Look, to finally finish this speed question...
On my PC, I have a TI-8x Emulator. I have tried
various others, both good and bad, which produce
the same results.

An emulated z80 produces results twice faster than
the real calc, on a 450MHz K6-3.

So, how on earth is an M68k going to cope?? I
don't think they're quite as fast, or even a
third as fast, as a PC processor. Similar
emulation would be required, however.

Well, I WRITE Z80 emulator on TI89. Actually
it will emulate ZX Spectrum, popular Europe machine. It is still buggy, but some machine code routines can work. The result is that this 3.5 MHz machine works at about 50% of speed of the original when emulated on 10 MHz TI89. I have great expirience in ZX Spectrum emulators, and
used all possible optimization tricks.

I was just thinking about this... If one would like to speed up the emulation, one would use a binary tree for lookup of instructions. a linked list would be perfect for this.
Also, the 89/92+ has a workable window system. We could put the display in a window and it would look acceptable, with a modicum of coding. Doing this in TIGCC would be best (duh).

A simple jump table would be more efficient than a binary tree. To get almost full speed (assuming it is not fast enough with other easier tricks), dynamic translation could be used, which would still allow for self-modifying code. The emulated calculator would probably have to have a plain RAM file, because translating to the 68K structures would be dangerous (in terms of causing crashes) & slow. As for the screen image, I hacked a TI-81 ROM to run on a TI-86 emulator, which required mapping the screen in real time, & it turned out quite doable without any windowing support.

bullshit?

Someone needs to work on a program to emulate all of the ti calcs to work on any of them, so that once a program is made for one calc it would be able to be emulated for them all, and then many more games would be accessable for everyone. Maybe the emulator would only do the low 80's together, and the higher 80's, like the 89, and the 90's as a different group, because these groups are more similiar to each other, and would be able handle the same stuff at about the same speeds.

My thoughts exactly!

donde encuentro el emulador para las ti89\92

Está en Basics -> Calculators -> TI-89, en la sección «EMULATORS».

Well, emulating one procesor on another is quite a big deal. It would take alot of programming and would even on the 92, probably run slower than on the original calc. It is however, and pretty good idea that should be looked into. Not neccesarily done, but at least looked into.

-Dan

There are a few reasons why I think such a project
would be a relative waste of time.

The emulation of Z80 functionality would CRAWL.
The emulation of the original host environment
(memory mapped devices would have to be supported) would make the emulation package relatively large (and slower still.) As a result, the emulation wouldn't be suitable for real-time games. Bringing games over to a new calculator isn't a big problem; native games will appear soon enough, they seem to be 95% of what people write, anyway. If someone is itching to begin a project on the TI89, something like a pair of routines for huffman or arithmetic coding and decoding may be more useful.

[The text of this article has been removed by a news editor due to violation of the acceptable use policy.]

Were you belittled or something?

I really don't think that flaming is allowed by the people who run this site. Check the rules, and next time say something constructive.

I is itchin...
Port VTI! it is in c(++), and open source too!

I think that instead of an onboard emulator, somebody should make a recompiler to dissasemble and recompile the z80 code for 68K. Instead of using your calc's processing power and memory, use your computer's. Onboard calculator emulators/compilors are convenient, but not nearly as memory or speed efficient as computer programs. Forget all of that stuff about processing power and substituting commands; just do it on your PC.

THAT IS A GREAT IDEA AND I THINK THAT SHOULD BE DONE INSTEAD OF THE ON CALCULATOR EMULATOR!!!

I also agreed with this person. It would be much better to decompile the calc programs and recompile then for a different calc on a computer rather than take to time, hassle, and put up with the inevitable speed reduction that comes with using any emulator, not just this one (think about it: 200 mhz PC or a 10 mhz calc ;). It doesn't matter how much faster the processor is; it can only do so many operations per second.

I also think this is a good idea. But there should be a mac version too. If someone attempts this, try to find a mac programmer to make a simalar app.

Mac, of course. Mac's need some more stuff, I was thinking of making a TI-89 emulator for Mac, cause I can't seem to find one.

An easy way to avoid a lot of programming would be to compile TI8xEMU with a 68k C compiler making the necessary changes for the 89. I'm not saying it would run fast or anything. =)

Also, the size of the emulator is the least of the memory worries. The TI8x ROMs are. The TI-83 has a 256k ROM. That's like half of the 89's space.

No one is saying you need to have the actual ROMs, although it would help.
Being that the 89/92 has the mostly the same functions as the 8x, you could do more of a conversion type of thing, where it uses the 89 version of the function instead.

you would need it for rom calls