OP 544 / OP 644
L’Olympia OP-544 era la stessa macchina del Casio PB-100.
Anche l’OP-644 aveva le stesse specifiche, ma presentava una stampante termica incorporata a 20 righe e un layout di tastiera migliore con una vera barra spaziatrice. In realtà era un Casio FX-802P
| NAME | OP 544 / OP 644 |
| MANUFACTURER | Olympia |
| TYPE | |
| 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 |
| PRICE | Unknown |
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