Hi,
Sorry for not replying sooner, I have been busy in the workshop. The first part of my GBS-82XX experiments has now been written up:
http://ianstedman.wordpress.com/gbs-82xx-experiments/
@dooklink
Welcome to EAB,I hope you enjoy your time here.
I have a Raspberry Pi so I might try your scripts soon. Good work in decoding the TVIA-5725 datasheet, it's not an easy read.
If you want to discuss some ideas or want a second opinion on things, please contact me. I've been playing with video systems professionally for 8 years now.
What systems do you connect the GBS-82XX to?
@higgy
Read my blog post and try the revised sync circuit.
Ian