My First 405 output using PC - UK Vintage Radio Repair and Restoration Discussion Forum

Doctor Hue · 31st Dec 2013, 1:29 am

Hello,

This is my first post to this most interesting of sites.

Recently visiting Ally Pally has rekindled my interest in 405 TV.

I recently acquired a Sony 9-90UB which is working fine ( and also a Sony 9-306UB which is showing two images one above the other

? )

I still have my parent's Baird M708 Dual standard colour TV that they bought at Harrods in 1967. Any way following Kat Manton's ideas I have successfully
to-day got a 405 line picture out of my 9-90UB. I'm using a different mode line

of 704x384 @ 8M424 as I don't want to re-sample the horizontal and 384 vertical only needs two coefficients in my software interpolator . The original 405 spec seemed to have 385 active lines.

I did build a 525-625 field store/converter in the mid 1980's and a CCD 625/405 converter in the late 80's both of which are somewhere in my loft.

Now to improve it...

julie_m · 31st Dec 2013, 1:53 am

Interesting! Can you please post the important bits out of your xorg.conf file? I'd like to have a go at 405-line TV .....

llama · 31st Dec 2013, 10:04 am

Welcome to the forum!
Yes indeed that is great. As the owner of lots of old PCs (& some 405 line TVs) I'm tempted to have a go too. It would be great to have a click-by-click account of what to do.

From some of your "key-words" I presume you are using Linux. Starting from a hardware spec, up through installing an appropriate version of Linux and then the config and software would be fantastic.

It would also help some of us understand each step.
Graham

Nickthedentist · 31st Dec 2013, 3:07 pm

Welcome from me too! Love the VT-33E(?) as well.

N.

Doctor Hue · 1st Jan 2014, 1:33 pm

Thanks for the welcome guys.

Quote:

Originally Posted by ajs_derby

Interesting! Can you please post the important bits out of your xorg.conf file? I'd like to have a go at 405-line TV .....

See attached file that shows the monitor parts of my xorg file.

Quote:

Originally Posted by Nickthedentist

Welcome from me too! Love the VT-33E(?) as well. N.

Its actually an Hitachi VT-39EM Multi System PAL NTSC 3.58/4.43 Secam and MESecam

Quote:

Originally Posted by llama

Welcome to the forum!
It would be great to have a click-by-click account of what to do.
Graham

I'll try and post more details when I get a chance.

Refugee · 2nd Jan 2014, 4:30 am

I will keep an eye on this one for sure.
Where are you getting your base band video from on the computer?

Doctor Hue · 2nd Jan 2014, 10:46 pm

Quote:

Originally Posted by Refugee

Where are you getting your base band video from on the computer?

At the moment the computer has no video input. Video is from mp4 or
software 625(576) -> 405(384) interpolated images.

Jac · 3rd Jan 2014, 9:00 am

Looks impressive!

Jac

Refugee · 4th Jan 2014, 2:50 am

I was thinking of how you get the driver to work with a TV out card.

Doctor Hue · 4th Jan 2014, 11:47 am

Not quite sure if you mean hardware or software driver.

I used Kat Manton's sync combiner:

see forum page "FothTV (405-line from a PC) - KISS Circuit" and attached photo.

This is then feed into a VHS video input that then uses the VCR's UHF and 6MHz sound. The Sony 9-90UB will show 405 TV on UHF if both 405 & 625 buttons are pressed in together.

Combines Green, H & V.

Driver is standard Nvidia uses VGA connector and also use s-video into conventional 625 TV.

julie_m · 4th Jan 2014, 2:45 pm

Crocodile clips and component leads poked into the DIN socket!

That's the way to do electronics

Refugee · 5th Jan 2014, 7:35 pm

When I used to repair VGA screens. we used to get jobs in that were 60kHz line scan. We had a utility that ran a VGA card over the whole range from 15Khz to some very high frequency. I still have a copy with source code on one of the computers here.

On post XP computers it appears as a box that stretches and squeezes on the desktop and does not output the correct scans to the monitor. DOS or early Windows is needed.

