On 14 July 2016 at 20:50, Chuck Guzis <ccl...@sydex.com> wrote: > > Everyone seems to forget about the work-alikes, such as TPM for the > Epson QX-80.
True. And there was Pro DOS for the SAM Coupé: http://www.samcoupe-pro-dos.co.uk/ ZCN for the Amstrad NC series: https://www.ncus.org.uk/fnov00.htm And probably others. > GEM for the Atari ST is essntially a clone of MS-DOS functionality for > the 68K with a graphics enhancement tacked on. Yet I've never heard any > accusations that DRI "pirated" MS-DOS. Not GEM as such -- it's the GUI layer. But ST GEM ran on a kernel called GEMDOS, which was a sort of hybrid of CP/M-68K and DR-DOS: a 68000 kernel but with MS-DOS like API compatibility. Written by DR and licensed from them by Atari. So, a better comparison would be DR-DOS. I think nobody ever claimed that DR stole MS-DOS source code, though. It was clean-room reverse-engineered, and had some different internal data structures, which manifested in a (very very few) compatibility problems. However, the accusation is that MS -- or SCP -- did actually use CP/M source code in creating QDOS. It's not that QDOS' design was copied from CP/M, which it was -- that's already been admitted. It's that QDOS contained appropriated CP/M source from DR. -- Liam Proven • Profile: http://lproven.livejournal.com/profile Email: lpro...@cix.co.uk • GMail/G+/Twitter/Flickr/Facebook: lproven MSN: lpro...@hotmail.com • Skype/AIM/Yahoo/LinkedIn: liamproven Cell/Mobiles: +44 7939-087884 (UK) • +420 702 829 053 (ČR)
