All computer electronics are housed in a one-piece computer case with an integrated keyboard. The keyboard also contains a separate block of cursor keys. The computer has two cartridge slots and two joystick connectors located on the right side.

The HB-75 was aimed at the Japanese market and was available in two colors: black and white. The European models were only in black. The model is an expanded version of the HB-55, with more internal memory and a better keyboard. The HB-75 has a built-in database, with applications for addresses, notes, and an agenda. This data can be stored on cassette tape or memory cartridge.