Sinclair QL Video Output

[Mark W. Smith]

From what I remember, the QL outputs TTL level RGB with Intensity, scanning around 15.75Khz.  Does anyone know of a way, such as a scan doubler so that I can use a modern day SVGA monitor with a QL.

 

Thanks in advance for the help.

 

Mark Smih

 

[g0mem]

"Mark W. Smith" <MSm...@optonline.net> wrote in message
news:vEu8a.654750$HG.122...@news4.srv.hcvlny.cv.net...

>From what I remember, the QL outputs TTL level RGB with Intensity, scanning
around >15.75Khz. Does anyone know of a way, such as a scan doubler so that
I can use a modern day >SVGA monitor with a QL.

There are a couple of VGA scan doublers that will take a composite or
S-video (separated Y-C). But I've never seen one that will take TTL RGB
separate Synch. The QL does not have an intensity (BRIGHT function). As the
QLs composite colour (monochrome is rock solid), is crap to say the least,
the results thru a VGA scan doubler would be very grim.

http://www.elm-chan.org/works/scanconv/report_e.html Something like this
homemade one could be adapted I suppose, but it's not cheap and the
construction is quite involved.

Suggest that the QL is best left rumming on a Microvitec CUB or similar.

Has anybody managed to get a Speccy to do RGB video??. Now this would be a
challange as there is no RGB video anywhere on the circuit board. The PAL
colour encoder is fed straight from the ULA with a R-Y and B-Y signal. Not
sure about the Amstrad Speccys though.

Mike Turner
G0MEM

[Marcus Durham]

In message <Ubv8a.674$zA....@news-binary.blueyonder.co.uk>, g0mem
<mikedt-remov...@vizzavi.co.uk> writes
[snip]

>Has anybody managed to get a Speccy to do RGB video??. Now this would be a
>challange as there is no RGB video anywhere on the circuit board. The PAL
>colour encoder is fed straight from the ULA with a R-Y and B-Y signal. Not
>sure about the Amstrad Speccys though.

My +3 had an RGB output.

--
Marcus Durham

[Mark W. Smith]

I just found my Sinclair QL Service Manual, and I need to correct my earlier post.  The QL video is Analog RGB with separate horizontal and vertical sync.  Therefore, I need a device to scan double from approximately 15Khz to 31Khz.  Does anyone know of such an animal.

 

Thanks in advance for your time.

 

Mark Smith

[g0mem]

"Marcus Durham" <Mar...@mdurham.co.uk> wrote in message
news:NBYXRoeC...@hones.co.uk...

Ah that's an Amstrad Speccy. I was thinking of the Sinclair (non-Amstrad)
flavour.

Mike Turner
G0MEM

[g0mem]

"Mark W. Smith" <MSm...@optonline.net> wrote in message

news:ikv8a.655506$HG.122...@news4.srv.hcvlny.cv.net...

>>>I just found my Sinclair QL Service Manual, and I need to correct my
earlier post. The QL video is Analog RGB with separate horizontal and
vertical sync. Therefore, I need a device to scan double from approximately
15Khz to 31Khz. Does anyone know of such an animal.

I got the QL service manual here, and it says RGB + synchs is TTL 0V - +5V
(active high). But both the colour and monochrome composites are analogue
75ohm.

The TTL RGB signals come straight from the ZX8301 ULA, and are split off
into a Motorola MC1377 PAL/NTSC encoder, which in turn provides the analog
composite outputs..

ftp://ftp.worldofspectrum.org/pub/sinclair/technical-docs/QLServiceManual.pd
f

[Duncan Snowden]

Program: g0mem

Bytes: Sunday

>>> Has anybody managed to get a Speccy to do RGB video??. Now this would
>>> be a challange as there is no RGB video anywhere on the circuit board.
>>> The PAL colour encoder is fed straight from the ULA with a R-Y and

>>> B-Y signal. Notsure about the Amstrad Speccys though.

>>
>> My +3 had an RGB output.
>
> Ah that's an Amstrad Speccy. I was thinking of the Sinclair
> (non-Amstrad) flavour.

The Sinclair 128 had RGB out (TTL + bright; maybe this is where Mark got
the idea that the QL had seperate bright output?). I don't know what it's
like, though - it's one of the things I Never Got Round To.

--
Duncan Snowden.

B Integer out of range, 760:5

[Mark W. Smith]

On 3/2/03 5:28 PM, in article lCv8a.4$80...@news-binary.blueyonder.co.uk,
"g0mem" <mikedt-remov...@vizzavi.co.uk> wrote:

Thanks so much for straightening me out. You are right, I was thinking of
my Spectrum 128K which has an Intensity bit. Nevertheless, I need to come
up with a solution to take the TTL level QL signals and scale them analog at
twice the horizontal scan rate.

I see some references to similar solutions for the Amiga 1200/4000 but can't
seem to get a hold of the specifics.

Thanks,
Mark

[g0mem]

"Duncan Snowden" <d...@ukonline.co.uk> wrote in message
news:Yam2NN.AmigaOS....@tnt-6-20.easynet.co.uk...

> The Sinclair 128 had RGB out (TTL + bright; maybe this is where Mark got
> the idea that the QL had seperate bright output?). I don't know what it's
> like, though - it's one of the things I Never Got Round To.

The trouble is a lot of TTL RGB monitors, like the Cub and CGA monitors
don't have a separate BRIGHT input. Not without modification anyway.

I did see some schematics for TTL RGB to analogue RGB converters. As most
TVs have analog RGB capability via the SCART connector.

Was the Amstrad CPC monitor analogue or digital??

Mike Turner
G0MEM

[Marcus Durham]

In message <y9J8a.16531$801....@news-binary.blueyonder.co.uk>, g0mem
<mikedt-remov...@vizzavi.co.uk> writes
[snip]

>Was the Amstrad CPC monitor analogue or digital??

Analogue.

--
Marcus Durham

[Dan]

My solution to use sinclair machines like 128, +2, +2A, +3, QL was
an Amiga 1084S monitor. It has TTL/Analog RGB inputs and works fine
with all sinclair machines (You can also connect your 48k to 1084 through a
fergurson RGB interface). You just need to build the appropriate cable.

Daniel Lúcio

"Mark W. Smith" <MSm...@optonline.net> wrote in message news:<vEu8a.654750$HG.122...@news4.srv.hcvlny.cv.net>...

> --