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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ

content/museum/olympia-op-544-op-644.md

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+---
+title: Olympia OP 544 / OP 644
+categories:
+- Computers
+types:
+- Pocket
+origins:
+- Japan
+years:
+- '1982'
+cpus:
+- HD61913 CMOS VLSI
+params:
+  name: OP 544 / OP 644
+  image: /media/museum/photos/olympia_op544_system_s1.jpg
+  company: /companies/olympia
+  company_name: Olympia
+  specs:
+  - label: NAME
+    value: OP 544 / OP 644
+  - label: MANUFACTURER
+    value: Olympia
+  - label: TYPE
+    value: Pocket
+  - label: ORIGIN
+    value: Japan
+  - label: YEAR
+    value: '1982'
+  - label: END OF PRODUCTION
+    value: Unknown
+  - label: BUILT IN LANGUAGE
+    value: Basic interpreter
+  - label: KEYBOARD
+    value: 53 keys with numeric keypad
+  - label: CPU
+    value: HD61913 CMOS VLSI
+  - label: SPEED
+    value: 455 kHz ceramic resonator used as system clock
+  - label: RAM
+    value: 1 KB (544 bytes for Basic programs) up to 2 KB
+  - label: ROM
+    value: 12 KB
+  - label: TEXT MODES
+    value: 1 line x 12 chars plus a 4 digit seven segment display part
+  - label: GRAPHIC MODES
+    value: None
+  - label: COLORS
+    value: Monochrome LCD
+  - label: SOUND
+    value: None
+  - label: SIZE / WEIGHT
+    value: 165 (W) x 71 (D) x 10 (H) mm / 116 g (with batteries)
+  - label: I/O PORTS
+    value: |-
+      12-pin expansion port for printer and cassette interface\
+      11-pin internal slot for memory module
+  - label: POWER SUPPLY
+    value: 2 x CR-2032 lithium batteries
+  - label: PERIPHERALS
+    value: CI-546 cassette interface, and all Casio PB-100 extensions
+  - label: PRICE
+    value: Unknown
+  tabs:
+  - photos
+  photos:
+  - title: 'FRONT VIEW #1'
+    subtitle: ''
+    text: ''
+    image: /media/museum/photos/olympia_op544_system_s2.jpg
+  - title: 'FRONT VIEW #2'
+    subtitle: ''
+    text: ''
+    image: /media/museum/photos/olympia_op544_frontview_s1.jpg
+  - title: OP-644
+    subtitle: ''
+    text: Here connected to the Olympia CI-546 cassette interface, same as the Casio FA-3 interface.
+    image: /media/museum/photos/olympia_op644_system_s1.jpg
+  oc_id: 1001
+  source:
+    url: https://web.archive.org/web/20230608080253/http://www.old-computers.com/museum/computer.asp?c=1001
+    date: '2023-06-08'
+---
+
+The Olympia OP-544 was the same machine as the Casio [PB-100](/museum/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**