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Sharp PC-1403
	Sharp PC-1403 handheld BASIC computer
Type	Pocket computer
Introduced	1986
Calculator
Entry mode	Infix, BASIC,
Display type	LCD dot-matrix
Display size	24 characters
CPU
Processor	CPU: Hitachi SC61860 (8-bit CMOS)
Frequency	768 kHz
Programming
Programming language(s)	Unstructured BASIC
User memory	8 KB
Firmware memory	72 KB
Interfaces
Ports	1x proprietary (11 pins)
Other
Power supply	2x CR2032
Power consumption	0.03 W

The Sharp PC-1403 was a small scientific calculator and pocket computer manufactured by Sharp. It was the successor of the Sharp PC-1401, and had better display, more RAM and better system software.

Technical specifications

CPU: Hitachi SC61860 (8-bit CMOS) 768 kHz
Memory: 8 KB RAM (6863 bytes available), 72 KB ROM; 32 KB RAM in PC-1403H model
Display: Monochrome LCD 1 line with 24 5×7 characters
Power: 6 V DC - 2× CR2032, 0.03 W
Connector (11 pins) for external devices
Integrated speaker (4 kHz beep only)
Contrast adjustment wheel
Software: Simple BASIC interpreter; calculator mode
Matrix calculations

Manufacturing started in 1986.

It is possible to convert the 1403 to a 1403H by removing the 8 K RAM and soldering in a 32 K RAM. An inverter IC is needed for this, too.

Calculator

Calculations could be performed in two modes CAL and RUN.^[1] In the former, the PC-1403 would behave like a normal scientific calculator at the time with formulas entered in algebraic logic. In RUN mode, BASIC statements could be entered for immediate execution and print out. The latter was similar to the Direct algebraic logic employed by modern calculators.

Programming

The programming model employed was unstructured BASIC for which the PC-1403 distinguished between RUN and PRO mode. The later being used to enter and edit program and the former being used to execute them.

Programming example

Here is a sample program that computes the factorial of an integer number from 0 to 69. It can be called by entering a number or an expression followed by pressing DEF F (in run mode).

10 "F" AREAD N                         ''allows to start the program with <expression> DEF F
20 F=1                                 ''Set start value of F to 1
30 FOR I=1 TO N                        ''counts I from 1 to N
40 F=F*I                               ''calculates F=F*I
50 NEXT I                              ''repeats loop from line 40
60 PRINT STR$ N+"!=";F                 ''print result - i.e. 5!=120.
70 END                                 ''end of program