Bristol Digest, Vol 559, Issue 2

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Today's Topics:

1. Re: WinTV HVR-1100 (was 2 TV cards - can they work
together!?) (Amias Channer)
2. Re: WinTV HVR-1100 (was 2 TV cards - can they work
together!?) (David Smith)
3. Re: WinTV HVR-1100 (was 2 TV cards - can they work
together!?) (Alex Butcher)


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Message: 1
Date: Mon, 14 Jul 2014 16:11:28 +0100
From: Amias Channer <me@amias.net>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: Re: [bristol] WinTV HVR-1100 (was 2 TV cards - can they work
together!?)
Message-ID:
<CAMgU7XWZrUa1+QGcbiYf_8RhoVVfB+N-v-Y8mFFWBdR4py_HTw@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

On 14 July 2014 10:50, Alex Butcher <lug@assursys.co.uk> wrote:

> I vaguely remember that, in the mid-90s, some TV cards required an internal
> IDC ribbon cable to link to the VGA card. I've never needed that, however.
>

pretty sure that was phased out before dvb cards came around
most tv cards i've used just write directly into video memory (dma?)
with varying amounts of success , especially when compiz is used.

Cheers
Amias
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Message: 2
Date: Mon, 14 Jul 2014 15:23:53 +0000
From: David Smith <David.Smith@imgtec.com>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: Re: [bristol] WinTV HVR-1100 (was 2 TV cards - can they work
together!?)
Message-ID:
<15A9D35B5490FC49AC0524AE3A085F086A0920@BRMAIL01.br.imgtec.org>
Content-Type: text/plain; charset="us-ascii"

> -----Original Message-----
> From: bristol-bounces@mailman.lug.org.uk [mailto:bristol-
> bounces@mailman.lug.org.uk] On Behalf Of Alex Butcher
> I vaguely remember that, in the mid-90s, some TV cards required an internal
> IDC ribbon cable to link to the VGA card. I've never needed that, however.

I think that's from the days of VESA Local Bus (and possibly the early days of PCI). Once PCI came along and the TV tuner card was able to take mastership of the bus itself to write the image data directly to the graphics card via PCI without involving the host CPU, that cable was dropped.



------------------------------

Message: 3
Date: Mon, 14 Jul 2014 16:44:49 +0100 (BST)
From: Alex Butcher <lug@assursys.co.uk>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: Re: [bristol] WinTV HVR-1100 (was 2 TV cards - can they work
together!?)
Message-ID: <alpine.LFD.2.03.1407141643030.6307@nffheflf.pb.hx>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

On Mon, 14 Jul 2014, Amias Channer wrote:

>
> On 14 July 2014 10:50, Alex Butcher <lug@assursys.co.uk> wrote:
> I vaguely remember that, in the mid-90s, some TV cards required
> an internal
> IDC ribbon cable to link to the VGA card. I've never needed
> that, however.
>
>
> pretty sure that was phased out before dvb cards came around?

Yup, but Peter's card is a hybrid Analogue/DVB-T model. Obviously, even if
that is the purpose of that connector it would only be used for analogue, as
DVB-T decoding requires the host CPU (or some kind of outboard MPEG decoder,
anyway).

> most tv cards i've used just write directly into video memory (dma?)?

Yup, PCI bus master DMA.

> with varying amounts of success , especially when compiz is used.
>
> Cheers
> Amias

Best Regards,
Alex

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End of Bristol Digest, Vol 559, Issue 2
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