Most of the "C" models (64C, 1541C, and the 1541-II) were bundled with GEOS 1.x. GEOS 2.0 was a power-user purchase. IIRC, there was a 64C and disk drive (either the 41-II or 41C) sold in a bundle with GEOS. And of course, let's not forget all of the copies of QLink included as well!
Looking through the article... ahhh GeoCalc. I was just commenting on some of the things I did in that program way long time ago. I can't wait until I buy my new house so I can set up my computer room again.
Oh, and I remember the "Sky Tray." Or at least I remember reading about it, maybe it was in COMPUTE!. hehehe back to bed, darnit!