Smokeless Joe Posted August 8, 2016 Share Posted August 8, 2016 Short story: When connecting a VBXE, is the CSYNC from pin 15 of CD4050 powered? If so, how many volts? Long story: I'm trying to connect a VBXE to a Framemeister. I've rigged a cable, but it gives a crappy picture. So I'm looking at: https://www.retrogamingcables.co.uk/european-scart-to-framemeister-xrgb-mini-converter-with-csync-lm1881-for-sale?search=Framemeister That looks cool. I've got plenty of SCART cables so I should be set. However it "Requires a EuroSCART cable which is wired for either 5 volts or 12 volts on pin number 8 of the SCART plug. This is needed to power up the LM1881 video sync separator circuit and without this required voltage you will not get a picture on your Framemeister." So... will pin-15 of CD4050 connected to SCART pin-8 give me the 5 or 12 volts I need? Also, in the VBXE installation instructions for using a SCART cable, nothing is hooked up to pin 8. What's up with that? Thanks, - Joe Quote Link to comment Share on other sites More sharing options...
JoSch Posted August 8, 2016 Share Posted August 8, 2016 Well, Wikipedia (https://en.wikipedia.org/wiki/SCART) states that PIN 8 is the aspect ratio selector. So VBXE doesn't care. I don't know about pin 15, but should be finding plenty sources for 5V in the Atari, e.g. Pin 1 of the CD4050 is VDD, and should be 5V. Quote Link to comment Share on other sites More sharing options...
Rybags Posted August 8, 2016 Share Posted August 8, 2016 CSync is a 5V signal at the pin of the 4050. But generally you wouldn't rely on it to power anything significant. You'd probably need to check the datasheet but the current is probably in the order of 10 or less mA. Also, CSync although active low (so mostly in high state) does stay low for most of the 3 scanlines of VSync. CSync on the Atari is XOR of HSync and VSync. 1 Quote Link to comment Share on other sites More sharing options...
flashjazzcat Posted August 8, 2016 Share Posted August 8, 2016 Also, in the VBXE installation instructions for using a SCART cable, nothing is hooked up to pin 8. What's up with that? See page 15 of the installation guide: http://www.lotharek.pl/zasoby/produkty/82/pliki/vbxe_installation_manual.pdf VBXE RGB control is connected to SCART pin 16 (BLNK) to turn on RGB mode. The note at the bottom of the page explains the situation with pin 8, and according to the SCART spec only 1-3v is required for RGB. I haven't measured the voltage coming off VBXE's RGB switch pin, but I don't think you'd want to power anything off that either. Quote Link to comment Share on other sites More sharing options...
Smokeless Joe Posted August 8, 2016 Author Share Posted August 8, 2016 Okay, sounds like I'll need to get the connector that has the supplemental power source. Thanks! Quote Link to comment Share on other sites More sharing options...
Frankie Posted August 9, 2016 Share Posted August 9, 2016 I was looking at using a framemeister from my vbxe but used something else. If I had though i would have connected it with a db9 plug and used a db9 to db15 VGA cable I purchased. Why did you chose the scart cable? Quote Link to comment Share on other sites More sharing options...
Smokeless Joe Posted August 9, 2016 Author Share Posted August 9, 2016 I haven't used a SCART cable yet. I just have a lot of them lying around, and the linked adapter in my first post looks like a nice, professionally made option. I've connected an Apple IIGS RGB out to the Framemeister and it looks beautiful, but I had to rewire the cable to work with the included JP21 adapter. A SCART adapter would make things a little easier. The Framemeister doesn't have a VGA input, at least mine doesn't. I tried a VBXE DB9 out, but the image looked awful. It was all blurry and washed out. Clearly I did something wrong, so I wanted to try the SCART out option. Quote Link to comment Share on other sites More sharing options...
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