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Math coprocessor?

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Topic: Math coprocessor?    
BertBert
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Registered: Nov 1999
Location: Greenwood, IN
Posts: 125

Hi all,

Forgive my ignorance on technical matters like this, but is it true that the Visor's internal structure does not include a math coprocessor? I seem to remember someone saying that this was the case. If so, has anybody ever thought about making a springboard module that is just a math coprocessor, that perhaps could be used to accelerate number-heavy programs like Quicksheet? (Can such a module even be made?)

I mention this because I use Quicksheet to keep a gradebook for my classes, and this late in the semester I have a lot of stuff in each workbook and Quicksheet is almost painfully slow under these conditions. (Quicksheet is a wonderful program, don't get me wrong.) I'd shell out $35-50 for a module like the one I described above if it could speed stuff like this up. (Maybe even stick 2 MB of memory on it, ala the Innogear vibrating alarm module?)

Talk amongst yourselves.

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BertBert
Mark 12:28-31

BertBert is offline Old Post 11-16-2000 12:15 PM
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MarkEagle
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Registered: Dec 1999
Location: Connecticut USA
Posts: 2682

quote:
Originally posted by BertBert
...and Quicksheet is almost painfully slow under these conditions.


The reason Quicksheet is slow probably has more to do with the auto-recalc than anything else. You can turn off auto-recalc in the Worksheet properties... it makes a big difference. Then, you just need to remember to recalc manually!

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MarkEagle is offline Old Post 11-16-2000 01:05 PM
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BertBert
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Registered: Nov 1999
Location: Greenwood, IN
Posts: 125

quote:
Originally posted by MarkEagle
quote:
Originally posted by BertBert
...and Quicksheet is almost painfully slow under these conditions.


The reason Quicksheet is slow probably has more to do with the auto-recalc than anything else. You can turn off auto-recalc in the Worksheet properties... it makes a big difference. Then, you just need to remember to recalc manually!



I tried this, and then I went into one of my gradebooks and entered in a two-digit number into one of the cells -- and it took about 10 seconds just for the Visor to enter the number and move to the next cell! So I am not sure if the auto-recalc is really the source of the slowness. Thanks for the advice though.

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BertBert
Mark 12:28-31

BertBert is offline Old Post 11-16-2000 01:11 PM
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MPM
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Registered: Jun 2000
Location: Sunnyvale, CA
Posts: 216

Post No FPU

quote:
Originally posted by BertBert
Hi all,

Forgive my ignorance on technical matters like this, but is it true that the Visor's internal structure does not include a math coprocessor? I seem to remember someone saying that this was the case. If so, has anybody ever thought about making a springboard module that is just a math coprocessor, that perhaps could be used to accelerate number-heavy programs like Quicksheet? (Can such a module even be made?)
...



There is no math coprocessor in the Visor. The Visor uses the Motorola Dragonball EZ processor. The Dragonball is based upon the 680X0 family of processors. The 68020 can hook up to an external FPU, and the 68030/40/60 all have the FPU in them. BUT the Dragonball does not have an internal FPU nor can it hook up to an external one.

I suppose that one could make a Springboard module that had an FPU in it and that had software with it that hooked it into the existing floating point math library, but I don't think it would increase math performance very much. The slowdown comes from the software having to transfer the numbers to the FPU in the Sprinboard module and then transfer the result back out. A coprocessor based FPU does not have this software transfer in/out penalty.

MPM is offline Old Post 11-16-2000 08:27 PM
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parb33
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Registered: Jan 2000
Location: Lawrence, NY, USA
Posts: 148

Have you considered overclocking QuickSheet?

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parb33 is offline Old Post 11-17-2000 04:36 AM
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california boyhead
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Re: No FPU

quote:
Originally posted by MPM
The 68020 can hook up to an external FPU, and the 68030/40/60 all have the FPU in them.
[/B]


Actually...
the 68030's FPU was external and not always included... It used the 68882 FPU, derived from the 68020's FPU, the 68881. The 68040 had an FPU in its full form, but Motorola did release some as 68LC040's with out FPU functionality built-in...

california boyhead is offline Old Post 11-17-2000 08:35 AM
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parb33
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Re: Re: No FPU

quote:
Originally posted by california boyhead
Actually...
the 68030's FPU was external and not always included... It used the 68882 FPU, derived from the 68020's FPU, the 68881. The 68040 had an FPU in its full form, but Motorola did release some as 68LC040's with out FPU functionality built-in...


