iBM definitely!
I've been using a T42 for the last few months, came with the job. It's an excellent machine. Powerful but light weight
I've just been upgraded to a T61, 2GHz dual core CPU, 2 GB memory, 120GB disk, 15" screen. Very nice indeed.
I haven't tried using either for astronomy, I do have my own R50P with Windows installed which I've used to connect to an Argo Navis and a motor drive with some success.
I've used a USB -> serial converter but I'd recommend a real serial port via a PCMCIA card.
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