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#41 |
Da Digger :)
Join Date: Nov 2008
Location: Monza, Italy
Posts: 2,822
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#42 | |
Registered User
Join Date: Jan 2008
Location: United Kingdom
Age: 46
Posts: 733
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Quote:
The CM8833 takes HSYNC, VSYNC and RGB video. A SCART TV needs some control signals select the correct mode of operation so the lack of AV mode signal will not affect the operation of the CM8833. |
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#43 |
Registered User
Join Date: Sep 2009
Location: Norway
Posts: 1,715
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Any difference on this and the one sold on Amigakit? I mean, in the hardware strategy/picture quality...
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#44 |
Registered User
Join Date: Jan 2008
Location: United Kingdom
Age: 46
Posts: 733
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Hi,
Just a quick update, I have the components in stock now to allow me to experiment with the cheaper CPLD sync circuit and the more expensive video decoder/encoder and scandoubler parts. PCB design should start in the next month. |
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#45 |
Da Digger :)
Join Date: Nov 2008
Location: Monza, Italy
Posts: 2,822
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#46 |
Registered User
Join Date: Sep 2009
Location: UK
Posts: 146
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On a homebrew-looking SCART cable I got with my CDTV, which works fine on the one TV I've tested it on, the following aren't connected (on the SCART end):
5 9 13 18 8 is connected to the same wire as 16, but with different resistors between - haven't checked the effects on a widescreen TV, but SCART mode switching works fine... So basically, the only ground is composite ground... still seems to work though, but I dunno if it is displaying true RGB or not... I think it is as the picture seems sharper. |
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#47 | |
Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,448
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They are all grounds. Less important for CRT TV's but becoming increasingly more important on LCD TV's.
Quote:
23-pin Amiga socket only has RGB. If it was not "displaying true RGB" you'd have a black screen. |
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#48 |
Registered User
Join Date: Sep 2009
Location: UK
Posts: 146
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Oh right - I assumed it had composite somewhere. So what is the composite video connected to then, because it's definitely connected (and has a resistor)?
It is an LCD TV it works fine on, btw, though the picture is slightly noisy still (the colours still bleed a little, esp. black) - would connecting up the other grounds fix it? |
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#49 |
Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,448
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Composite sync OUT (on the Amiga) is connected to composite video IN (on the SCART) conveying just the horizontal and vertical position information, no picture.
Unknown, couldn't hurt if you are an accomplished solderer and can put in all the small bridges at the SCART end of the cable. |
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#50 |
Registered User
Join Date: Jan 2008
Location: United Kingdom
Age: 46
Posts: 733
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Hello,
I have finally got around to adding the full RGB/SCART guide to my website. Take a look here: http://www.ianstedman.co.uk/Amiga/am...iga_scart.html Have added some oscilloscope traces and test results from the other TVs that I tested, corrected a few typos and re-arranged the document slightly to make it flow better. Ian |
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#51 |
Registered User
Join Date: Sep 2009
Location: Sector K240
Posts: 338
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Where do you buy DB23 connectors in the UK?
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#52 |
Miggy Ate My Hamster!
Join Date: Nov 2008
Location: Lancashire, UK
Posts: 1,566
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#53 |
Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,448
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No-where in the UK that I've found (including Maplin) sell new DB-23 connectors (and shrouds).
The only mass produced item which ever used them was the Amiga (just like 13-pin DIN on Atari ST). There are the odd place online selling NOS in USA or China for about $4 inc shroud but usually you've got to buy a large number. You can cut down a DB25-pin if you have to. Last edited by alexh; 30 November 2009 at 19:47. |
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#54 |
Zone Friend
Join Date: Apr 2005
Location: Cider is best In The West
Posts: 1,238
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#55 |
Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,448
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#56 |
Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,448
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#57 |
Moderator
Join Date: Nov 2004
Location: Eksjö / Sweden
Posts: 5,651
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Ah, that spanish site. Great, but sounds like you could save a bunch by doing the 25->23 mod... you can make it pretty-ish with a Dremel, and it's covered by the Amiga D-sub, so...
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#58 |
Registered User
Join Date: Dec 2009
Location: Poole UK
Posts: 349
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I have made 2 days ago RGB cable, as I did not have much time (spent all on fighting with apollo 060) I did not use any resistors: RGB to RGB, CSYNCH to CSYNCH, 5V to RGB switch line and it works like a charm ... . Connected to high end, top quality, HD not ready TV, made special for Sainsbury and called RED. So, I switched it to PAL Hires Laced and the image is stable
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#59 |
Moderator
Join Date: Nov 2004
Location: Eksjö / Sweden
Posts: 5,651
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LCD or CRT?
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#60 |
Registered User
Join Date: Dec 2009
Location: Poole UK
Posts: 349
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It is LCD 15.4".
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