Sharp PC-1403

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Sharp PC-1403
Sharp pc 1403.jpg
Sharp PC-1403 handheld BASIC computer
Type Pocket computer
Introduced 1986
Entry mode Infix, BASIC,
Display type LCD dot-matrix
Display size 24 characters
Processor CPU: Hitachi SC61860 (8-bit CMOS)
Frequency 768 kHz
Programming language(s) Unstructured BASIC
User memory 8 KB
Firmware memory 72 KB
Ports 1x proprietary (11 pins)
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[edit]

Sharp PC-1403H front.jpg
Sharp PC-1403H rear.jpg
  • 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.


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


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

Programming example[edit]

Here is a sample program that computes the factorial of an integer number from 2 to 69. It can be called by pressing DEF F in run mode. The program is 66 bytes long.

10 "F"                                 ''allows to start the program with DEF F
20 INPUT "N=?";N                       ''Ask for n
30 LET F=1                             ''Set start value if F to 1
40 FOR I=1 TO N STEP 1                 ''counts I from 1 to N
50 LET F=F*I                           ''calculates F=F*I
60 NEXT I                              ''repeats loop from line 40
70 PRINT USING "##";N;"!="; USING ;F   ''print result - i.E. 5!=120
80 END                                 ''end off program