I was surfing through the DDJ Dev ISO archive and stumbled on this article from CUJ September 1990 which discusses X-Modem and variants in detail, with code listings. Thought some/many of you may be interested.
Well I can't attach it...
Heres the AA thread with some closeup photos: https://forums.atariage.com/topic/392360-atari-130xe-laptop-xebook-rev-4-upgrades-kits-possibility/
As a follow-up from our discussion on southern AMIS, I will be hosting the original AMIS BBS, which was the core for AMIS XE, starting over this weekend. The run will be 1-2 weeks depending on the level of interest. If you want to have a look at the BBS code, etc., here is the link to download AMIS. More information to follow on how to connect.
Wade - Here is the file: