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Author Topic: eZ80 Hardware Discussion  (Read 57779 times)

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SirCmpwn

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Re: eZ80 Hardware Discussion
« Reply #60 on: August 07, 2010, 04:25:46 pm »
I would say 50 MHz.  KOS is multithreaded, people.
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Offline JonimusPrime

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Re: eZ80 Hardware Discussion
« Reply #61 on: August 07, 2010, 04:27:10 pm »
Quote from: SirCmpwn on August 07, 2010, 04:25:46 pm
I would say 50 MHz.  KOS is multithreaded, people.
Lets not decide on an OS before we have the hardware set shall we. As cool as KOS is I think the OS should be built to the hardware not the other way around.
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Offline DJ Omnimaga

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Re: eZ80 Hardware Discussion
« Reply #62 on: August 07, 2010, 04:27:35 pm »
20 MHz sounds good. We need to make sure to choose a LCD with a good LCD driver to not run into the grayscale problems seen on the 8x series, though. Sure, the focus needs to be math (with a way to allow teachers to lock down the calc to not allow 3rd party software/patched OS usage and with no way to crack that temporary protection), but you need to not repeat TI's mistakes.
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SirCmpwn

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Re: eZ80 Hardware Discussion
« Reply #63 on: August 07, 2010, 04:29:47 pm »
Quote from: JonimusPrime on August 07, 2010, 04:27:10 pm
Lets not decide on an OS before we have the hardware set shall we. As cool as KOS is I think the OS should be built to the hardware not the other way around.
While this is an admirable goal, I prefer to have the software and the hardware complement each other.  No need to keep them separate, if you plan both from an early age, you can craft them to suit each other.
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Offline fb39ca4

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Re: eZ80 Hardware Discussion
« Reply #64 on: August 07, 2010, 04:30:34 pm »
I thought we would have an lcd driver with native grayscale support.
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Offline JonimusPrime

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Re: eZ80 Hardware Discussion
« Reply #65 on: August 07, 2010, 04:32:15 pm »
Quote from: fb39ca4 on August 07, 2010, 04:30:34 pm
I thought we would have an lcd driver with native grayscale support.
Something with memory mapping would be nice as well, needing to interface the LCD for every change is a pita.
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SirCmpwn

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Re: eZ80 Hardware Discussion
« Reply #66 on: August 07, 2010, 04:32:59 pm »
I don't think memory mapping is a good idea, unless you can quickly change the map.  It would also be nice to leave some of the RAM free, instead of committing some to the screen.
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Offline DJ Omnimaga

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Re: eZ80 Hardware Discussion
« Reply #67 on: August 07, 2010, 04:35:31 pm »
If we use Flash memory, we also need to use a Flash chip (and writing to flash method) that won't wear out after 2-3 years like the first batch of Casio Algebra FX 1.0 and 2.0 graphing calculators. (it was fixed in later batches)
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Offline calc84maniac

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Re: eZ80 Hardware Discussion
« Reply #68 on: August 07, 2010, 04:35:44 pm »
Quote from: SirCmpwn on August 07, 2010, 04:32:59 pm
I don't think memory mapping is a good idea, unless you can quickly change the map.  It would also be nice to leave some of the RAM free, instead of committing some to the screen.
We would have to commit a buffer to hold screen data anyway. I don't see your point. Being able to change the memory address of the buffer on-the-fly would be good though.
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Offline JonimusPrime

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Re: eZ80 Hardware Discussion
« Reply #69 on: August 07, 2010, 04:40:10 pm »
Quote from: calc84maniac on August 07, 2010, 04:35:44 pm
Quote from: SirCmpwn on August 07, 2010, 04:32:59 pm
I don't think memory mapping is a good idea, unless you can quickly change the map.  It would also be nice to leave some of the RAM free, instead of committing some to the screen.
We would have to commit a buffer to hold screen data anyway. I don't see your point. Being able to change the memory address of the buffer on-the-fly would be good though.
Thats how TI-86 grayscale is done, they just had the interrupt switch which buffer the Display driver pointed at.
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Offline DJ Omnimaga

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Re: eZ80 Hardware Discussion
« Reply #70 on: August 07, 2010, 04:41:32 pm »
I believe on the TI-85 and the very early TI-81s it was how it was done too.
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SirCmpwn

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Re: eZ80 Hardware Discussion
« Reply #71 on: August 07, 2010, 07:10:59 pm »
Idea:
We don't have a battery slot.  Instead, we have an internal battery inside the device that charges via the mini-usb port.  Then, we can have companion software for the computer for transfers and updates, like iTunes for the iPod.  I can write the companion software, but the hardware should be there to support it.
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Offline DJ Omnimaga

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Re: eZ80 Hardware Discussion
« Reply #72 on: August 07, 2010, 07:15:19 pm »
that could work, too.
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Offline jnesselr

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Re: eZ80 Hardware Discussion
« Reply #73 on: August 07, 2010, 07:55:48 pm »
I like that idea.

<offtopic>So, so far, sir seems to be the z80 leader, and I being the arm leader. Btw, sir, since you are a leader, you get to be a moderator. Congrats. </offtopic>
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Offline Happybobjr

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Re: eZ80 Hardware Discussion
« Reply #74 on: August 07, 2010, 08:15:14 pm »
truthfully I don't love that idea,  I dont' think people bring a portable usb charger (like me :P) on the bus, so if they run out of power...
Note: although you could have a warning at 2 hours, or so, left or something so it doesn't die during a test.

« Last Edit: August 07, 2010, 08:16:03 pm by happybobjr »
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