https://www.hpmuseum.org/forum/thread-18537-post-208338.html#pid208338apart from sharp pockets (and basic) plus also psion OPL thing and transpilations with SinclairQL SMSQ S*Basic (the best one), all for vmex/aslix simulation , slow but tweakable, something to play with, I have strong bond with TI-66 device, so, we are trying to find what's aactually inside T6875 and how to inject external clock and something instead of SRAM ...
Petr