The Olympia OP-544 was the same machine as the Casio PB-100.
The OP-644 also had the same specifications, but featured a built-in 20-line thermal printer and a better keyboard layout with a true space bar. It was actually a Casio FX-802P
The Olympia OP-544 was the same machine as the Casio PB-100.
The OP-644 also had the same specifications, but featured a built-in 20-line thermal printer and a better keyboard layout with a true space bar. It was actually a Casio FX-802P