Conventional, High, and Extended Memory

The memory in a PC can be considered to be in 4 parts:
  1. Conventional
  2. High (or Upper)
  3. Extended
  4. Expanded

When we are speaking of these types of memory, we are actually referring to 'parts' of RAM! Remember than memory (RAM) can be FPM DRAM, EDO RAM, and even SDRAM. What you get is based on what the manufacturer of your PC installs on the PC's motherboard. Some basic concepts in memory:

  1. If a machine has 640 KB or less of memory it is conventional memory. This is where programs are loaded, some data, part of the operating system, etc. So, the first 640KB of RAM is 'conventional memory'.
  2. If a machine has 1 MB of memory, 640 KB will be conventional memory, and 384 KB will be 'high' or upper memory, for a total of 1 MB.
  3. If a machine has over 1 MB of memory, 640 KB will be conventional memory, 384 KB will be high memory, and normally, the rest will be extended memory.
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Memory