At 4:45 PM -0700 2000/08/10, Richard Hartman wrote:
>I had just assumed that since (at least in originally) RAM
>and ROM were on different cards (ROM was on the motherboard
>and the RAM was plugged in to a slot), there would be a different
>card number...
Actually, RAM and ROM have always been together on the same card. We didn't start
putting either on the motherboard until we developed products with no card slot at
all. And even then it's just a simple matter of configuring the DragonBall chip select
registers appropriately. Incidentally, Handspring's Visor is the first and only
product to support any card other than #0.
>So the "card number" is just the high 4 bits? Hmm... Not
>nearly so useful ...
Well, it's actually a bit more complicated than that. But fundamentally, that's the
idea.
>although you -could- put the ROM and
>FLASH and RAM into different address spaces, there would
>be a lot of wasted space that way...
The ROM and RAM *are* in different address spaces, so I'm not sure what you mean by
that... there are hard limits to the maximum size of both ROM and RAM areas... don't
expect the Palm OS to address 1 Gig of RAM any time soon... ;o)
Regards,
Jim Schram
Palm Incorporated
Partner Engineering
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