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| Amiga to VGA Adapter Schematic | ||
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Description: And here's the schematic. :-)
Picture Stats: Views: 7948 Filesize: 135.66kB Height: 768 Width: 1024 Posted by: DrDekker at October 04, 2006, 09:40:04 PM Image Linking Codes
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| Pitacas Posts:0 
| November 23, 2010, 12:55:29 PM Hello everyone! I have a doubt, with this we can use modern VGA Lcd's? I have a Pc LCD, and i want to plug in a amiga 1200, but the LCD does not sync with lower refresh rates... Regards! |
| jeffreyscurtis Posts:0
| November 20, 2009, 03:07:40 AM Because you are using the gate as a buffer. Since both inputs are tied together the output follows the input logic wise, but the output is not tied directly to the amiga port. I assume this is there to protect the amiga ports from over current or shorting. So no the hd-15 side is not always high, its only high when the input is high. |
| synthead Posts:0
| August 18, 2009, 03:37:25 PM I don't understand ... pins 1 and 2 are inputs for an and gate, and pin 3 is an output. Same to 5, 6, and 7. If you're checking for logic here, why jump pins 1&2 and 4&5? You're essentially connecting 1, 2, and 3 together because regardless of the input data on the DB-23 side, the HD-15 side will always be high. |
| countzero Posts:1938 | June 15, 2008, 02:21:07 PM ok, reading more on this, it seems if they're not buffered, amiga will think it's connected to a genlock and will not boot. |
| countzero Posts:1938 | February 27, 2008, 05:38:35 PM narmi is right. I wonder why they're buffered ? :-? on a side note, I also saw a different version of this schematic where buffered HSYNC was wired to VSYNC and buffered VSYNC was wired to HSYNC. I didn't understand what the hell they were trying to do, probably a mistake, right ? |
| narmi Posts:38
| August 27, 2007, 07:23:31 AM The 74LS08 contains AND gates, not inverters. The syncs are being buffered, not inverted. |
| KThunder Posts:1509 | March 14, 2007, 08:58:25 PM the inverter is there to allow the amiga to detect the monitor correctly and not enable genlock on the port. without it you could damage your port. |
| DrDekker Posts:325 | January 01, 2007, 12:30:00 PM @Colani1200 Well - I've been searching for the definitive answer to that one - and can't find it! What I think inverting the syncs does is ensure that the video output sync high/low corresponds with that expected by the monitor - therefore the display is correctly shown first time - every time. AFAIK getting a stable display using non-inverted syncs is a hit and miss affair which may require the monitor being switched on/off several times until a good display is acheived (which isn't good for the monitor). I can't verify this myself though. |
| Andeda Posts:594 | November 13, 2006, 09:34:06 PM Thanks for this schematic, now im going to order some parts and build one adapter for my self.. :-) |
| Colani1200 Posts:707 | October 26, 2006, 11:19:17 AM So what's the deal about the "inverted syncs" actually? What makes it different from the usual VGA adaptors? |