Thank you - this is quite a find. I remember banging my head against the limitations of the HIRES mode and eventually doing everything in text mode with redefined characters - I was working on a windowing system at the time.
Best thing in for summer was two weeks with my grand father, my Atmos and my monitor - and certainly not my mom telling me to get out in the sun (and my grand father couldn't care less.)
Great to encounter another Atmos fan on HN .. have you been following the OricExos project? Its a system consisting of 4 Oric's, tied together, sharing duties for graphics and sound .. pretty amazing hack, if I do say so myself:
Check out some of the demo's at the end of the thread .. it was recently booted up and demonstrated adding new color resolutions to the system. Truly mind-boggling!
http://www.defence-force.org/computing/oric/coding/part_7/in...
Here's more details on the attributes mode that, when properly grok'ed, gives us color options never before seen on the Oric:
http://thespider.oric.org/oric_hires_colour.html
Twilighte (RIP) exploited this extensively for his games - check out http://oric.org/ for his titles (they're in the top-10) ..
See also this thread:
http://forum.defence-force.org/viewtopic.php?f=14&t=875