A89: Re: Hardware differences:
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A89: Re: Hardware differences:
>
> Ok, I'll sum up everything I've heard, and then speculate, and I'd like
> those who know better to correct me where I make mistakes...
>
> To my knowledge the major differences in the hardware between Version 1
> and 2 of the TI-89 are:
> -Faster speed (12 MHz vs 10 MHz)
Well has anyone actually tried with a scope ?
Afair TI wrote in some statement that they introduced the
new logic, which is buffering the display ram, to speed up
the TI.
So this 20% Speedup is no result of a higher clock, but
because of no DMA taking place.
Well, in my opinion it should be possible to rewrite the
gray4lib to copy the screen buffer. This may result in a
slow down, but maybe it is possible to reduce it with
clever optimizing.
Games with good (timer based) logic wont suffer
too much from this slowdown. But i guess most games
have hardcoded delay loops as they are generally not
programmed very well..
> -Different programmable logic (either different program and/or
> different chip to keep people from messing with the ROM and
> certificates)
> -Different way of running the LCD
>
> It's the last point I want to target. I've heard on this list that:
> -You have to copy the display to itself in order to get the
> display data to display
> -Gray scale doesn't work, not because of lack of interrupts, but
> because this copying to self takes too much time
References: