Oh yes, you're right! I'd forgotten some of how things got finalized. I started using the Atari 520ST with pre-release CP/M-68K docs and software before settlin

Oh yes, you're right! I'd forgotten some of how things got finalized. I started using the Atari 520ST with pre-release CP/M-68K docs and software before settling on GEMDOS/TOS. It was all in a bad state with a literal stack of paper given to me (rather than electronic docs) that only roughly corresponded to the state of the software so must have been in flux. Even the GEM parts were still being worked out. I recall using just the "Line-A"[0] graphics calls which were I believe 000a traps that were ROM calls to routines before getting access to higher level GEM graphics support. There's mention of CP/M-68K and TOS with info on the Atari 130ST/260ST[1] (which also happened to have 512KB). I do recall later getting the OS in ROM of later hardware so boots were quicker. [0] http://toshyp.atari.org/en/006001.html http://toshyp.atari.org/en/006001.html [1] https://www.old-computers.com/museum/computer.asp?c=922 https://www.old-computers.com/museum/computer.asp?c=922