Greetings ( + )!( + )
On Jul 6, 2005, at 7:17 AM, Johns Maillist wrote:
On Jul 6, 2005, at 2:45 AM, [EMAIL PROTECTED] wrote:
Its still a good thing. The thing that gets me is the 800MHz bus,
the 2 PCI
slots, and the Intel graphics card. Oh and that 32 bit processor.
How is this thing as far as the memory goes?
I guess since it is only going to be 32 bit, we would be restricted,
as the WinTel community is, to 4 Gigs of Ram?
John
--
A 32 bit system isn't restricted to 4 gigs of Ram addressing, a virtual
addressing schema can be implemented and an almost unlimited amount of
memory can be addressed. An easy way is to just use a two bit address
schema which would have the appearance of a 64 bit addressing. Of
course this requires an extra piece of hardware and it also slows down
the processing speed. I worked with a telephone switching system (intel
8080) 16 bit addressing which we had implemented an addressing schema
that allow the addressing of first a memory bank and then the
addressing of the memory location. On the first addressing cycle we
addressed the memory bank that we wanted to address (bank 0 thru 7) and
then the second address was the actual memory location that was to be
addressed. However we could have addressed up to 255 memory banks.
The 8080 had a 16 bit address bus and an 8 bit data bus. Internally it
had seven 8 bit registers (A-E, H, L - pairs BC, DE and HL could be
combined as 16 bit registers), a 16 bit stack pointer to memory which
replaced the 8 level internal stack of the 8008, and a 16 bit program
counter. It also had several I/O ports - 256 of them, so I/O devices
could be hooked up without taking away or interfering with the
addressing space, and a signal pin that allowed the stack to occupy a
separate bank of memory
Best Regards,
Harry (*^_^*)
--
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