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Author Topic: VOTE: CPU for OTZ80 - eZ80 20 MHz or 50 MHz?  (Read 33067 times)

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Offline alberthrocks

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Re: VOTE: CPU for OTZ80 - eZ80 20 MHz or 50 MHz?
« Reply #45 on: August 09, 2010, 06:38:34 pm »
This poll will end tonight. If you haven't already voted, please do so now!
(8/9/2010)
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Offline alberthrocks

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Re: VOTE: CPU for OTZ80 - eZ80 20 MHz or 50 MHz?
« Reply #46 on: August 10, 2010, 09:18:14 pm »
Majority says eZ80 50 MHZ, underclockable to 20 MHZ! Voting is now closed. This is now a final feature in OTZ80!
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Offline jnesselr

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Re: VOTE: CPU for OTZ80 - eZ80 20 MHz or 50 MHz?
« Reply #47 on: August 10, 2010, 10:01:36 pm »
I changed it in the hardware section on the wiki.
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Offline alberthrocks

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Re: VOTE: CPU for OTZ80 - eZ80 20 MHz or 50 MHz?
« Reply #48 on: August 11, 2010, 12:56:06 am »
@graphmastur: Great, thanks! :) I'm also having a thread here for others to easily keep track.
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Offline Builderboy

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Re: VOTE: CPU for OTZ80 - eZ80 20 MHz or 50 MHz?
« Reply #49 on: August 11, 2010, 01:42:41 am »
Sounds good, seemed like the best option out there imho :) a compromise for both ^^
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Offline DJ Omnimaga

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Re: VOTE: CPU for OTZ80 - eZ80 20 MHz or 50 MHz?
« Reply #50 on: August 15, 2010, 05:59:03 pm »
Have you guys checked if that type of processor can be underclocked at all, though? I know the TI-83+SE processor can be, same for the TI-Nspire ARM processor, though.
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Offline matthias1992

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Re: VOTE: CPU for OTZ80 - eZ80 20 MHz or 50 MHz?
« Reply #51 on: March 16, 2011, 06:00:27 pm »
Bump, again.

Anyways I think we might want to reconsider

eZ80 @ 50 mhz vs propellor octa-core @ 80 mhz

Not that multitasking is a must but with the propellor chip we have
8 true indepedent cores running @ 80 mhz with 20 mips per core
Full 32 bit math
Video/tv out support
Audio jack out support
Possible vga and ps2 support
I saw an sdram extension kit for 32mb of ram BUT someone came up with this brilliant sd card which can connect to wifi...yea that is right wifi! And guess what, propellor can easily interface with an SD card!
We could even have, say, 2 system management dedicated cores and then 6 free stream cores...

It costs. $8 (pfq44)

Nearly nothing...
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Ashbad

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Re: VOTE: CPU for OTZ80 - eZ80 20 MHz or 50 MHz?
« Reply #52 on: March 16, 2011, 07:25:46 pm »
wow, that octa-core sounds sick O.O
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Offline willrandship

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Re: VOTE: CPU for OTZ80 - eZ80 20 MHz or 50 MHz?
« Reply #53 on: March 16, 2011, 07:26:08 pm »
I don't really see a point in maintaining z80 compatibility, considering it would be illegal to include an 84+ emu anyways (unless it had kOS on it)

Really, anything would work fine, if it had the power. The propeller fits those needs, and would be highly programmable, considering it's a very popular dev board right now.
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Offline Juju

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Re: VOTE: CPU for OTZ80 - eZ80 20 MHz or 50 MHz?
« Reply #54 on: March 16, 2011, 08:28:13 pm »
Quote from: willrandship on March 16, 2011, 07:26:08 pm
I don't really see a point in maintaining z80 compatibility, considering it would be illegal to include an 84+ emu anyways (unless it had kOS on it)
It's not illegal if it ships without a ROM (or with kOS, of course) and you have to provide your own, I think.
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Offline AngelFish

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Re: VOTE: CPU for OTZ80 - eZ80 20 MHz or 50 MHz?
« Reply #55 on: March 16, 2011, 09:03:39 pm »
Quote from: Ashbad on March 16, 2011, 07:25:46 pm
wow, that octa-core sounds sick O.O

Can you imagine the headache of writing assembly for a multi-core processor?
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Offline Xeda112358

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Re: VOTE: CPU for OTZ80 - eZ80 20 MHz or 50 MHz?
« Reply #56 on: March 16, 2011, 10:16:11 pm »
Wait, this project plans to emulate a TI-8x? I thought we just wanted to maintain compatibility so that we could interact with it and because most of us here are familiar with ARM or Z80. I personally love the Z80 :D

So if we use a Z80 that is backwards compatible and KOS is made for this and the TI calcs, then that means we could start making assembly programs compatible on both platforms. The only issue would be directly playing with ports... KOS would need to make ROM calls that functioned differently to handle port reading/writing properly (but with the same address). Then we could start making KOS programs for the 83+/84+ that work on OTZ80.
« Last Edit: March 16, 2011, 10:17:05 pm by Xeda112358 »
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Offline jnesselr

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Re: VOTE: CPU for OTZ80 - eZ80 20 MHz or 50 MHz?
« Reply #57 on: March 16, 2011, 11:00:36 pm »
Considering the specs on those chips, why not make uberspire OT-arm, and make OT-octa?

Also, I don't care much about cross-compatibility.  I don't want a calc that works with TI in everything.  That's called a TI-calc.  We want awesome calcs.  I can see emulating the pages and stuff.

@matthias: Do you have a really good link to that?
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Offline matthias1992

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Re: VOTE: CPU for OTZ80 - eZ80 20 MHz or 50 MHz?
« Reply #58 on: March 17, 2011, 09:28:56 am »
http://www.parallax.com/propeller/

We could also wait for the propellor two which is far more powerfull and comes at the same price (at least, I thought I read that somewhere).

As for z80 compatibility a z80 core emulator has already been written for the propellor, it is however as far as I know written in SPIN which is the interperted language for the propellor.

Prop. ASM might not exactly be a breeze but the community is very helpfull and very knowledgeable, hell, even the chip designers get in to some topics everry now and then.

And grapmastur, I think we should do one calc at the time, lets start with the easy one, gain experience with the whole process and then make the second one if the prev. one was a succes...

Just my three cents :)
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Offline jnesselr

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Re: VOTE: CPU for OTZ80 - eZ80 20 MHz or 50 MHz?
« Reply #59 on: March 17, 2011, 08:36:45 pm »
Okay, we could do one calc at a time.  And starting with a z80 based calc would be very nice I presume.

Okay.  I'll go over the supply list again.  Is anyone good at designing electronic schematics? It's definitely not my skill.  Open source design programs would be nice like eaglescad I think is free.  Something like that.  Or even a .pdf of your circuit describing it.  But yeah, that's a little farther ahead.
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