Casio FX-603P

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Casio FX-603P was a programmable scientific calculator released by Casio in 1990 as the successor to the FX-602P. It was sold in limited quantities in a few countries, making it rare and expensive today.

Display and memory
- Main display: two-line dot-matrix LCD with 16 characters per line
- Additional display: a 4-digit 7-segment display shows the program step when entering or debugging
- 20 status indicators
- Memory: up to 6,144 program steps and 110 data registers

Programming
- Keystroke programming: every key press is recorded and can be played back
- Most programming steps are a single byte, with few two-byte operations
- Labels: 20 program labels P0–P19 and up to 10 local labels LBL0–LBL9 for jumps
- Indirect addressing: memory access and jumps are indirect, giving the system a Turing-complete capability
- Backward compatible with FX-602P and can load FX-602P programs from Compact Cassette

Sample program
- Factorial example: entering 5 P0 computes 5! = 120
- If alpha output is enabled, the program is 14 bytes long

Interfaces and power
- Interface: FA-6, shared with other Casio models, providing Compact Cassette, Centronics printer, and RS-232 PC connections
- Power: three CR-2032 lithium cells
- Weight: about 141 g
- Dimensions: ~15.2 x 7.6 x 1.2 cm (6" x 3" x 0.5")