Ale: "The use of 2 "jump addresses" inside one long in the tables is quite smart."
That whole idea is not mine but down to Cusso. It was a very nice fit for the Z80 simulator. In that case having the op-code decoding mostly done in the dispatch tables gained a lot of speed and saved COG space. A lot of Z80 ops are never used (in the CP/M world anyway) so who cares if they get farmed out to slower overlays or LMM?
Just now it is not working so well for the 6809 where there are no ops we can ignore and the indexed addressing modes eat a lot of time and space to decode.
I have to say, just now I'm all burned out for this emulator business.
For me, the past is not over yet.