mubase Posted January 22, 2015 Report Share Posted January 22, 2015 Hi guys. I have a Papilio one 500 with the Logicstart board which I love.Now I also have a ZX spectrum 48 computer which I love as well.I would like to know if it would be ossible in ANY WAY to use the Papilio One Logicstart to convert the output signal from the ZX Spectrum to VGA so I could plug my speccy into a VGA monitor instead of a TV.Is this possible?Can it be done ?Thanks.Steve. Link to comment Share on other sites More sharing options...
alvieboy Posted January 22, 2015 Report Share Posted January 22, 2015 Due to noise it is not possible to capture the YUV signals correctly. However, there's a trick... which is to use the expansion connector to eavesdrop on Address+Data lines in order to capture writes to the Spectrum framebuffer, and replicate the image internally. Actually, this is also part of a project I may start in March or April. Link to comment Share on other sites More sharing options...
Jack Gassett Posted January 22, 2015 Report Share Posted January 22, 2015 Here is a module that will convert YUV signals to RGB, but this was used for the A2601 project where the YUV signals were generated and hsync was as well. Like Alvie says, capturing the YUV signals is going to be hard to do, all of the commercial composite video to VGA converters I've ever used sucked... Jack. Link to comment Share on other sites More sharing options...
alvieboy Posted January 22, 2015 Report Share Posted January 22, 2015 Something among these lines: http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm Link to comment Share on other sites More sharing options...
james1095 Posted February 3, 2015 Report Share Posted February 3, 2015 Or implement the whole ZX Spectrum computer in the FPGA? I think it's already been done although I'm not aware of anyone having ported it to the Papilio yet. Link to comment Share on other sites More sharing options...
Jack Gassett Posted February 3, 2015 Report Share Posted February 3, 2015 Yes, It's out there for sure. I think this is the full thing here:http://opencores.org/project,zx_ula They got it running on the OpenBench Logic Sniffer which is another one of my boards, so almost on the Papilio. Link to comment Share on other sites More sharing options...
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