Cobra computer in FPGA
Cobra is DIY home computer published around 1985 in Audio-Video magazine.
Z80 processor clocked at 3.25MHz 16KB RAM + 1KB video RAM 2KB ROM with monitor (no build-in Basic)
Pin 4 of B1 connector is cassette player input. Use simple comparator to convert analogue signal to digital (3.3V level!).
FPGA Board: Digilent Spartan-3 Starter kit with XC3S200 FPGA