Date   : Thu, 02 Jan 2014 12:08:59 +0000
From   : philb@... (Phil Blundell)
Subject: Modernisations

On Thu, 2014-01-02 at 12:50 +0100, Anders Carlsson wrote:
> A few years ago I bought one of those and while it does it job, it adds a 
> little delay on the picture. For your daily word processing, programming and 
> perhaps art drawing needs it might be acceptable, but you might find that 
> some action games will be more difficult to play if you see on screen what 
> is happening 0.2 seconds after the CPU decided it already happened. YMMV, 
> and the firmware and size of programmable chips may have improved to shorten 
> the lag.

That does sound like a surprisingly large amount of lag.  An external
scan converter probably will add one or two frames of latency, but your
0.2 seconds would be equivalent to 10 frames at 50Hz and it's hard to
imagine why that would be happening.

It probably wouldn't be all that hard to make a daughtercard to replace
the video ULA and provide an HDMI or DVI output directly.  You could
probably do that without introducing any appreciable output lag and I
imagine the resulting video quality would be a bit better.

p.