On Wednesday, March 27, 2019 at 3:20:30 PM UTC-7, Average Person wrote:
... I recall back in the DOS days, there was a
command that could be typed to determine memory, but I am not sure if
that works with modern OSs, nor can I remember the command.

The DOS command is MEM. Try MEM /? to get help for it. Do it in a DOS command window on modern Windows OS's.