Definitions for "Conventional Memory"
Keywords:  ram, ibm, memory, intel, kilobytes
First 640K of RAM.
The lower 640KB (or less) of main memory. The remaining portion of main memory, up to 1 MB, is called upper memory. Beyond 1 MB, an MS-DOS – based computer's memory is either expanded memory or extended memory. The memory map does not map beyond upper memory.
The amount of memory accessible by DOS in PCs using an Intel processor operating in real mode, normally the first 640K.
Rembering what you did at Comdex.
remembering what you did at COMDEX