My first computer in the 1980's, an Acorn Electron.. Had no memory at all, to load up programs it 'listened' to a cassette tape and loaded from there. It was very basic and you could write programs from a magazine, it took ages to write them in, miss a dot and it wouldnt work, very frustrating.. I bought an interface that plugged into the back, two cartridges that gave you simple word processing and a very basic spreadsheet, good fun though...