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
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NAME
OP 544 / OP 644
MANUFACTURER
Olympia
TYPE
Pocket
ORIGIN
Japan
YEAR
1982
END OF PRODUCTION
Unknown
BUILT IN LANGUAGE
Basic interpreter
KEYBOARD
53 keys with numeric keypad
CPU
HD61913 CMOS VLSI
SPEED
455 kHz ceramic resonator used as system clock
RAM
1 KB (544 bytes for Basic programs) up to 2 KB
ROM
12 KB
TEXT MODES
1 line x 12 chars plus a 4 digit seven segment display part
GRAPHIC MODES
None
COLORS
Monochrome LCD
SOUND
None
SIZE / WEIGHT
165 (W) x 71 (D) x 10 (H) mm / 116 g (with batteries)
I/O PORTS
12-pin expansion port for printer and cassette interface 11-pin internal slot for memory module
POWER SUPPLY
2 x CR-2032 lithium batteries
PERIPHERALS
CI-546 cassette interface, and all Casio PB-100 extensions
