TI-89 HW2 difference
Eric
Completely aside from memory allocation and assembly incompatibility what is
the difference between the TI-89 Hardware version 1 and 2?
Is the chip faster? Overclocked?
gandalf
"Eric" <eric...@hotmail.com> wrote:
>This may be an old conversation but I'm a bit confused.
>
>Completely aside from memory allocation and assembly incompatibility what is
>the difference between the TI-89 Hardware version 1 and 2?
This is a question i've never been completely answered ...
>Is the chip faster? Overclocked?
Well , what i do know is that the way the calc manages the screen has
been change in order to optimize it ( 20% faster ! ) . In fact , video
managing uses a major part of the processor's power : on a HP you ca
disable the screen during a calculus in order to make it faster ...
But , it is completely different from an overclocking ( which you can
still do on a HW2 ) .
The HW also allows you to use the 720k of archive memory , which HW1
normally don't ( i know there is a prog now ) , but i don't know why (
didn't find any info on the net about that :(
Because , the archive memory is contained in the Flash ROM , and if
there is 720k free with the 2.03 , why wouldn't the HW1 be able to use
it while the HW2 does !!!
HW2 calcs also have another Boot version but this is not directly
dependent from the HW ...
Anyway , it prevents you from installing a ROM older than the 1.05 . (
This is purely for talking pleasure but in a way HW version is linked
to Boot Version : The Boot is contained in the 64k before the ROM ,
and this memory area is protected by the HW so... )
I'm afraid i can't tell you more even if know there is a lot of others
things about it ...
Gandalf
Tom Lake
The CPU in the HW2 is run at 12 MHz whereas the chip in the HW1 is run at 10
MHz Even if they use the same chip, a 20% difference isn't likely to be
outside design parameters if the usual overengineering is applied.
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Tom Lake
gandalf
"Tom Lake" <tom...@slic.com> wrote:
>> Is the chip faster? Overclocked?
>
>The CPU in the HW2 is run at 12 MHz whereas the chip in the HW1 is run at 10
>MHz Even if they use the same chip, a 20% difference isn't likely to be
>outside design parameters if the usual overengineering is applied.
Not at all , the CPU is EXACTLY the same . At first , this speed
difference was believed to be coming from a CPU difference but i'm
positive it was discovered ( several months ago ) , that it was wrong
. This difference mainly comes from that video managing difference I
was talking about and i justified it was enough ...
Nevertheless , i recognize there must be others modification which may
exists and speed the HW2 up : So if you know more than that , please
share your knowledge :)
Gandalf
Tom Lake
> difference was believed to be coming from a CPU difference but i'm
> positive it was discovered ( several months ago ) , that it was wrong
> . This difference mainly comes from that video managing difference I
> was talking about and i justified it was enough ...
> Nevertheless , i recognize there must be others modification which may
> exists and speed the HW2 up : So if you know more than that , please
> share your knowledge :)
Yes, the CPU *IS* exactly the same. That was my point. The clock that
drives it IS sped up, though. TI says the new calc is run at 12 MHz vs. 10
MHz for HW1. It's not the CPU which determines how fast the calc runs but
the clock crystal (or R/C network) which makes the CPU run at a given speed.
A CPUs rating is just the maximum tested error-free speed at which the CPU
*SHOULD* be run. It doesn't say how fast the CPU *IS* run. Engineers
usually over-design products so that we have a comfortable margin of error
to allow for tolerance differences, component aging, etc. 20% over rated
speed isn't all that stressful due to this margin of error. I'm not
familiar with the specific part used in the TI but it's very possible that
HW1 is UNDERclocked due to limitations of other components in the system.
The CPU, then, could remain the same while the rest of the calc was beefed
up to allow for the 20% increase or, as I said, the 20% increase could be
coming from cutting down the margin of error with no commensurate parts
change.
Kevin Goodsell
faster, they allow it to use more memory... I heard something that seemed to
imply that it had something to do with the upcomming SDK; some kind of
security issue with the new apps. Does anyone know what I'm talking about
('cause I certainly don't! ;)
-Kevin
Tom Lake wrote in message <5sFG4.2024$h9....@newsfeed.slurp.net>...
John
Kevin Goodsell wrote:
>
> Why do I get the feeling that TI wants to push Hardware 2?
I've had both hw1 and hw2. Hw2 is better: it's faster and
the display is crisper.
I should hope that TI pushes it.