--- title: Casio PB-100 categories: - Computers types: - Pocket origins: - Japan years: - '1982' cpus: - HD61913 CMOS VLSI params: name: PB-100 image: /media/museum/photos/casio_pb100_system_s1.jpg company: /companies/casio company_name: Casio specs: - label: NAME value: PB-100 - label: MANUFACTURER value: Casio - 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: |- OR-1 1 kB RAM PACK\ FA-3 cassette interface\ FP-12 mini thermal printer - label: PRICE value: 63 (France, Dec. 1984) tabs: - photos - adverts - hardware - links - docs - videos forum_thread: 974 photos: - title: LARGE VIEW subtitle: '' text: '' image: /media/museum/photos/casio_pb100_system_s2.jpg - title: FRONT VIEW subtitle: '' text: '' image: /media/museum/photos/casio_pb100_frontview_s1.jpg - title: INSIDE THE PB-100 subtitle: '' text: |- **(1)** LCD display\ **(2)** HD61913 main chip\ **(3)** HD61914 1 KB static RAM chip\ **(4)** Expansion connector\ **(5)** Optional 1 KB RAM card connector\ **(6)** LCD contrast knob image: /media/museum/photos/casio_pb100_inside_s1.jpg - title: MANUALS subtitle: '' text: German user and programming manuals image: /media/museum/photos/casio_pb100_manuals_s1.jpg adverts: - title: FRENCH AD (SEPT. 1983) subtitle: '' text: '"Casio. Basic, it''s magic"' image: /media/museum/pubs/casio_pb100_pub_magique_2.jpg hardware: - title: CASSETTE INTERFACE subtitle: '' text: '' image: /media/museum/hardware/casio_pb100_fa3%20interf_s1.jpg links: - title: Silrun Systems url: http://www.silrun.info/ text: Documentations to download for Casio pockets ! Useful. - title: The Pocket Computer Museum url: http://pocket.free.fr/ text: The site to visit for pockets computers ! docs: - title: CASIO PB-100 FRENCH USER MANUAL url: http://www.ledudu.com/images/pockets/casio/broche/pb100.pdf cover: /media/museum/docs/couvs/casio_pb100_userdoc_french.jpg text: |- [**CASIO PB-100 FRENCH USER MANUAL**](http://www.ledudu.com/images/pockets/casio/broche/pb100.pdf)written by Casio  compiled/archived by www.ledudu.com\  type of document : PDF\  size : 9,8 MB\  source : [www.ledudu.com](http://www.ledudu.com) **... READ THE ONLINE VERSION BY CLICKING BELOW :** - title: 60 PROGRAMMES POUR CASIO PB-100 url: http://www.ledudu.com/images/pockets/casio/broche/60programmesspourpb100.pdf cover: /media/museum/docs/couvs/casio_pb100_60progs.jpg text: |- [**60 PROGRAMMES POUR CASIO PB-100**](http://www.ledudu.com/images/pockets/casio/broche/60programmesspourpb100.pdf)written by Gilles Probst  compiled/archived by www.ledudu.com\  type of document : PDF\  size : 4,1 MB\  source : [www.ledudu.com](http://www.ledudu.com) **... READ THE ONLINE VERSION BY CLICKING BELOW :** videos: - title: Casio PB-100 japanese commercial url: https://www.youtube.com/watch?v=-2pD6g66Erc text: 'Length: 14 s' related: - /museum/casio-fx-700p - /museum/casio-fx-702p - /museum/casio-pb-300 oc_id: 1000 source: url: https://web.archive.org/web/20230609171653/http://www.old-computers.com/museum/computer.asp?c=1000 date: '2023-06-09' --- The PB-100 represents Casio's step towards "real" pocket computers. While its ancestor, the [FX-702P](/museum/casio-fx-702p/), was still called "Programmable Calculator", the PB-100 proudly bears the title "Personal Computer". However, the PB-100 seems to have been a true low-cost design. Its specifications are clearly inferior to those of its predecessor, the FX-702P, as well as to SHARP's earlier pockets. The limited 12 character display makes BASIC programming and debugging a painstaking endeavor. In its standard version, it is equipped with 1 KB of RAM which results in only 544 bytes for BASIC, which is really limiting. At least, with the memory module OR-1, it can be upgraded to 1568 bytes of user memory, so it begins to make sense that BASIC memory can be subdivided into 10 independent program areas P0-P9. Moreover, the keyboard had been reduced to the absolute minimum; at any rate, it provided a QWERTY style layout (the FX-702P had a non-standard alphabetical layout).\ On the other hand, the cute little machine is really small and lightweight, a real pocket device. The main circuits of the PB-100 are basically made up of two chips. Processor logics, ROM, display driver, and keyboard controller are integrated in a single CMOS VLSI chip HD61913, which has an external 4-bit bus. The second main component is a HD61914, which is a 8192-bit static RAM organized as 2048 words by 4 bits. In 1983, the PB-100 was also released by Tandy Radio Shack as [TRS-80 PC-4](/museum/tandy-radio-shack-trs-80-pc-4/) and by Olympia as [OP-544](/museum/olympia-op-544-op-644/). Thanks to **Roman von Wartburg** ([retrocomputing.ch](http://retrocomputing.ch/)) for this information. --- PB-100 vs mainframe by **Richard Chequer**:\ I have a Casio PB-100 (with the optional OR-1 memory) which I have owned and used since 1983.\ I have shadowed mainframe programs (pension calculations) using the PB-100. A work colleague would code the mainframe solution and I would do the equivalent with the Casio: if the answers agreed, the mainframe code was deemed correct.\ The limitations of the display do mean that you have to write any potential program out on paper prior to typing it in. I have not had many problems with the limited memory: it is not designed for running large programs.\ The only limitation in the code is that there is no "ELSE" construct on IF statements. This did not limit the programming, but the coding required was less elegant and compact than if this construct was implemented.\ I still use the machine today and I consider it to be much easier to use than a programmable calculator. In terms of maintenance it has only required new batteries - and not too many of those, either!