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S > SHARP  > PC-1250 PC-1251   

PC-1250 PC-1251

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.

Thanks to Roman von Wartburg and his site for information and picture.

NAME  PC-1250 PC-1251
TYPE  Pocket
YEAR  1982
KEYBOARD  52 keys, QWERTY calculator type with numeric key-pad
CPU  CMOS SC61860 (8 bits)
SPEED  576 kHz
ROM  24 KB
TEXT MODES  1 line x 24 char. 5x7 dot matrix
COLORS  Monochrome LCD
SOUND  CPU controlled piezo buzzer, fixed frequency and duration via BASIC statement
SIZE / WEIGHT  135 (W) x 70 (D) x 9.5 (H) mm / 115 g (with batteries)
I/O PORTS  Proprietary 11-pin expansion bus
POWER SUPPLY  6 volts, 2 x CR 2032 lithium cells
PERIPHERALS  CE-126P thermal printer
CE-124 Tape recorder interface
CE-125 Thermal printer and micro cassette recorder
PRICE  About 340 (Germany, 09.1982)

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