In 1976, they came out with their first full microcomputer, the Z-1, which used the same chassis as the IMSAI 8080 but fitted with a 4 MHz Zilog Z80 processor instead of the Intel 8080. The Z-1 was very flexible for the time, with 8 KB of static RAM and 22 S-100 bus expansion slots. This allowed the computer to immediately function upon power-up, without manually loading a boot program.