Author Topic: A new z80 calc... in color?  (Read 61399 times)

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Offline DJ Omnimaga

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Re: A new z80 calc... in color?
« Reply #180 on: November 12, 2012, 04:06:40 pm »
I wouldn't be surprised if it was the same LCD as in the TI-Nspire CX models, but if they plan to offer a cheaper calc, I wouldn't be surprised if they chose a crappier LCD instead. In any case I hope they don't use one with lots of motion blur (although that would at least keep grayscale intact if the calculator has backward compatibility with TI-84+ ASM programs). Imagine playing ASM games with a screen like this (I know some cheap MP3 players use such screens). If doing so doesn't reduce their costs signifiantly, they might still do it anyway just to tempt people into getting the more expensive TI-Nspire CX or TI-Nspire CX CAS instead :P.
« Last Edit: November 12, 2012, 04:13:34 pm by DJ_O »
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Offline DrDnar

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Re: A new z80 calc... in color?
« Reply #181 on: November 12, 2012, 04:18:31 pm »
I'm curious about the LCD.  Is it supposed to use a color palette or individually-controlled RGB pixels? 
We don't know. We probably won't know until an assembly-savvy person gets one and starts dumping code.

I'm a little skeptical that you could get good performance either way
I agree that the vintage Z80 design couldn't provide good graphical performance, but I believe that upping the clock rate and rewriting some of their worst-performing code could provide adequate graphing performance, as in it would take less than ten seconds to graph y=mx+b. We're speculating that an eZ80 could easily provide the performance.

I'm a little skeptical that you could get good performance either way - and I'm even more skeptical that TI could pull it off (these are the same people who brought us MathPrint.)
An eZ80 would easily let them use C, which really makes it more likely they'll be able to implement good functionality, since C is much less specialized that than Z80 assembly. Although, in the end, it'll probably end up being as slow as the original software.
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Offline willrandship

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Re: A new z80 calc... in color?
« Reply #182 on: November 12, 2012, 06:29:40 pm »
@DJ_O I bet it's the CX screen. They would save more money by using the same one everywhere, thanks to bulk pricing.

An RGB color pallete (ala SNES w/ 256 chosen color values) would help the performance vastly, and that would be something implemented into the LCD driver, possibly along with a compatibility mode for the old 84+ (maybe via the bluescale-mode activation routine? :P or maybe they emulate that too, LCD destruction and all)

I wonder how fancy the new display driver will have to be to compensate for TI using such a crappy, ancient architecture keeping compatibility.

I'm still hoping that it's ARM. Hoping.

Offline mlytle0

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Re: A new z80 calc... in color?
« Reply #183 on: November 12, 2012, 09:49:38 pm »
Regarding the speed of this new Z80 calculator, Just wanted to mention that the eZ80, and other potential implementations of this old instruction set don't have to rely on clock speed alone....Some instructions on newer Z80 clones execute the same code in many fewer clock cycles than the original, giving effective comparison speeds well above what simple clock speed multiples would give you.

Assuming that TI is trying to at least competitively match the Prizm, it will have to bench roughly 3 times faster than the current 15 Mhz TI-84.   I have a TI-89, and I can tell you that the Prizm I recently bought is easily 4-6 times as fast as the '89 (in Basic, anyway).  That is what TI has to shoot for....and that should be within reach with the newer Z80 chips.  Available user memory will probably go up as well, well past the 24K currently offered...
« Last Edit: November 12, 2012, 10:05:18 pm by mlytle0 »

Offline squidgetx

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Re: A new z80 calc... in color?
« Reply #184 on: November 12, 2012, 10:04:31 pm »
^Yeah, I think the 50MHz ez80 is comparable to a 200MHz z80 chip.
Personally I'm not too sure that it'll be an ez80...doesn't TI not have the license for ez80s? I guess we'll have to wait and see...
« Last Edit: November 12, 2012, 10:05:18 pm by squidgetx »

Offline cooliojazz

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Re: A new z80 calc... in color?
« Reply #185 on: November 12, 2012, 10:26:55 pm »
I'm pretty sure everyone is just throwing around the eZ80 cause i jokingly said it would be awesome if it had one ;P  Seriously, there's like literally no reason for them to put it in, haha (From TI's viewpoint)
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Offline DJ Omnimaga

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Re: A new z80 calc... in color?
« Reply #186 on: November 13, 2012, 12:33:46 am »
I'm pretty sure everyone is just throwing around the eZ80 cause i jokingly said it would be awesome if it had one ;P  Seriously, there's like literally no reason for them to put it in, haha (From TI's viewpoint)
Except maybe using that as an excuse to jack up the price :P
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Offline Adriweb

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Re: A new z80 calc... in color?
« Reply #187 on: November 13, 2012, 02:08:03 pm »
TI gave me an image :)



(I'll leave the watermark/shadow for now, later will release it "raw", if anyone is interested (for emulators :D)
« Last Edit: November 13, 2012, 02:10:23 pm by adriweb »
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Offline DJ Omnimaga

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Re: A new z80 calc... in color?
« Reply #188 on: November 13, 2012, 02:15:12 pm »
I hope you don't mind if I add it to the news :P
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Offline Adriweb

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Re: A new z80 calc... in color?
« Reply #189 on: November 13, 2012, 02:15:28 pm »
go ahead lol

Anyway, I should get more photos (in HD) in january :)
« Last Edit: November 13, 2012, 02:15:46 pm by adriweb »
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Offline DJ Omnimaga

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Re: A new z80 calc... in color?
« Reply #190 on: November 13, 2012, 02:21:21 pm »
Cool to hear. I added it although I probably won't post a news news just for the pic. I might wait until there are more infos to post (or someone else posts more info)

I like how the fonts still seems close to the originals. I hope they're not that blurry, though. Also I'M disappointed that the ON and ENTER keys are still not aligned properly with the rest. :(
« Last Edit: November 13, 2012, 02:22:35 pm by DJ_O »
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Offline Adriweb

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Re: A new z80 calc... in color?
« Reply #191 on: November 13, 2012, 02:22:16 pm »
Cool to hear. I added it although I probably won't post a news news just for the pic. I might wait until there are more infos to post (or someone else posts more info)
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Offline DJ Omnimaga

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Re: A new z80 calc... in color?
« Reply #192 on: November 13, 2012, 03:27:50 pm »
What I wonder is why they didn't go with the TI-84 Pocket.Fr design, since they seemed to be moving towards that? The current look is very nice, though.
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Offline DrDnar

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Re: A new z80 calc... in color?
« Reply #193 on: November 14, 2012, 10:43:16 am »
That mockup image was created in Adobe Illustrator. It's not blurry, it's anti-aliased.

Anyway, this might get taken down, but here's an SVG similar to the above image, and a high-res PNG render of it. The file was extracted from the official TI-30X emulator TI sells to teachers. I'd post the whole .jar file (renamed to .zip so you can explore it), but the attachment limit is 4 MB and the .jar file is 9 MB.
« Last Edit: November 14, 2012, 10:56:39 am by DrDnar »
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Offline Adriweb

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Re: A new z80 calc... in color?
« Reply #194 on: November 14, 2012, 10:44:49 am »
Well, a teacher would have to leak the 84c teacher software in order for us to extract the .svg :D
« Last Edit: November 14, 2012, 10:45:03 am by adriweb »
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