I'd probably be the first computer I ever worked with...an Imsai 8080 with 256 Bytes of RAM - 1/4 of 1 K. Programmed in binary through toggle switches on the front panel. Output was a bunch of LEDs - on for 1, off for 0.
Toggle in the address byte, toggle in the data byte, hit load. Repeat infinity - n times. Doing this allowed you to handle important jobs like playing music through an AM radio placed on top of the computer. The music was created by the RFI generated circuitry as the program executed.
Every now and then it hits me just how far we've come since I was in High School.