--- title: Sharp PC-1250 PC-1251 categories: - Computers types: - Pocket origins: - Japan years: - '1982' cpus: - CMOS SC61860 params: name: PC-1250 PC-1251 image: /media/museum/photos/sharp_pc1251_system_s1.jpg company: /companies/sharp company_name: Sharp specs: - label: NAME value: PC-1250 PC-1251 - label: MANUFACTURER value: Sharp - label: TYPE value: Pocket - label: ORIGIN value: Japan - label: YEAR value: '1982' - label: BUILT IN LANGUAGE value: BASIC interpreter - label: KEYBOARD value: 52 keys, QWERTY calculator type with numeric key-pad - label: CPU value: CMOS SC61860 (8 bits) - label: SPEED value: 576 kHz - label: RAM value: 4 KB - label: ROM value: 24 KB - label: TEXT MODES value: 1 line x 24 char. 5x7 dot matrix - label: GRAPHIC MODES value: None - label: COLORS value: Monochrome LCD - label: SOUND value: CPU controlled piezo buzzer, fixed frequency and duration via BASIC statement - label: SIZE / WEIGHT value: 135 (W) x 70 (D) x 9.5 (H) mm / 115 g (with batteries) - label: I/O PORTS value: Proprietary 11-pin expansion bus - label: POWER SUPPLY value: 6 volts, 2 x CR 2032 lithium cells - label: PERIPHERALS value: |- CE-126P thermal printer\ CE-124 Tape recorder interface\ CE-125 Thermal printer and micro cassette recorder - label: PRICE value: About 340 (Germany, 09.1982) tabs: - photos - emulators - links - docs forum_thread: 1061 photos: - title: LARGE VIEW subtitle: '' text: '' image: /media/museum/photos/sharp_pc1251_system_s2.jpg - title: FRONT VIEW subtitle: '' text: '' image: /media/museum/photos/sharp_pc1251_frontview_s1.jpg - title: BOTH SIDES subtitle: '' text: Note the contrast adjustment button on the right side and the 11-pin expansion connector (covered by a plastic lid) on the left side. image: /media/museum/photos/sharp_pc1251_sides_s1.jpg - title: BACK SIDE subtitle: '' text: '' image: /media/museum/photos/sharp_pc1251_back%20side_s1.jpg - title: IN ITS PLASTIC CASE subtitle: '' text: '' image: /media/museum/photos/sharp_pc1251_incase_s1.jpg - title: COMPLETE SYSTEM subtitle: '' text: Complete system in its carrying case, with the CE-126P - printer and cassette interface. The small housing alowed to carry the AC adaptor, spare cassettes tapes and paper rolls. image: /media/museum/photos/sharp_pc1251_compsystem_s1.jpg - title: THE ELECTRONICS subtitle: '' text: |- The components side of the main card actually faces the plastic part and memory card. **(1)** Reset switch\ **(2)** Battery cell connectors\ **(3)** LCD contrast button\ **(4)** SC43536 display driver\ **(5)** 11-pin expansion connector\ **(6)** SC61860 CPU\ **(7)** Piezzo buzzer\ **(8)** Memory card connector Memory card:\ **(9)** Toshiba TC5517 2Kx8-bit RAM chips (HM6116 equivalent)\ **(10)** LH532916 24 KB ROM chip. Holds the BASIC interpreter. image: /media/museum/photos/sharp_pc1251_inside_s1.jpg - title: PC 1253 subtitle: '' text: |- The PC 1253 was an OEM version of the PC 1251. It had a reduced keyboard and ran a pre-installed program. This French model was used to draw up estimates in the building trade. A PC-1252 (similar desing but 2 KB of RAM) was also released. image: /media/museum/photos/sharp_pc1253_system_s1.jpg emulators: - title: POEMS url: http://sourceforge.jp/projects/poems/ platform: Unix / Linux text: PC-12xx, 14xx & 13xx emulator - title: PockEmul url: http://pockemul.free.fr/ platform: Multiplatform text: Emulates nearly all Sharp pocket computers! links: - title: Web Wiz CAPTCHA url: http://www.webwizcaptcha.com text: '' docs: - title: SHARP PC-1251 - INSTRUCTION MANUAL url: http://www.usersmanualguide.com/sharp/calculator/pc-1251 cover: /media/museum/docs/couvs/sharp-1251_user-manual.jpg text: |- [**SHARP PC-1251 - INSTRUCTION MANUAL**](http://www.usersmanualguide.com/sharp/calculator/pc-1251)written by Sharp  type of document : PDF\  size : 3.65 MB\  source : [UsersManualGuide.com](http://usersmanualguide.com) - title: SHARP PC-1250/CE-125 APPLICATION SOFTWARE PROGRAM EXAMPLES url: null cover: /media/museum/docs/couvs/pc1250ap.jpg text: |- **SHARP PC-1250/CE-125 APPLICATION SOFTWARE PROGRAM EXAMPLES**\ written by Sharp  compiled/archived by James L. Dunlap, Jr\  type of document : PDF\  size : 1,8 MB **... READ THE ONLINE VERSION BY CLICKING BELOW :** related: - /museum/sharp-pc-1210-1211-1212 - /museum/sharp-pc-1245 - /museum/sharp-pc-1260-pc-1261-pc-1262 - /museum/sharp-pc-1401-pc-1402-pc-1421 - /museum/sharp-pc-1403-h - /museum/sharp-pc-1500-pc-1500a - /museum/sharp-pc-2500 oc_id: 1091 source: url: https://web.archive.org/web/20230608151812/http://www.old-computers.com/museum/computer.asp?c=1091 date: '2023-06-08' --- With the PC-1251, Sharp started off their product range of really tiny pocket computers. It was the third original design after the [PC-121x](/museum/sharp-pc-1210-1211-1212/) and [PC-1500](/museum/sharp-pc-1500-pc-1500a/) series. Contrary to its predecessors, it was really pocket sized, measuring only 135 x 70 x 9.5 mm. Nevertheless, it featured a 24 character display, and with 4 KB RAM it even outclassed the PC-1500 basic version. The major drawback of the new design was that the tiny keys are only compatible with pointed fingers. The PC-1251 was based on a new 8-bit CMOS micro processor, the SC61860, which was mounted on the main PCB together with the display driver chip SC43536. On an additional small PCB, 24 KB ROM (LH532917) and 4 KB RAM (two HM6116 2k x 8 chips) were located. A new feature was the so-called "reserve memory" which allowed to assign often used BASIC commands or functions to 18 of the alphanumeric keys. Together with the PC-1251, the CE-125 thermal printer and micro cassette recorder unit was introduced. With integrated NiCd accumulators, it was fully mains independent and made the 1251 into a very compact mobile computing system. The CE-125 also featured an additional tape interface for external tape recorders. The PC-1250 was the same machine as the PC-1251 but with only 2 KB of RAM. Thanks to **Roman von Wartburg** and his [site](http://retrocomputing.ch/) for information and picture.