Were you the one who once called the rest of the discussion board nerds?

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parb33 is offline Old Post 11-17-2000 03:06 PM
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MPM
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Post Re: Re: No FPU

quote:
Actually...
the 68030's FPU was external and not always included... It used the 68882 FPU, derived from the 68020's FPU, the 68881. The 68040 had an FPU in its full form, but Motorola did release some as 68LC040's with out FPU functionality built-in...



You are correct. I gooffed on the 68030 having an FPU. It has the 68851 Paged Memory Management Unit integrated, not the 68882 FPU. I had forgotten about the FPU-less 68LC040s.

I should have looked in my Motorola databooks (sitting 2 feet behind me) before I hit "submit".

Nerds unite!

MPM is offline Old Post 11-17-2000 09:06 PM
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mjoeyb
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Registered: Oct 2000
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There are lots of programs that are made for tracking grades. I know of two of them that you can download at least a trial version of the software. I have seen Due Yesterday and Four.Zero, but I am sure that there are lots more out there. I have not used them too much, but I am sure that the refresh rate is much faster than quicksheet. Of course, if you really like quicksheet...

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mjoeyb is offline Old Post 11-18-2000 03:52 AM
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california boyhead
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Re: Re: Re: No FPU

quote:
Originally posted by parb33
Were you the one who once called the rest of the discussion board nerds? [/B]


youre right my bad, i meant geeks not nerds...
btw did u see the name of Limp Biscuit's new album? I cant believe that these guys, the marketing folks, and the management all agreed that this was the best they could do...

california boyhead is offline Old Post 11-20-2000 10:37 AM
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parb33
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I agree, the name is a pretty poor effort. Kinda nauseating if you ask me. BTW, what is the difference between geeks and nerds?

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parb33 is offline Old Post 11-20-2000 10:58 PM
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yucca
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Back to the topic at hand . . .

. . . and not that I disapprove of meandering conversations . . . but back to BurtBurt's original question.

There is no reason why someone like TI couldn't release a module with an optimized processor that actually runs the application on the module (which would have to have its own memory), and only use the Visor as a display device. Of course, if you are going to go to all this trouble, you would want more than a mere speadsheet. Maybe something like a Mathmatica-lite or Mathcad SBM. Actually, a Mathcad SBM might be feasible. Given the low volume sales for such a device, I'm afraid to even imagine what the price might be.

yucca is offline Old Post 11-21-2000 03:42 AM
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BertBert
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Registered: Nov 1999
Location: Greenwood, IN
Posts: 125

Re: Back to the topic at hand . . .

quote:
Originally posted by yucca
Of course, if you are going to go to all this trouble, you would want more than a mere speadsheet. Maybe something like a Mathmatica-lite or Mathcad SBM. Actually, a Mathcad SBM might be feasible. Given the low volume sales for such a device, I'm afraid to even imagine what the price might be. [/B]


Well, I know that there is a WinCE version of Maple 6 out there -- I saw it at a Maple workshop, and when I asked the Maplesoft reps about a PalmOS version, they were pretty sure there was not one but thought it would be a good idea.

As for volume sales, I agree with you -- although Handspring could really change this if they wanted to. A few weeks ago I posted elsewhere that the educational market niche seems to have gone virtually untapped by Handspring and everybody else. Handspring would really do well to target colleges and universities to market both hardware and software. This is what TI did with graphing calculators, and now they practically have the educational market all to themselves. If Handspring marketed the Visor along with modules and software with college students and faculty in mind, it could create whatever volume it needed.

But this is now a meandering conversation, isn't it?

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BertBert
Mark 12:28-31

BertBert is offline Old Post 11-21-2000 01:04 PM
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heed
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Registered: Nov 2000
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Posts: 69

Talking

To answer your question (difference btwn nerds and geeks), you can't spell Geek without EE ;-) I heard that a lot, since it was one of my majors at Auburn!

heed is offline Old Post 11-21-2000 02:51 PM
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chrisfoster
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Registered: Apr 2000
Location: Urbana, IL
Posts: 99

Much of the slowdown lies not in the math but in the time it takes to display the spreadsheet, as heavy drawing code will be a kick in the pants for the Visor

chrisfoster is offline Old Post 11-25-2000 03:27 PM
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