Addressable Memory - explanations

[Akuma]

Hi all,

On this issue either, I can not have clear answers (even technical),

• How is the maximum memory addressable by a processor?
• Is this related to the number of bits of proc?
• Taking old processors, why are they limit of 16 for a 8008 KB, 1 MB for 8086/8088?
• Why Windows XP does not know he sent more than 4 GB (giga including reserved for the system)?

Thank you in advance for your answers

[Driscoll]

The maximum limit of memory addressable by a processor is limited by the number of bit address bus of the same processor.

For example, for a 32-bit addressable memory max is 2 ^ 32 or 4294967296 OCETA = 4GB

[Akuma]

Thanks for your reply.
Stay on a 14 bit processor (8008). It is 16,384 different addresses. If I divide it by 1024, I wonder falls on 16 but I do not understand how we can affirm that the unity of those 16 or KB and so the addressable memory is 16 kilobytes
Unless there is disagreement on the concept of address? What is addressable?

Memory is divided into cells (same size), the memory address is the address of each of these cells.
And as globally each cell stores 1 byte (or 8 bits) found good 16 KB
Generalizing, addressable memory =
KB: ((nb bytes per cell) * 2 ^ (nb bits proc)) / 1024
in bits: ((nb bits per cell) * 2 ^ (nb bits proc))

Driscoll thank you for help!

[Curt]

In memory bytes each has its own address to 16,384 addresses so you 16kB is 16,384 bytes.