An Intel 8085 S-100 card to directly replace the IMSAI 8080A CPU card, with the advantage of a 50% increase in processor speed with no faster memory access time requirement. The challenge was to accurately emulate the Intel 8080A’s timing and status signals, which included generation of the EI (interrupts enabled) signal. Included 2 layer PC layout and tape up. Shown at the West Coast Computer Fair in 1981.