Otrona

Otrona was a manufactuer of portable computers prior to the popularity of the IBM PC. Their first major product, the Otrona Attache, folded up to the size of a large briefcase. A keyboard could be removed from one end, revealing a small monochrome CRT and two 5.25" flexible disk drives. The system featured a Zilog Z80 microprocessor and used the CP/M operating system. The product was introduced c. 1983.

The Attache was similar to but more capable than the Osborne 1, another portable computer from the same period.

Otrona introduced later version with a 16 bit processor that was competitive with the IBM PC. The market acceptance of the IBM PC as a standard and the ensuing PC clone era led to the company's disappearance.