yell0w_lantern Posted October 2, 2018 Share Posted October 2, 2018 I can't for the life of me get the picture to stop rolling and show up reliably using the GBS 8220.Just linking H-sync and V-sync did not work. Using only H-sync did not work. There's no modulator so no C-sync over pin 2. I've read about AND, OR, and XOR gates as possibilities. Has anyone here gotten an earlier production 520ST working with the 8220? If so, what did you do? Did you use a logic gate of some kind? Thank you in advance. Quote Link to comment Share on other sites More sharing options...
vattari Posted October 2, 2018 Share Posted October 2, 2018 I was able to use a 74HC86 Quad 2 Input XOR IC to generate a composite signal for the GBS-8220 from my Mega ST, passing in the H and V Sync. Quote Link to comment Share on other sites More sharing options...
yell0w_lantern Posted October 3, 2018 Author Share Posted October 3, 2018 I was able to use a 74HC86 Quad 2 Input XOR IC to generate a composite signal for the GBS-8220 from my Mega ST, passing in the H and V Sync. Thank so much, vattari, the XOR did it! So ends 2 weeks of frustration! Time to get my floppy emulator warmed up. 1 Quote Link to comment Share on other sites More sharing options...
vattari Posted October 3, 2018 Share Posted October 3, 2018 Good to hear! I’m sure you’ll find the Goteks are more straight forward Sent from my iPad using Tapatalk Quote Link to comment Share on other sites More sharing options...
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