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When I'm out doing astro photography with my laptop (portable setup) I require:
6 x USB (not all USB 2.0)
1 x RS232 (I actually use 2, but use a converter for one)
And it's only going to get worse.
So for me, knowing that I will need 2 RS232's I'd have as a requirement (unless absolutely impossible) 1 RS232, just to ease the load on the USB and save clutter if nothing else. And the more USB's built in the better - the less clutter with hubs etc.
LPT would also be very high on the list, there are a lot of camera's & devices that still use it. From modified webcams to home made stepper motor kits for focusing.
Good battery life would be high on the list too, even though I use a SLA would be convenient to have more than the 1-2 hours I currently have.
Good brightness & contrast controls on the LCD would be nice too.
Roger.
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