Here's the schematic I've been using.
VGA IN (male) on the left goes to the TT, and VGA OUT (female) on the right to your VGA cable.
This is "VERY" dependent on your monitors capabilities and most likely any problems with vertical lines etc are to do with phase/clock problems. Here's a web page with an extremely good writeup on what the kind of symptoms you'll see.
It essentially comes down to the HSYNC/VSYNC lines, putting out an oddball 1280x960 @ 72(ish)Hz and LCD's not being able to mimick the clocks correctly to reproduce the digital display from the incoming analog signal.
Scroll to the bottom of the page....http://www.lagom.nl/lcd-test/clock_phase.php
I was going to produce some boards, but it's so simple, but so varied on monitor output, it's best to publish and let others make it as they see fit.
PS. It's missing load capacitors on the IC's and power rails, but you get the idea.
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Falcon CT60, Falcon CT63 x2, TT x3, MegaST x2, MegaSTE x2, STFM x2, STE x2, STacy, STBook, (Dead) Hades 060, Milan 060, T40.