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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Garyed40 on March 08, 2005, 12:01:50 AM

Title: making my own Amiga Video adapter 23pin to 15 pin svga
Post by: Garyed40 on March 08, 2005, 12:01:50 AM

Hi all

I've given up trying to get a adapter for a reasonable price can someone direct me to a website to help me make my own adapter?

thanks everyone
Gary

Title: Re: making my own Amiga Video adapter 23piv to 15 pin svga
Post by: SamuraiCrow on March 08, 2005, 01:28:49 AM

Download the instructions HERE! (http://main.aminet.net/hard/hack/ami2vga.lha)

Please note that this isn't a very good example of how to design a circuit.  All of the grounds are connected to each other!

Digital power grounds should be connected only to the power ground and the signal grounds on the computer should be connected to the appropriate signal grounds on the VGA connecter.

Check the documentation of the A1200 for pinout information.

Title: Re: making my own Amiga Video adapter 23piv to 15 pin svga
Post by: SamuraiCrow on March 08, 2005, 01:54:21 AM

HERE (http://main.aminet.net/hard/hack/VGA_Hack.lha) is a better example of how a VGA adapter SHOULD be designed.

-edit-

It isn't much better but at least it uses a capacitor on the digital power subsystem.

Title: Re: making my own Amiga Video adapter 23pin to 15 pin svga
Post by: Garyed40 on March 14, 2005, 08:26:18 PM

Thanks Technoid

Maybe one of these days I'll be brave enough to try to make it..

Take care
Gary

Title: Re: making my own Amiga Video adapter 23pin to 15 pin svga
Post by: nex4060 on March 14, 2005, 09:31:04 PM

I had trouble to find the correct low-voltage high speed and-gate IC 74LS08N. Do any of you know an other IC I can use?

Title: Re: making my own Amiga Video adapter 23pin to 15 pin svga
Post by: SamuraiCrow on March 14, 2005, 09:54:02 PM

Sure!  Just use a hex-inverter and do a double inversion instead of tying the leads of an AND gate to the input.

Title: Re: making my own Amiga Video adapter 23pin to 15 pin svga
Post by: adolescent on March 14, 2005, 11:28:08 PM

FYI, last time I checked Vesalia (www.vesalia.de) had VGA adapters for ~$18.00.  

Title: Re: making my own Amiga Video adapter 23pin to 15 pin svga
Post by: Generale on March 14, 2005, 11:34:20 PM

I used a high speed hex inverter. Worked fine.
As for the 23pin connector in my case, I just file away 2 pins worth of a d25. Doesn't look pretty but it works. As an added bonus 25 pin shells are abundant and large enough to fit the IC and cap in. Just don't put the screw thingy in the filed off side. It'll hit the case and stop the connector from plugging in.
Just thought I'd mention it because I absolutely could not get a d23.

Title: Re: making my own Amiga Video adapter 23pin to 15 pin svga
Post by: clockmstr on March 15, 2005, 04:18:28 PM

I modified an A520 with by adding a hex inverter so my A520 had all the standard A520 outputs plus VGA out.

Title: Re: making my own Amiga Video adapter 23pin to 15 pin svga
Post by: Russ on March 15, 2005, 04:43:21 PM

$5 for male or female 23 pin solder cup connector. They are new.
http://www.mrhardwarecomputers.com/data/ms.htm

Title: Re: making my own Amiga Video adapter 23pin to 15 pin svga
Post by: amigakit on March 15, 2005, 09:43:24 PM

We sell the VGA adapters here (http://amigakit.leamancomputing.com/catalog/product_info.php?cPath=50&products_id=183) if you don't have any luck building your own.

Title: Re: making my own Amiga Video adapter 23pin to 15 pin svga
Post by: lorddef on March 15, 2005, 09:55:24 PM

I made one of those about 5 years ago, I just went to maplin and bought the closest chip I could find, didn't wory about high speed whatever etc and it worked fine untill I trod on it.

Title: Re: making my own Amiga Video adapter 23pin to 15 pin svga
Post by: Garyed40 on March 15, 2005, 10:13:44 PM

Re: making my own Amiga Video adapter 23pin to 15 pin svga


We sell the VGA adapters here if you don't have any luck building your own.

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Thanks friend but for us in the US that 14.99 GBP becomes something like $30 US. Some of us don't have that to spare for a video adapter

Gary