On Wed, Aug 31, 2011 at 12:32 PM, Dilwyn Jones <[email protected]> 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
