Re: A89: HW1, HW2, and HW3?
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Re: A89: HW1, HW2, and HW3?
FlashROM normally leaves 'extra' bytes before and after each block I
think, in case a few bytes fail. Next time the Flash controller tests
(each write? each reset?) it might check for bad ones, and remap to the
extras. At least that's how some Flash chips work, I don't know what
TI's are like.
Olle Hedman wrote:
>
> I would say you have a HW1 calc with a different bootloader then the other HW1
> calcs. Maybe TI tried to solve all their problems with HW1 with just changeing
> the bootloader, and then, realized that they couldn't fix it all with just that,
> and released another HW-version.
> I have still not seen a HW2 calc, and noone has yet wanted to send me a scan of
> one, But my personal guess is that they don't differ much, and most of the
> difference is in the chip U8, wich is a chip with programmable logic, that
> handles flashprotection and stuff like that.
> about the free flash. The difference between 720884 and 1024*704 is only 12
> bytes. 704k is 11 pages.
> probably thoose 12 bytes is some kind of reserved bytes, or they are bad bytes
> that you cant use.
> I think more of the first alternative. anyway, it isn't much to talk about :)
>
> //Olle
>
> Scott Dial wrote:
> >
> > Would someone like to check my math for me here. On my memory screen I
> > have "Flash ROM free 720884".
> > Now check my math here... 720884 bytes / 1024 = 703.98828125k (which is
> > impossible since they are 64k pages which means it is actually 704k).
> > Btw, Bryan that means it 702k is highly unlikely they wanted flash apps
> > to line up with flash rom pages. Anyways, the question is this... name
> > my hardware version and guess with ams came on my calc? Anybody who
> > thinks they know is WRONG! My calculator is a "supposed" HW1 (explained
> > later) and it came with ams1.00. HW1 should have 384k I thought... go
> > figure, and grayscale works perfectly. Does anyone else have a HW1.5
> > like me??? There has to be a 3rd hardware version, with 1 inbetween what
> > we call HW1 and HW2. I believe this to be true because AU doesn't work
> > with my calc, and yet mine display characteristic of a HW1. To be more
> > specific with what exactly my calc's version is it came AMS1.00 and on
> > the flash upgrade screen it reports Boot 1.05 build 15. I believe this
> > version to be when they changed the chip to provide better security on
> > the flash rom, but hadn't changed anything further. If I am just stupid
> > please tell me so! This just doesn't make sense! If anyone thinks I am
> > full of shit then I will have to break out my digital camera and capture
> > some pics to prove it to you.
> >
> > --
> > Scott "_Wrath_" Dial
> > wrath@calc.org
> > ICQ#3608935
> > TimeCity AI Guy II - www.timecity.org
> > Member of TCPA - tcpa.calc.org
> > __________________________________________
> > NetZero - Defenders of the Free World
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