yann64andClaude Opus 5.5
b274874139
1,289 discussions, 9,527 archived comments; pages no longer carry the comments themselves. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ
178 lines
6.4 KiB
Markdown
178 lines
6.4 KiB
Markdown
---
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title: Sharp PC-1250 PC-1251
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categories:
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- Computers
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types:
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- Pocket
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origins:
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- Japan
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years:
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- '1982'
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cpus:
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- CMOS SC61860
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params:
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name: PC-1250 PC-1251
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image: /media/museum/photos/sharp_pc1251_system_s1.jpg
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company: /companies/sharp
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company_name: Sharp
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specs:
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- label: NAME
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value: PC-1250 PC-1251
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- label: MANUFACTURER
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value: Sharp
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- label: TYPE
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value: Pocket
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- label: ORIGIN
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value: Japan
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- label: YEAR
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value: '1982'
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- label: BUILT IN LANGUAGE
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value: BASIC interpreter
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- label: KEYBOARD
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value: 52 keys, QWERTY calculator type with numeric key-pad
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- label: CPU
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value: CMOS SC61860 (8 bits)
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- label: SPEED
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value: 576 kHz
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- label: RAM
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value: 4 KB
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- label: ROM
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value: 24 KB
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- label: TEXT MODES
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value: 1 line x 24 char. 5x7 dot matrix
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- label: GRAPHIC MODES
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value: None
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- label: COLORS
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value: Monochrome LCD
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- label: SOUND
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value: CPU controlled piezo buzzer, fixed frequency and duration via BASIC statement
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- label: SIZE / WEIGHT
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value: 135 (W) x 70 (D) x 9.5 (H) mm / 115 g (with batteries)
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- label: I/O PORTS
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value: Proprietary 11-pin expansion bus
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- label: POWER SUPPLY
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value: 6 volts, 2 x CR 2032 lithium cells
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- label: PERIPHERALS
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value: |-
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CE-126P thermal printer\
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CE-124 Tape recorder interface\
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CE-125 Thermal printer and micro cassette recorder
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- label: PRICE
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value: About 340 (Germany, 09.1982)
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tabs:
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- photos
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- emulators
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- links
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- docs
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forum_thread: 1061
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photos:
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- title: LARGE VIEW
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subtitle: ''
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text: ''
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image: /media/museum/photos/sharp_pc1251_system_s2.jpg
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- title: FRONT VIEW
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subtitle: ''
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text: ''
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image: /media/museum/photos/sharp_pc1251_frontview_s1.jpg
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- title: BOTH SIDES
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subtitle: ''
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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.
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image: /media/museum/photos/sharp_pc1251_sides_s1.jpg
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- title: BACK SIDE
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subtitle: ''
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text: ''
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image: /media/museum/photos/sharp_pc1251_back%20side_s1.jpg
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- title: IN ITS PLASTIC CASE
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subtitle: ''
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text: ''
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image: /media/museum/photos/sharp_pc1251_incase_s1.jpg
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- title: COMPLETE SYSTEM
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subtitle: ''
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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.
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image: /media/museum/photos/sharp_pc1251_compsystem_s1.jpg
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- title: THE ELECTRONICS
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subtitle: ''
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text: |-
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The components side of the main card actually faces the plastic part and memory card.
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**(1)** Reset switch\
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**(2)** Battery cell connectors\
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**(3)** LCD contrast button\
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**(4)** SC43536 display driver\
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**(5)** 11-pin expansion connector\
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**(6)** SC61860 CPU\
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**(7)** Piezzo buzzer\
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**(8)** Memory card connector
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Memory card:\
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**(9)** Toshiba TC5517 2Kx8-bit RAM chips (HM6116 equivalent)\
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**(10)** LH532916 24 KB ROM chip. Holds the BASIC interpreter.
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image: /media/museum/photos/sharp_pc1251_inside_s1.jpg
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- title: PC 1253
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subtitle: ''
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text: |-
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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.
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A PC-1252 (similar desing but 2 KB of RAM) was also released.
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image: /media/museum/photos/sharp_pc1253_system_s1.jpg
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emulators:
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- title: POEMS
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url: http://sourceforge.jp/projects/poems/
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platform: Unix / Linux
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text: PC-12xx, 14xx & 13xx emulator
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- title: PockEmul
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url: http://pockemul.free.fr/
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platform: Multiplatform
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text: Emulates nearly all Sharp pocket computers!
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links:
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- title: Web Wiz CAPTCHA
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url: http://www.webwizcaptcha.com
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text: ''
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docs:
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- title: SHARP PC-1251 - INSTRUCTION MANUAL
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url: http://www.usersmanualguide.com/sharp/calculator/pc-1251
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cover: /media/museum/docs/couvs/sharp-1251_user-manual.jpg
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text: |-
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[**SHARP PC-1251 - INSTRUCTION MANUAL**](http://www.usersmanualguide.com/sharp/calculator/pc-1251)written by Sharp
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type of document : PDF\
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size : 3.65 MB\
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source : [UsersManualGuide.com](http://usersmanualguide.com)
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- title: SHARP PC-1250/CE-125 APPLICATION SOFTWARE PROGRAM EXAMPLES
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url: null
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cover: /media/museum/docs/couvs/pc1250ap.jpg
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text: |-
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**SHARP PC-1250/CE-125 APPLICATION SOFTWARE PROGRAM EXAMPLES**\
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written by Sharp
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compiled/archived by James L. Dunlap, Jr\
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type of document : PDF\
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size : 1,8 MB
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**... READ THE ONLINE VERSION BY CLICKING BELOW :**
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related:
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- /museum/sharp-pc-1210-1211-1212
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- /museum/sharp-pc-1245
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- /museum/sharp-pc-1260-pc-1261-pc-1262
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- /museum/sharp-pc-1401-pc-1402-pc-1421
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- /museum/sharp-pc-1403-h
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- /museum/sharp-pc-1500-pc-1500a
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- /museum/sharp-pc-2500
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oc_id: 1091
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source:
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url: https://web.archive.org/web/20230608151812/http://www.old-computers.com/museum/computer.asp?c=1091
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date: '2023-06-08'
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---
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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.
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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.
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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.
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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.
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The PC-1250 was the same machine as the PC-1251 but with only 2 KB of RAM.
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Thanks to **Roman von Wartburg** and his [site](http://retrocomputing.ch/) for information and picture.
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