[iyonix-support] Re: Video Card RAM

On Fri 31 Oct, Richard Ashbery wrote:
> 
> In article <4ff6e00ce2chris@xxxxxxxxxxxx>,
>    Chris <chris@xxxxxxxxxxxx> wrote:

> 
> Understand that 7FFFFFF is equivalent to 128MB (134217727/1048576).
> 
> What I still don't understand is why you appear to have to remove an F
> from the end of the maximum memory address which is 7FFFFFFF. Can
> someone please have another go at explaining this.

The computer reports that memory used is:

> >  * Memory 01000000-01FFFFFF
> >  * Memory 78000000-7FFFFFFF

Ignoring the first block the memory used is in the memory map between point
A & point B where A = &78000000 and B=&7FFFFFFF  (yes 7 F's)

The amount of memory used is therefore:
 
 &7FFFFFFF - &78000000    (7 F's 6 0's)

Which equals &7FFFFFF   6 Fs

It just happens that the 128MB memory block goes upto the address 16 times
128MB which when written in hex is the same as 128MB but with an extra F!


Chris Evans

-- 
CJE Micro's / 4D                'RISC OS Specialists'
Telephone: 01903 523222             Fax: 01903 523679
chris@xxxxxxxxxxxxxxx     http://www.cjemicros.co.uk/
78 Brighton Road, Worthing, West Sussex,     BN11 2EN
The most beautiful thing anyone can wear, is a smile!


---
To alter your preferences or leave the group, 
visit http://www.freelists.org/list/iyonix-support
Other info via http://www.freelists.org/webpage/iyonix-support

Other related posts: