What fit on the slot connector on ISA video cards

Discussion about old PC hardware.

What fit on the slot connector on ISA video cards

Postby skitters » 2016-11-27 @ 06:16

Some ISA video cards have a slot connector on top?
For example the Trident 8900c in the attached picture.
What fit onto that top slot connector?
8900c.png
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Re: What fit on the slot connector on ISA video cards

Postby sprcorreia » 2016-11-27 @ 06:44

Other cards. I have a MPEG decoder card that uses that connector.
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Re: What fit on the slot connector on ISA video cards

Postby feipoa » 2016-11-27 @ 09:34

sprcorreia wrote:Other cards. I have a MPEG decoder card that uses that connector.

Interesting. Do you have a photo of it with specs? How well does the MPEG decoder work on an ISA Trident?
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Re: What fit on the slot connector on ISA video cards

Postby vlask » 2016-11-27 @ 10:29

Photo from mine collection - with universal cable - unused connector is for these old type of cards....
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Re: What fit on the slot connector on ISA video cards

Postby SRQ » 2016-11-27 @ 10:53

That pic is so big I think I can see microns.
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Re: What fit on the slot connector on ISA video cards

Postby skitters » 2016-11-27 @ 20:00

Thank you for the answer and the detailed picture.
Probably not something I'd ever use, but it's interesting to know what it was for.
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Re: What fit on the slot connector on ISA video cards

Postby feipoa » 2016-11-27 @ 21:08

It is really too bad these MPEG cards weren't more widespread. I will probably never own any unless I make a concerted effort to look through the years.
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Re: What fit on the slot connector on ISA video cards

Postby sprcorreia » 2016-11-27 @ 22:19

feipoa wrote:
sprcorreia wrote:Other cards. I have a MPEG decoder card that uses that connector.

Interesting. Do you have a photo of it with specs? How well does the MPEG decoder work on an ISA Trident?


I need to grab it from storage. It is a Commodore card. Let me see if I have a picture around.
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Re: What fit on the slot connector on ISA video cards

Postby tayyare » 2016-11-28 @ 08:20

These are called "VGA feature connector" and supposed to be utilized by MPEG decoders, TV, and video capture cards. They came in two varieties:

Image

It was not only for ISA though, most of the PCI display cards that I've seen also had that connector.

I only owned one card that utilizes this connector in my entire life, which was a Creative MPEG decoder. I was a free grab from a recycler. I never able to make it work though.

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Re: What fit on the slot connector on ISA video cards

Postby spiroyster » 2016-11-28 @ 10:45

tayyare wrote:These are called "VGA feature connector" and supposed to be utilized by MPEG decoders, TV, and video capture cards. They came in two varieties:

VESA Feature Connector ;)

tayyare wrote:It was not only for ISA though, most of the PCI display cards that I've seen also had that connector.
I only owned one card that utilizes this connector in my entire life, which was a Creative MPEG decoder. I was a free grab from a recycler. I never able to make it work though.

Yes they were on PCI cards for quite a while (Voodoo3 has a working one, and even the Voodoo5 has one). However, even with the connector present, they didn't always actually work on all cards.

The only thing that I ever found requiring it is the Forte VFX1. It requires VESA conector on your gfx card so the VIP hooks straight into it and is the only way to display visual output to the HMD. When I first got my VFX1 (in 1999) I was gutted since my ATi Rage128Pro did not have a VESA feature connector, and I had to get a Matrox Millenium (quite a downgrade at the time), and a PC with ISA slots. Old stuff, even back then :dead:
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Re: What fit on the slot connector on ISA video cards

Postby tayyare » 2016-11-28 @ 14:25

spiroyster wrote:VESA Feature Connector ;)


Actually I knew it as "feature connector" only, but the web site that I found the picture to share from, misdirected me :blush: :

http://encyclopedia2.thefreedictionary.com/VGA+feature+connector
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Re: What fit on the slot connector on ISA video cards

