I have a working vt240 under MAME. ¿When you press F3 the emulation is restarted? ¿Do you like to test with another ROM image? Gus
El vie., 3 de jul. de 2020 a la(s) 11:44, Gustavo Del Dago ( [email protected]) escribió: > Peter, > ¿Can you access the configuration screen after pressing F3? > > "More power to whoever wants to do this. Let's help them instead of > explaining why it is useless." > +1 > > Gus > > El vie., 3 de jul. de 2020 a la(s) 10:24, Johnny Billquist ([email protected]) > escribió: > >> On 2020-07-03 14:54, Lars Brinkhoff wrote: >> > Johnny Billquist wrote: >> >>> Oh, and just for the people who don't want to read a lot of >> >>> documentation, the smooth scrolling is essentially done by the >> >>> terminal by changing where the source of the video signal generation >> >>> picks up font information [...] >> >>> I hope that made sense... :-) >> > >> > Thanks, I think it does. >> > >> > Emulation at this level of detail really isn't that uncommon now. >> >> I can't say that I've seen much of it anywhere. The VT100 also have a >> lookup table for each line, so that scrolling can be done fast, but >> which also means that the video generation needs to also go through that >> table. While obviously you can always emulate anything, the emulating of >> detail down to analog signals is not something you do that often, unless >> there is additional reasons to. One reason being that this starts >> becoming a performance problem. Many analog simlulations/emulations are >> not done in realtime because of that. >> >> But if we want to emulate a terminal, I would say that realtime >> emulation of the hardware is a must. >> >> And it's easy to just do it partially. You do have the video memory, and >> for most purposes that would be good enough for the emulation to work >> satisfactory, a thing like the smooth scrolling means you no longer can >> stop at the abstraction of the video memory... >> >> >> And to take this one step further. Emulation of this then means you >> >> need to start emulation the video signal generation. And that in turn >> >> means you are going to do emulation of the CRT phosphor. >> > >> > I have no idea how MAME works, but SIMH does that for vector displays. >> >> Well, MAME also do vector displays. Asteroids being the classical example. >> >> > The current implemenation may not be suitable for raster displays, but >> > it wouldn't be a huge step to add this. >> >> At some level this is obviously rather trivial. We are after all simply >> talking about generation of a signal based on the scanning of memory, >> and a bit of logic to do the sweeps and sync. An interesting question >> becomes at what speed it can be done. Vector displays have a limit on >> the number of vectors that can be displayed without flicker, and for the >> old machines, that was not too great to start with, so simulations can >> certainly deal with it, and can even get away with some cheating to make >> it work even when pressed. After all, since you're also faking the >> phosphor decay, it can be varied as needed. With a raster display >> though, you need to be doing all the lines all the time, at an >> acceptable rate, and deal with the additional hardware logic of the CRT. >> >> Again, definitely not impossible. But I'm curious what the speed would >> look like, and I cannot remember seeing anyone who have already done it. >> >> Johnny >> >> -- >> Johnny Billquist || "I'm on a bus >> || on a psychedelic trip >> email: [email protected] || Reading murder books >> pdp is alive! || tryin' to stay hip" - B. Idol >> _______________________________________________ >> Simh mailing list >> [email protected] >> http://mailman.trailing-edge.com/mailman/listinfo/simh > >
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