Ben, Thanks again for the wealth of valuable information.
- Jeff
Ben Combee wrote:
> "DIAMOND JEFF" <[EMAIL PROTECTED]> wrote in message
> news:38070@palm-dev-forum...
> >
> > I know this is highly likely, but since a lot of ARM cores (especially
> > early on) didn't support 16-bit numbers, and since I've learned not to
> > assume anything, I wondered if Palm will be using ARMs with 16-bit
> > number support?
>
> Palm stated that they will support the ARM 4T architecture, which is used in
> the ARM7, and is supported by ARM9 and XScale/StrongARM. This includes
> 16-bit data access instructions that do either zero or sign extension. The
> development board they showed PalmOS 3.5 running on was using a ARM7
> core-based chip from Cirrus Logic. They did say they were not going to
> support Thumb, which is a 16-bit variant of the ARM instruction set
> implemented on some ARM chips -- its main use is on memory constrained
> systems and 8/16 bit bus systems, so that points to them using a 32-bit bus
> to memory; otherwise, they would have a major bottleneck in instruction
> fetching.
>
> BTW, you can download the current ARM architecture manual, including the
> complete instruction set, from www.arm.com. Just go to the "technical
> support" section, and follow the links to documentation. The current ARM
> Architecture Reference Manual, 2nd edition, just was published in December,
> is over 800 pages, and seems to consistently be around $55 at any of the
> online book stores that carry it.
>
> --
> Ben Combee
> Veriprise Wireless <http://www.veriprise.com>
>
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