Back to index

Info for pc1251


====== Sharp Pocket Computer 1251 (1982) ======




===== Features =====

* CPU: CMOS SC61860 (8 bits) 576 kHz
* RAM: 4 KB
* ROM: 24 KB
* Text Modes: 1 line x 24 char. 5 x 7 dot matrix
* Graphic Modes: None
* Colors: Monochrome LCD
* Sound: CPU controlled piezo buzzer, fixed frequency and duration via BASIC statement
* I/O Ports: Proprietary 11-pin expansion bus
* Keyboard: 52 keys, QWERTY calculator type with numeric key-pad
* Built In Language: BASIC interpreter
* Peripherals: CE-126P thermal printer, CE-124 Tape recorder interface, CE-125 Thermal printer and micro cassette recorder



===== Known Issues =====

The emulation of this system is still Preliminary.

MESS also supports the emulation of the Tandy TRS80 PC-3 as a TESTDRIVER, i.e. not included in the pre-compiled MESS you find at mess.org -- http://www.mess.org



===== History and Trivia =====

Small pocket computer. Also marketed as Tandy TRS80 PC-3.

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 and PC-1500 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.

//(info from old-computers.com)//



===== Links =====

* Pocket Computer Museum -- http://pocket.free.fr/index.html
* Pocket Computer 1251 at old-computers.com -- http://old-computers.com/museum/computer.asp?c=1091



===== Other Emulators =====

* PockEmul -- http://pockemul.free.fr/
* POEMS -- http://sourceforge.jp/projects/poems/




Generated on Sun Jul 19 10:17:28 2009