I write exclusively using computers. Pens and typewriters can fsck right off — I wrote my first half million words in my teens on a manual typewriter (had to trade it for a new one due to keys snapping from metal fatigue) so I am not a pen or typewriter fetishist.
I write almost entlirely on Macs, because: Windows gives me hives. (I first ran into Windows as of Win 2.11/386, back in the eighties. It did not leave a good taste. I then became a happy UNIX bunny. Mac OSX is the last UNIX workstation class OS standing. So I’ve learned to put up with its other foibles.)
I have no set writing routine other than: plant bum in chair in front of keyboard/on sofa under laptop, and start going. Oh, and I drink tea pretty much continuously at a rate of around 1 imperial pint/hour, which sort of enforces screen/keyboard breaks.
Whoa, that sounds like my approach. I’m also sitting here with a cup of tea that I rise up regularly to refill, and also to, errm, release the Kraken. He must be a smart man.