Re: [Ql-Users] Video plug memory prod...
Ah Ha I know this mod, search the web for this tinker on a Spectrum or ZX Spectrum it should be found easily enough (I can't do it during the day as BB is watching). If I remember rightly the at the end of the article/item it suggest that the same mod could be done on a QL or any computer with this same modulator. From memory I think a decoupling capactior was used (there may be a couple of resistors in there to correct voltage levels i.e. PD, but I may be mixing that up with the SCART adaptation). Hope this helps, Lee On Wed, Aug 31, 2011 at 7:02 PM, Dave Park plasticu...@gmail.com wrote: On Wed, Aug 31, 2011 at 12:32 PM, Dilwyn Jones dil...@evans1511.fsnet.co.uk wrote: Dave Park wrote: I have heard there is a simple colour composite video mod but after extensive googling I have not found it. Does anyone have details of this mod, to get me through until I can locate a working old school TTL RGB monitor? I have restarted work on a couple of games I was writing before the heatwave and drought made it too pleasant to be outside ;) There are a couple of articles by Richard Cooke, Marcel Flipse and Bob Gilder on my website at http://www.dilwyn.me.uk/docs/hardware/index.html which show various calculations required for video mods for various types of monitor. Does your TV have a RGB SCART input? Richard Cook's article might help to work out making Have a look at this too (again a suggestion from Lee): http://www.fruitcake.plus.com/Sinclair/Spectrum128/SCARTCable/Spectrum128SCARTCableQL.htm There is also a British company JS Technology who do a little RGB to TTL video converter which has been tweaked for QL overscan etc. Lee Privett has one of their little video scalar boxes and there is an article about it in Quanta magazine June/July 2011 issue. See their website http://www.js-technology.com/store/category.php?id_category=5 Hope something there helps... :-) Dilwyn Jones Alas, I am in the US and have a US QL. There is no such thing as SCART over here. I read that the composite mod is simply disconnecting power to the modulator and connecting the composite input to the center pin of the output. This will work well for mode 8, but not so well for mode 4 due to color timings. In a US QL it would also be very noisy due t the QL ground being so noisy. Also, I'm not sure I will be able to see all the screen area. I think I am destined to buy the RGB-VGA converter board for $39.95 as one of the programs I am writing does not fit well with mode 8. Oh well, back to building my home-made floppy enclosure... Dave ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
Re: [Ql-Users] Video plug memory prod...
On Sun, Aug 28, 2011 at 4:07 PM, Dave Park plasticu...@gmail.com wrote: On Sun, Aug 28, 2011 at 2:05 AM, Jiri Dolezal computer.resea...@centrum.cz wrote: Is a standard 7-pin DIN connector as used for MIDI Midi? Standard MIDI connector is 5 pin/180 degrees. suitable for the QL video socket? I want to make a composite video cable... QL video socket is 8 pin. For composite video, 3 pin DIN will be OK (uses only 2 pins), but for RGB, you need one pin in the centre for blue (vhich 7 pin DIN has not). ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm I can feed an LCD TV with a composite video signal, but it won't scan 15KHz RGB AFAIK... I'm just trying to work out the correct plug as I found numerous different angle spacings of DIN socket, and am not sure which ones'll line up so I can do the composite pins. Dave I have heard there is a simple colour composite video mod but after extensive googling I have not found it. Does anyone have details of this mod, to get me through until I can locate a working old school TTL RGB monitor? I have restarted work on a couple of games I was writing before the heatwave and drought made it too pleasant to be outside ;) Dave ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
Re: [Ql-Users] Video plug memory prod...
Dave Park wrote: I have heard there is a simple colour composite video mod but after extensive googling I have not found it. Does anyone have details of this mod, to get me through until I can locate a working old school TTL RGB monitor? I have restarted work on a couple of games I was writing before the heatwave and drought made it too pleasant to be outside ;) There are a couple of articles by Richard Cooke, Marcel Flipse and Bob Gilder on my website at http://www.dilwyn.me.uk/docs/hardware/index.html which show various calculations required for video mods for various types of monitor. Does your TV have a RGB SCART input? Richard Cook's article might help to work out making Have a look at this too (again a suggestion from Lee):http://www.fruitcake.plus.com/Sinclair/Spectrum128/SCARTCable/Spectrum128SCARTCableQL.htm There is also a British company JS Technology who do a little RGB to TTL video converter which has been tweaked for QL overscan etc. Lee Privett has one of their little video scalar boxes and there is an article about it in Quanta magazine June/July 2011 issue. See their website http://www.js-technology.com/store/category.php?id_category=5 Hope something there helps... :-) Dilwyn Jones ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
Re: [Ql-Users] Video plug memory prod...
Is a standard 7-pin DIN connector as used for MIDI Midi? Standard MIDI connector is 5 pin/180 degrees. suitable for the QL video socket? I want to make a composite video cable... QL video socket is 8 pin. For composite video, 3 pin DIN will be OK (uses only 2 pins), but for RGB, you need one pin in the centre for blue (vhich 7 pin DIN has not). ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
Re: [Ql-Users] Video plug memory prod...
On Sun, Aug 28, 2011 at 2:05 AM, Jiri Dolezal computer.resea...@centrum.cz wrote: Is a standard 7-pin DIN connector as used for MIDI Midi? Standard MIDI connector is 5 pin/180 degrees. suitable for the QL video socket? I want to make a composite video cable... QL video socket is 8 pin. For composite video, 3 pin DIN will be OK (uses only 2 pins), but for RGB, you need one pin in the centre for blue (vhich 7 pin DIN has not). ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm I can feed an LCD TV with a composite video signal, but it won't scan 15KHz RGB AFAIK... I'm just trying to work out the correct plug as I found numerous different angle spacings of DIN socket, and am not sure which ones'll line up so I can do the composite pins. Dave ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
[Ql-Users] Video plug memory prod...
Is a standard 7-pin DIN connector as used for MIDI suitable for the QL video socket? I want to make a composite video cable... Dave ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
Re: [Ql-Users] Video plug memory prod...
At 16:40 27/08/2011 -0500, you wrote: Is a standard 7-pin DIN connector as used for MIDI suitable for the QL video socket? I want to make a composite video cable... Dave, Yep, 6oclock common 3 9 oclock mono colour, not sure which round ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
