A Trash-80! My best friend Kira had one of those. Her cassette drive was on a card table, and we had to enter and exit the room VERY carefully, because if a program was loading and we bumped the card table, the cassette would skip the program and we'd have to rewind and start over.
Heh heh, they were known for that.
Also, if I recall correctly the cassettes were only good for several loadings. Then the quality of the cassettes degraded to a point where you'd get loading errors.
And forget about graphics. All you got were a bunch of simple ASCII characters.