Postby spiroyster » 2016-11-28 @ 16:04

tayyare wrote:
spiroyster wrote:VESA Feature Connector ;)


Actually I knew it as "feature connector" only, but the web site that I found the picture to share from, misdirected me :blush: :

http://encyclopedia2.thefreedictionary.com/VGA+feature+connector

'feature connector' yes your right, I've always known it as a VESA feature connector, but other sources (including wiki) seem to think just 'Feature Connector', however there is also an 80pin feature connector called 'VESA Advanced Feature Connector', so a distinction between 'VESA advanced feature connector' and just 'feature connector' is in order me thinks. :)

I wonder what the 80pin advanced feature connector is used for?
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Re: What fit on the slot connector on ISA video cards

Postby Jepael » 2016-11-28 @ 16:16

spiroyster wrote:I wonder what the 80pin advanced feature connector is used for?


Support for higher speeds, wider data buses and multiple devices.
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Re: What fit on the slot connector on ISA video cards

Postby spiroyster » 2016-11-28 @ 16:40

Jepael wrote:
spiroyster wrote:I wonder what the 80pin advanced feature connector is used for?


Support for higher speeds, wider data buses and multiple devices.

Any idea which devices?
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Re: What fit on the slot connector on ISA video cards

Postby j^aws » 2016-11-28 @ 17:29

spiroyster wrote:
Jepael wrote:
spiroyster wrote:I wonder what the 80pin advanced feature connector is used for?


Support for higher speeds, wider data buses and multiple devices.

Any idea which devices?

You can see the video daughterboard connected to the Advanced Feature Connector on this VLB graphics card, and alongside it is the unconnected normal Feature Connector:
DSC_0315.JPG

In addition, the daughterboard itself has added a bunch of other connectors, which I have no idea what purpose they serve...
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Re: What fit on the slot connector on ISA video cards

Postby Jepael » 2016-11-28 @ 19:33

spiroyster wrote:
Jepael wrote:
spiroyster wrote:I wonder what the 80pin advanced feature connector is used for?


Support for higher speeds, wider data buses and multiple devices.

Any idea which devices?


No, but try searching here: https://en.wikipedia.org/wiki/Feature_connector
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Re: What fit on the slot connector on ISA video cards

Postby vlask » 2016-11-28 @ 20:33

feipoa wrote:It is really too bad these MPEG cards weren't more widespread. I will probably never own any unless I make a concerted effort to look through the years.


I thought that noone is interested in these. Found some in previous years, but noone interested, so i donated them to fellow collector Palcal. He's not brave enought to throw them away. I've made even category for these onsite... http://vgamuseum.info/index.php/cards/itemlist/category/50-frame-grabbers-decoders
Not only mine graphics cards collection at http://www.vgamuseum.info
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Re: What fit on the slot connector on ISA video cards

Postby spiroyster » 2016-11-29 @ 07:51

Jepael wrote:No, but try searching here: https://en.wikipedia.org/wiki/Feature_connector

Yes, I mentioned in my first post in this thread, that the VFX1 is the only thing (ime) that requires the feature connector, I was wondering more specifically about the Vesa Advanced Feature Connector (the 80 pin one, not the 26 pin one).

Although given the timeline and the introduction of AGP, I suspect these 'VESA Advanced feature connectors' became redundant and I wonder if anything required the 80 pin connection. There is one on a Voodoo5 though so 3dfx obviously saw some merit in it ???
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Re: What fit on the slot connector on ISA video cards

Postby Anonymous Freak » 2016-11-29 @ 08:58

SRQ wrote:That pic is so big I think I can see microns.


No, those are Fujitsu DRAM chips, not Micron... :-D
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Re: What fit on the slot connector on ISA video cards

Postby elianda » 2016-11-29 @ 12:30

Early capture cards like the VideBlaster or Matrox IP8/AT use the VFC, later DVD decoder cards use often the VAFC.
Also companies like ATi introduced their own version called ATi Multimedia Channel (AMC) for e.g. the ATi TV Wonder Pro.
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