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I have a very simple (n00b) question.
A 20-bit external address bus gave a 1 MB physical address space (2^20
= 1,048,576).(Wikipedia)
Why 1 MByte?
2^20 = 1,048,576 bit = 1Mbit = 128KByte not 1MB
I misunderstood something.
When you have 20 bits you can address up to
2^20. This is your range, not the number of bits.I.e. if you have 8 bits your range is up to 255 (unsigned) not 2^8 bits.
So with 20 bits you can address up to 2^20 bytes i.e. 1MB
I.e. with 20 bits you can represent addresses from 0 up to
2^20= 1,048,576. I.e. you can reference up to 1MB of memory.