The Sharp PC-1500 was a pocket computer

Pocket computer

A pocket computer is a small calculator-sized handheld programmable computer.This specific category of computers existed primarily in the 1980s. Manufacturers included Casio, Hewlett-Packard, Sharp, Tandy/Radio Shack and many more.The programming language was usually BASIC, but some devices...

 produced by Sharp

Sharp Corporation

is a Japanese multinational corporation that designs and manufactures electronic products. Headquartered in Abeno-ku, Osaka, Japan, Sharp employs more than 55,580 people worldwide as of June 2011. The company was founded in September 1912 and takes its name from one of its founder's first...

 in 1982. A clone was sold as the TRS-80 PC-2

Tandy Pocket Computer

A Tandy Pocket Computer is one of a line of 1980s small pocket computers—calculator-sized programmable computing devices—sold primarily under the Tandy or Radio Shack brands, but were actually rebadged Sharp and Casio devices with different model names. They were given designations from...

. The whole computer was designed around the LH5801, an 8-bit

8-bit

The first widely adopted 8-bit microprocessor was the Intel 8080, being used in many hobbyist computers of the late 1970s and early 1980s, often running the CP/M operating system. The Zilog Z80 and the Motorola 6800 were also used in similar computers...

 CPU similar to the Zilog

Zilog

Zilog, Inc., previously known as ZiLOG , is a manufacturer of 8-bit and 24-bit microcontrollers, and is most famous for its Intel 8080-compatible Z80 series.-History:...

 Z80, but all laid-out in power-saving CMOS circuits. The programming language

Programming language

A programming language is an artificial language designed to communicate instructions to a machine, particularly a computer. Programming languages can be used to create programs that control the behavior of a machine and/or to express algorithms precisely....

 was BASIC

BASIC

BASIC is a family of general-purpose, high-level programming languages whose design philosophy emphasizes ease of use - the name is an acronym from Beginner's All-purpose Symbolic Instruction Code....

. Later German engineers cracked the system and also provided an assembler

Assembly language

An assembly language is a low-level programming language for computers, microprocessors, microcontrollers, and other programmable devices. It implements a symbolic representation of the machine codes and other constants needed to program a given CPU architecture...

 for the machine. Later even a C compiler followed.
An external memory module slot was available.