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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: x56h34 on September 03, 2004, 07:22:39 PM
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Where can one find a suitable passthrough cable, which can be used with the input port of the CV64 card and a scan doubler? Is this just a simple VGA extension cable, only very short?
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x56h34 wrote:
Is this just a simple VGA extension cable, only very short?
Yes.
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I see. :-) Thanks for the speedy reply.
So, should I expect a decrease in image quality if I use a long(ish) VGA extension cable? Is there a recommended length for the cable, or any length should do just fine?
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Don't think the cable length plays a major role when talking about the rather low freqs of native AGA-modes.
The quality of the output and if used SD/FF is far more problematic. Also you may find lots of monitors having problem with these signals (unstable picture, very dark picture etc).
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Also, the contact resistance on having an extra set of connectors defrades it a little. On an A3000 scandoubler it's certainly not enough degradation to worry about though ('cause you get to use the CV for most stuff ;-)).
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Thanks for the input guys.
I'll try to find as short as possible cable (3 feet seems the shortest available length).
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There are actually 1 feet cables just for this but 3, 5 feet or even longer doesn't seem to make that much difference to me. A cable with those "blocks" around them might give a unsignificant better picture.
(I actually use 2 cables in the 5-10feet region (both with blocks) from my scandoubler and Voodoo3 output trough a switchbox and then to my monitor and I can hardly see the difference from that and to just plugging the monitor right to video output.)
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@Brian:
Do you have an online link to a store that's selling those 1' cables, by any chance? I'm just looking for the shortest possible length in order not to trip over cables. :-)
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I know this sounds daft, but have a look on ebay for a second hand Voodoo I or II.
Cos they were 3D only cards, they came with a 6" VGA cable to connect to the 2D card.
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@Doobrey:
That's not a bad idea, although I think that the supplied passthrough cable is not a DB15 "male to male", which is required for the CV64 and a scan-doubler.
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Another question just came to my mind.
Is it true that the highest non-interlaced 24-bit mode resolution that this card can do is 800x600? If I wanna go 1024x768 in 24-bit, it would have to be interlaced, right?
Thanks.
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The Voodoo I/II came with a female to male (extension) cable.
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Can't remember, because most of times I used 16bit screenmodes. With 16bits it gave 1024x768@79hz non interlaced if I remember correctly.
If you feel enough skilled you may try to change the ram of the gfx card by other faster chips to get better refresh and speed.
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I've used my CV64 for 5-6 years now and I've had no problem at all with the quality of the scandoubler, the only problem I have is some demos (very few) when the automatic switch doesn't do it's job.
I'm not sure about the max res, I'm using 800x600 but I think it is only possible to run higher resolutions in 8bit.
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I've got a Cybervision 64 and use 1152x900@16b non-interlaced for my desktop. It can go up to 800x600@24b non-interlaced. I use CyberGraphX v4.
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@Tempest:
That's the info that I needed. Thanks! :-)
I use 1024x768 16-bit non-interlaced and it works great. CybergraphX v4 here too, with the latest patch installed.
Too bad that 24-bit modes are limited to 800x600 if you want non-interlaced display, however considering the age of this technology, regardless, I bet that the card was quite a monster when it was released. :-)
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I couldn't find straight away the clock speed for 24bit mode; 16bit seems to be 80 MHz and 32bit 50 MHz. Principally you should get at least 1152x900@24bit, perhaps even 1280x1024 but then the board should be able to clock at least 80 MHz and give just about 50 Hz ni. Of course you need to have 4 MB onboard.