---
title: Casio PB-1000
categories:
- Computers
types:
- Pocket
origins:
- Japan
years:
- '1987'
cpus:
- CMOS
params:
  name: PB-1000
  image: /media/museum/photos/casio_pb1000_system_s2.jpg
  company: /companies/casio
  company_name: Casio
  specs:
  - label: NAME
    value: PB-1000
  - label: MANUFACTURER
    value: Casio
  - label: TYPE
    value: Pocket
  - label: ORIGIN
    value: Japan
  - label: YEAR
    value: '1987'
  - label: BUILT IN LANGUAGE
    value: C61 Basic interpreter, Assembler, File Manager, Editor
  - label: KEYBOARD
    value: 64 calculator keys + 13 sensitive keys + 16 LCD sensitive areas
  - label: CPU
    value: CMOS, Hitachi HD61700 8-bit
  - label: SPEED
    value: Unknown
  - label: CO-PROCESSOR
    value: None
  - label: RAM
    value: 8 KB + optional 32 KB RAM card
  - label: ROM
    value: 32 KB + 3 KB included into the CPU
  - label: TEXT MODES
    value: 32 char. x 4 lines (32 x 8 virtual screen)
  - label: GRAPHIC MODES
    value: 193 x 32 pixels
  - label: COLORS
    value: Grey LCD
  - label: SOUND
    value: Buzzer
  - label: SIZE / WEIGHT
    value: 18.7 (W) x 9.7 (H) x 2.4 (D) cm / 390g with batteries
  - label: I/O PORTS
    value: Expansion connector
  - label: POWER SUPPLY
    value: 3 x AA batteries
  - label: PERIPHERALS
    value: MD-100 3.5'' FDD unit, FA-7 tape interface (both devices include a printer port and an RS-232 interface)
  - label: PRICE
    value: Unknown
  tabs:
  - photos
  - hardware
  - emulators
  - links
  forum_thread: 1109
  photos:
  - title: RUNNING
    subtitle: ''
    text: The bottom line displays the menu, the three top lines show the content of the RAM memory.
    image: /media/museum/photos/casio_pb1000_system_s4.jpg
  - title: KEYBOARD CLOSE-UP
    subtitle: ''
    text: ''
    image: /media/museum/photos/casio_pb1000_keyboard_s1.jpg
  - title: CLOSED
    subtitle: ''
    text: The PB-1000 features only one connector, intended for FA-7 and MD-100 expansions.
    image: /media/museum/photos/casio_pb1000_sides_s1.jpg
  - title: INSIDE
    subtitle: ''
    text: |-
      The logic card is located under the keyboard. It supports only the CPU, ROM and RAM chips. Display drivers are located behind the LCD display.

      **(1)** Expansion connector\
      **(2)** Optional RAM card connector\
      **(3)** 8 KB RAM chip (Toshiba TC-5565)\
      **(4)** 32 KB ROM chip (NEC 23C256)\
      **(5)** Hitachi HDS61700 processor.
    image: /media/museum/photos/casio_pb1000_inside_s1.jpg
  hardware:
  - title: FA 10
    subtitle: Plotter and tape interface
    text: The FA-10 offered a 4 colors plotter and a tape interface where you could plug an external tape-recorder or a CM1 Casio tape-recorder.
    image: /media/museum/hardware/casio_pb700_fa10.jpg
  - title: FA-11 INTERFACE
    subtitle: Plotter + Tape recorder
    text: ''
    image: /media/museum/hardware/casio_pb770_fa11-extension.jpg
  emulators:
  - title: PB 1000 emulator
    url: http://www.pisi.com.pl/piotr433/pb1000ee.htm
    platform: Windows
    text: The program emulates the HD61700 microprocessor and uses the ROM dump from the original calculator, therefore it should function almost exactly like the real one.
  links:
  - title: Andreas Wichmann's page
    url: http://www.itkp.uni-bonn.de/~wichmann/pb1000.html
    text: lots of useful information and links about the PB-1000
  - title: Casio PB-1000
    url: http://homepage3.nifty.com/lsigame/pb-1000/pb-1000.htm
    text: Very interesting site (in Japanese)
  - title: Silrun Systems - The home of programmable Casio pocket calculators
    url: http://www.silrun.de/
    text: German and English zipped manuals
  oc_id: 1139
  source:
    url: https://web.archive.org/web/20230608154227/http://www.old-computers.com/museum/computer.asp?c=1139
    date: '2023-06-08'
---

The Casio PB-1000 was an original, well designed and powerful pocket computer for its time.

On top of its standard QWERTY keyboard, a row of sensitive keys allowed fast scientific calculations, menus access and text editing. The 4-line LCD display also had 16 sensitive areas.

The computer could be programmed either in Basic or Assembly language. The C61 Basic interpreter, based on Japan Industrial Standard BASIC, had a wide range of built-in mathematic, trigonometric and statistic functions. Assembly programs had to be typed by using the built-in editor then compiled. The user's manual gave little information about CPU instructions and, oddly enough, Casio and it's distributors never released a full description of the whole CPU's instructions set, although Casio published an incomplete "Technical Reference Manual".

The processor was an Hitachi HDS61700. It contained a small amount of ROM and RAM, as well memory management and I/O circuitry. The memory was managed like a virtual disk. Several Basic or Assembly programs as well as ASCII text could be stored together in the same RAM area.

Two extensions were released for the PB-1000, the FA-7 Serial, Parallel and tape recorder interface, and the rare MD-100 3.5" floppy drive unit.

The PB-1000 was followed by the **PB-2000** which lost the lift up display but had the unique feature of being programmable in ANSI C language.