SMA_SIZE and IDE_BOOT_DRIVE on pcchips810

ollie lho ollie at
Thu Mar 13 21:36:00 CET 2003

On Thu, 2003-03-13 at 16:44, Alessio Sangalli wrote:
> Steve Gehlbach wrote:
> > SiS 630 Dev 0 FN 0
> > Register 63h DRAM Status Register
> So, I hope I've made the correct calculations, I write them here for 
> future reference:
> SMA_SIZE values for different video ram sizes:
> 10000000b -> 0x80h (2MB/4MB)
> 10010000b -> 090xh (4MB/8MB)
> 10100000b -> 0A0xh (8MB/16MB)
> 10110000b -> 0B0xh (16MB/32MB)
> 11000000b -> 0C0xh (32MB/64MB)
> 11010000b -> 0D0xh (64MB/na)
> What I don't understand now is the "double" size value (with the 'not 
> supported' value for 0xD0). What does it mean?

You don't have to care about the double size stuff. Some time in the 
history, there is a feature to add DRAM card for internal VGA. It did
not work out.

> Interesting. But, I was asking to myself... how much time does the 
> hard-disk need to spin-up? I've made few tests and it seems quite fast, 
> only few seconds. How much time is it possible to gain with a CF ide 
> device? I have a small CF card, I should buy the CF-IDE adapter, but I 
> have no idea of the advantages it would bring to me.

For CF/DOM, it is "INSTANT'.

ollie lho <ollie at>

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