Parallel Port functionality enhancement for HUNVEYOR-4 robotic space probe

Oftentimes robot enthusiasts use the 8-bit parallel port to control their devices. But what if the eight bits are simply not enough? The parallel port multiplier, developed for HUNVEYOR-4, is able to maintain up to 32 output bits. We also worked out a method and a device, reading back four analogue and seven additional digital values into the educational space probe, using only eight output bits and two status bits.