"No settings, no nonsense" is the default for the MANY programs that exist to serve the "distraction free writing" niche.
General wisdom in author circles is that you write THEN edit. Having spell check and other tools only hampers the creative process.
Darkroom/WriteRoom (and the dozen+ similar programs created over the past decade or two) http://jjafuller.com/dark-room/ offer zero nonsense, zero setting, zero hassle, text entry programs geared towards authoring a book. They get rid of pretty much everything on screen except for text and background. No UI, no features, nothing. Just the way it should be.
I was mostly thinking along the lines of what if his machine dies? Instead of hunting around for old obsolete hardware it would be easier to find modern hardware that you've adapted to and configured to be as productive as your old hardware.
Because the newer stuff probably has at least a few features that will make him more productive in the long run, once he spends the initial time investment to configure the software for his needs.
There is a distinct possibility that modern word processors or text editors actually would be worth the transaction cost, as judged by Martin himself, even though he currently predicts otherwise.
he might, but what if he upgrades his OpenOffice and there's a fucking bug that turns spell-check back on? or upgrades OS X and it starts forcing autocorrect by default into ALL TEXT FIELDS, like his irc client.
my grandfather used a dos machine to manage the family's finances for years, and in the 90s i insisted, after learning BASIC on that machine, that he get with the times. though i was a linux enthusiast, i just bought him a cheapo emachines at best buy or wal-mart, which my entire family called to pitch in on later. because hey, nothing says happy birthday like diluting your nephew's first and only substantial gift to his stand-in father figure.
anyway, that was a mistake. the new spreadsheet was terrible and actually would not just create new rows like the old one, so after he died i had to go over to my grandmother's house and make a number of new rows that roughly corresponded - whether i liked it or not - to how long i thought she would live. i created rows all fucking day and she unfortunately did not, as far as i know, run out again.
that said, i think george r. r. martin should give a linux box with vga console a shot. without my dos experience, i'd probably never have learned to love the console.
For writing long novels on a machine not connected to the internet, upgrades of any kind are just a nuisance. Especially upgrades that require you to restart (this is a Windows machine, after all). The publisher will take care of special formatting, images, etc. Martin just needs to put words on paper without being interrupted and told how to do his job. I can understand his decision.