carousels was 6 pen or 8 pen. Other than that, they all appear to be the same? Maybe they're the next big thing I don't know. You'd sure get that impression looking at the eBay listings. I payed 5$ for my largish IBM 7374?. No carousel though. I've never actually run it, but it powers up and all, though reports an error after a bit ***Need docs***. I plan on machining/fabricating a carousel. You really don't need one someone pointed out, for circuit board work, or really anything, so long as you're willing to manually change pens. ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.2899 / Virus Database: 2641/6130 - Release Date: 02/25/13 ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.2899 / Virus Database: 2641/6130 - Release Date: 02/25/13