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[personal profile] jorallan
If you're not involved in the ZX Spectrum emulation scene, feel free to skip this post. In fact, it's probably best if you do. For avoidance of doubt, this views in this post are purely my personal views and are not intended to reflect the views of the Fuse team in any way.

Just about anyone who's been around the ZX Spectrum emulation scene in the past 18 months or so is probably aware of the ongoing saga of the Vega+ and its failure to be released. One of the allegations which has been made is that the emulator involved in the original Vega (not Plus) was in fact a rip-off of Fuse, and not the work of Chris Smith. This is frankly, complete rubbish, and I've told Retro Computers that in the past. While it's pretty easy for those of us who enjoy digging into t-state timings to spot the differences, there's actually one very easy way to tell: as part of Fuse's development, the team have developed a utility called "fusetest" which digs into a few dark corners of the ZX Spectrum's behaviour. The primary use of this tool is as a regression test to make sure that we haven't broken anything before doing a new release, but it can serve a secondary purpose of spotting differences between one emulator and another.

And what happens if you run fusetest on the Vega? Yep, you guessed it, it displays significantly different behaviour from Fuse - in particular, it fails the "floating bus" test in both 48K and 128K modes, and the "High port contention 2" test in 128K mode. You can see all this in this short video I made with my Vega.

Let's hope this puts to bed any further repetitions of this allegation.

Oh, and anyone playing silly buggers in the comments, either here or on YouTube, will discover that I can play quite well too.

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