 26 Oct 2013 - 04:32

but removed the original shroud from the plug so it would fit in the socket

So apart from the rounded shroud, (and the power/USB pins) ADC = DVI?

#5 Sat, 26 Oct 2013 - 04:40

It's just 6 extra pins for

LED, 25V, 25V, USB Data +, USB Data -,USB Return

same pins after that but different orientation.

source:

http://pinouts.ru/Video/apple_adc_pinout.shtml

http://pinouts.ru/Video/dvi_pinout.shtml

#6 Sat, 26 Oct 2013 - 09:09

I did write down the diagram which I used to make the cable -