Absolutely superb, very well done - master piece actually given the limitation of the hardware... You are a true programming sorcerer! And you've made the 13 year old boy in this late 40s man very happy. And plays fantastic using a DivMMC and my grey +2 Spectrum from my childhood. Even with just one fire button, which I thought would limit its play-ability, but absolutely not - vertical and horizontal axis for punches, diagonal axis for kicks and sweeps - perfect! The controls are exactly how it should have always been mapped in my view for one button controllers. Thoroughly enjoyable - and a game I wanted for my Spectrum back in the day... And the in game music, the fact its there - just wow. Very well done - pure magic of the strongest kind :) Thank you.
Sorry I forgot to mention it, as you requested it, I am using a DivMMC Future with my +2. I think SF2 came out early 1993 for the Spectrum ZX from memory, and it coincided with the end of the Spectrum's commercial life really. The port of SF2 is like the metaphorical equivalent of getting Doom working an Amiga - its the same 'nemesis'/ seismic changing game really ending one era and starting another in my view. So the fact you got it working so beautifully is truly wonderful & amazing. And the beautiful paradox about it being 33 years later. Back in the day as a child I wanted the home port to be identical to the arcade. Now I'd play a good port on my +2 over the arcade any day of the week, because its anchored in childhood with some wonderful memories playing on my Spectrum :) That and I like seeing the impossible done by supremely talented folks like yourself ;-)