group of consecutive memory that has had physical memory assigned to it
If there are 2^n cells then you need at least n bits to address each cell individually. For example, if there 2^32 cells then you need at least 32 bits to address each of the cells. 2^32 = 4,294,967,296 cells The cells are numbered the range 0 to 4,294,967,295 (inclusive). In hexadecimal notation this range becomes 0h to FFFFFFFFh. The upper bound has exactly 8 hex digits. Each hex digit represents the 4-bit binary value 1111. 8 x 4 bits = 32 bits. QED.
Hexadecimal uses the digits 0-9 and the letters a-f (in either upper case A-F, or lower case a-f). You appear to have used a letter O in upper case and lower case (o). Neither is a valid [standard] hexadecimal digit; so 3EO and 3Eo both mean the same in hexadecimal: a non-valid number. 3E0 and 3e0 are both valid hexadecimal numbers that mean the same (as the decimal number 992). In C, to signify a hexadecimal number it is preceded by 0X or 0x (that is zero-letter X), as in 0x3E0, etc.
The memory addresses from 0 to 640 KB are known as conventional memory. This range was primarily used in early personal computers, specifically in the context of the x86 architecture. It was the area of RAM available for use by MS-DOS and older operating systems, where most applications and programs would operate. Beyond this range, from 640 KB to 1 MB, is known as upper memory.
The web address of the Upper Arlington Historical Society is: www.uahistory.org
Warren Landing Upper Range Lights was created in 1908.
Upper Memory
Upper Memory
Craighill Channel Upper Range Rear Light was created in 1886.
Craighill Channel Upper Range Front Light was created in 1886.
The web address of the Upper Peninsula Firefighters Museum is: coppercountryfirefightershistorymuse
Most DOS applications utilize conventional memory. Many DOS applications can not utilize extended or expanded memory without special software. When you load device drivers into upper memory, you leave more conventional memory free for other applications to use.
The upper range of human hearing is typically around 20,000 Hz.