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Author Topic: Jazz: JavaScript TI-83 Plus emulator  (Read 10334 times)

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Offline Deep Toaster

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Jazz: JavaScript TI-83 Plus emulator
« on: September 16, 2011, 10:42:40 pm »
As some of you may know, I've decided to take on the project of a full TI-83 Plus emulator written in JavaScript. In other words, it'll be a webapp calculator that anyone could pull up whenever they're on a computer that's online.

First, I did the reality checks. There have been emulators in JavaScript already, including Two9A's and Pedro Ladaria's GameBoy emulators (with a GBZ80 engine) and JSSpeccy, which uses a true Z80. The other major constraint is memory, and Eeems checked that for me with a benchmark too that shows that most browsers can handle far more than the 2 or so megabytes needed to emulate a TI-84 Plus. So it's definitely possible.

I finally started working on it today. It's located at http://clrhome.tk/resources/jazz/, where I'll be testing individual instructions until I get all of them down. Right now it only has ADC (I'm working through the alphabet), but I'd really appreciate it if people who know ASM could help play around to see if all the flags are being emulated correctly. And if any of you with ASM and JS experience wants to help, please tell me! :)
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Offline DrDnar

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Re: Jazz: JavaScript TI-83 Plus emulator
« Reply #1 on: September 16, 2011, 10:45:55 pm »
Check out http://z80.info/ for lots of information about the Z80. There's the Zilog Z80 CPU user manual (PDF) that describes every instruction (though it has errors), as well as articles about undocumented instructions. Pretty good resources.
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Offline Deep Toaster

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Re: Jazz: JavaScript TI-83 Plus emulator
« Reply #2 on: September 16, 2011, 10:51:18 pm »
I use that all the time, and even got 28D listed on the page :)
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Offline Eeems

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Re: Jazz: JavaScript TI-83 Plus emulator
« Reply #3 on: September 16, 2011, 10:58:34 pm »
Btw, my benchmark script is now located on http://eeems.omnimaga.org/Files/benchmark.html if you want to be able to access it when my laptop is not online :P
I'm really looking forward to this :) Let me know if you need any help with anything at all, I'll be happy to provide whatever assistance I can :)
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Offline ralphdspam

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Re: Jazz: JavaScript TI-83 Plus emulator
« Reply #4 on: September 16, 2011, 11:37:57 pm »
Sounds like a great idea!  I would love to use a TI-83 Plus emulator on a public computer.  :)

What are you going to do about the copyrighted OS, though?
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Offline Juju

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Re: Jazz: JavaScript TI-83 Plus emulator
« Reply #5 on: September 17, 2011, 02:38:25 am »
Yeah sounds like a great idea. Can't wait to see this.

I guess the page would ask for an OS file.
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Offline Netham45

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Re: Jazz: JavaScript TI-83 Plus emulator
« Reply #6 on: September 17, 2011, 02:42:07 am »
Make it take a URL for an image too, so we can keep one on our servers so we don't have to have one on our phones, etc...
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Offline Builderboy

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Re: Jazz: JavaScript TI-83 Plus emulator
« Reply #7 on: September 17, 2011, 05:21:40 am »
I mirror the question about how you are going to manage to bypass the OS copywrite issue o.O
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Offline Lionel Debroux

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Re: Jazz: JavaScript TI-83 Plus emulator
« Reply #8 on: September 17, 2011, 07:26:57 am »
Users will somehow have to provide the OS image to the emulator.

With the powerful JIT engines built into the JS interpreters of modern browsers, JS is fast enough for emulating a PC running Linux: http://bellard.org/jslinux/ . Therefore, a 83+ emulator ought to be doable in JS :)
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Offline Deep Toaster

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Re: Jazz: JavaScript TI-83 Plus emulator
« Reply #9 on: September 17, 2011, 10:00:47 am »
Yeah, you'll have to somehow provide the image yourself. I'll definitely have it support saving ROMs too.
Quote from: Lionel Debroux on September 17, 2011, 07:26:57 am
With the powerful JIT engines built into the JS interpreters of modern browsers, JS is fast enough for emulating a PC running Linux: http://bellard.org/jslinux/ . Therefore, a 83+ emulator ought to be doable in JS :)
That is amazing.
« Last Edit: September 17, 2011, 10:12:09 am by Deep Thought »
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Offline Xeda112358

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Re: Jazz: JavaScript TI-83 Plus emulator
« Reply #10 on: September 17, 2011, 10:03:42 am »
... Unless we use a community created OS... :D This sounds really cool! I won't need to use windows calculator anymore :D
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Offline apcalc

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Re: Jazz: JavaScript TI-83 Plus emulator
« Reply #11 on: September 17, 2011, 11:38:11 am »
This sounds very interesting!  I look forward to seeing future progress! :)
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Offline Eeems

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Re: Jazz: JavaScript TI-83 Plus emulator
« Reply #12 on: September 17, 2011, 02:53:18 pm »
Quote from: Lionel Debroux on September 17, 2011, 07:26:57 am
Users will somehow have to provide the OS image to the emulator.

With the powerful JIT engines built into the JS interpreters of modern browsers, JS is fast enough for emulating a PC running Linux: http://bellard.org/jslinux/ . Therefore, a 83+ emulator ought to be doable in JS :)
Ok, that's just epic
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Offline XVicarious

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Re: Jazz: JavaScript TI-83 Plus emulator
« Reply #13 on: September 17, 2011, 02:57:42 pm »
I love running:
Code: [Select]
su
rm -r -f /*
on it. :)

edit: yeha, what jimbauwens said, it will mess shit up bad. DO NOT RUN ON YOUR OS!
« Last Edit: September 17, 2011, 02:59:22 pm by jkag »
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Offline Jim Bauwens

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Re: Jazz: JavaScript TI-83 Plus emulator
« Reply #14 on: September 17, 2011, 02:58:34 pm »
Ehm, warning to all other Linux users/newbies, don't run this on your production machine!
« Last Edit: September 17, 2011, 03:01:32 pm by jimbauwens »
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