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26 September 2010, 12:02
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#1 |
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Registered User
Join Date: May 2006
Location: France
Age: 48
Posts: 211
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Passive RGB to VGA?
Hello,
I found this: http://amigaga.chez-alice.fr/classic...o/adaptvga.htm It's in french but basically it says to connect directly the DB23 to a DB15 port without any hardware. Don't know how it can work without the HSYNC beeing 31,25KHz. Is there a mode and/or amiga model compatible with that? |
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26 September 2010, 13:10
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#2 |
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Registered User
Join Date: Jun 2010
Location: PL?
Posts: 2,865
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it will work with multisync monitors that are capable to sync from 15.625kHz.
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26 September 2010, 15:41
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#3 |
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Registered User
Join Date: May 2006
Location: France
Age: 48
Posts: 211
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OK, so it's a very restrictive solution
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26 September 2010, 16:08
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#4 |
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Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,448
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Also works with AGA Amiga's in DoubleScan 31KHz modes (i.e. workbench only, not games)
It is a standard part known as a Sync Dongle http://www.amiga-hardware.com/showha...D=733%22%3ERGB |
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27 September 2010, 23:47
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#5 |
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Registered User
Join Date: Oct 2009
Location: Oswego, IL
Posts: 125
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Didn't the Commodore one have a chip (filter) inside? I thought it had something, was more than just a straight adaptor
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27 September 2010, 23:57
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#6 | |
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Global Moderator
Join Date: Aug 2008
Location: Sidcup, England
Posts: 10,300
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Quote:
Last edited by prowler; 28 September 2010 at 00:04. |
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28 September 2010, 08:25
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#7 |
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Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,448
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Buffered video dongle : 390682-01
Sync generating video dongle : 390682-03 Unsure what the difference is but I've only ever had the -01 part which is little more than straight through. I wonder if the circuit is for generating SOG? The -03 part is described as "being compatible with the video toaster" and is apparently a bit more complicated, Edit : Hmmm this seems to have a better description on how it works http://amiga.resource.cx/exp/syncstrainer Last edited by alexh; 28 September 2010 at 08:35. |
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28 September 2010, 09:46
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#8 |
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Registered User
Join Date: Feb 2010
Location: Lincolnshire, England.
Age: 75
Posts: 167
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Passive RGB to VGA?
Hi,
See http://wonkity.com/~wblock/a4000hard/connvga.html Quote "VGA monitors can be connected to the A4000; however, since the special circuitry in the Amiga video output can mistakenly identify a monitor as a genlock and thus cause problems, a special cable or adapter is the best way to hook them up. All this cable really does is buffer the horizontal and vertical sync signals by double-inverting them through a TTL gate. Commodore's DB23-to-HDD15 adapter (supplied with most A4000s) used a 74HCT08 for this," Regards, Michael aka rockape |
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28 September 2010, 10:27
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#9 |
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The 1 who ribbits
Join Date: Apr 2006
Location: leek, Staffs, UK
Age: 56
Posts: 3,557
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If this one from amigakit is anything like the one I have then its just a straight through connection
http://amigakit.leamancomputing.com/...roducts_id=183 Thats some good info rockape, thought it was just a couple of not gates in my other connector 
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