31st Dec 2013, 1:29 am	#1
Doctor Hue Triode Join Date: Dec 2013 Location: Hertfordshire, UK. Posts: 35	My First 405 output using PC Hello, This is my first post to this most interesting of sites. Recently visiting Ally Pally has rekindled my interest in 405 TV. I recently acquired a Sony 9-90UB which is working fine ( and also a Sony 9-306UB which is showing two images one above the other ? ) I still have my parent's Baird M708 Dual standard colour TV that they bought at Harrods in 1967. Any way following Kat Manton's ideas I have successfully to-day got a 405 line picture out of my 9-90UB. I'm using a different mode line of 704x384 @ 8M424 as I don't want to re-sample the horizontal and 384 vertical only needs two coefficients in my software interpolator . The original 405 spec seemed to have 385 active lines. I did build a 525-625 field store/converter in the mid 1980's and a CCD 625/405 converter in the late 80's both of which are somewhere in my loft. Now to improve it... Attached Thumbnails

31st Dec 2013, 1:53 am	#2
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: My First 405 output using PC Interesting! Can you please post the important bits out of your xorg.conf file? I'd like to have a go at 405-line TV ..... __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.

31st Dec 2013, 10:04 am	#3
llama Octode Join Date: Jun 2006 Location: St Osyth, Nr Clacton, Essex, UK. Posts: 1,482	Re: My First 405 output using PC Welcome to the forum! Yes indeed that is great. As the owner of lots of old PCs (& some 405 line TVs) I'm tempted to have a go too. It would be great to have a click-by-click account of what to do. From some of your "key-words" I presume you are using Linux. Starting from a hardware spec, up through installing an appropriate version of Linux and then the config and software would be fantastic. It would also help some of us understand each step. Graham __________________ Half my stuff is junk - trouble is, I don't know which half!

31st Dec 2013, 3:07 pm	#4
Nickthedentist Dekatron Join Date: Jan 2005 Location: Oxford, UK. Posts: 17,861	Re: My First 405 output using PC Welcome from me too! Love the VT-33E(?) as well. N.

2nd Jan 2014, 4:30 am	#6
Refugee Dekatron Join Date: Apr 2012 Location: Worksop, Nottinghamshire, UK. Posts: 5,554	Re: My First 405 output using PC I will keep an eye on this one for sure. Where are you getting your base band video from on the computer?

3rd Jan 2014, 9:00 am	#8
Jac Heptode Join Date: Jun 2006 Location: Eindhoven, Netherlands. Posts: 642	Re: My First 405 output using PC Looks impressive! Jac

4th Jan 2014, 2:50 am	#9
Refugee Dekatron Join Date: Apr 2012 Location: Worksop, Nottinghamshire, UK. Posts: 5,554	Re: My First 405 output using PC I was thinking of how you get the driver to work with a TV out card.

4th Jan 2014, 11:47 am	#10
Doctor Hue Triode Join Date: Dec 2013 Location: Hertfordshire, UK. Posts: 35	Re: My First 405 output using PC Not quite sure if you mean hardware or software driver. I used Kat Manton's sync combiner: see forum page "FothTV (405-line from a PC) - KISS Circuit" and attached photo. This is then feed into a VHS video input that then uses the VCR's UHF and 6MHz sound. The Sony 9-90UB will show 405 TV on UHF if both 405 & 625 buttons are pressed in together. Combines Green, H & V. Driver is standard Nvidia uses VGA connector and also use s-video into conventional 625 TV. Attached Thumbnails

4th Jan 2014, 2:45 pm	#11
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: My First 405 output using PC Crocodile clips and component leads poked into the DIN socket! That's the way to do electronics __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.

5th Jan 2014, 7:35 pm	#12
Refugee Dekatron Join Date: Apr 2012 Location: Worksop, Nottinghamshire, UK. Posts: 5,554	Re: My First 405 output using PC When I used to repair VGA screens. we used to get jobs in that were 60kHz line scan. We had a utility that ran a VGA card over the whole range from 15Khz to some very high frequency. I still have a copy with source code on one of the computers here. On post XP computers it appears as a box that stretches and squeezes on the desktop and does not output the correct scans to the monitor. DOS or early Windows is needed.