Programming
The programming model employed was key stroke programming by which each key pressed was recorded and later played back. On record multiple key presses where merged into in a single programming step. There were only a very few operations which needed two bytes.
The FX-603P could store 6,144 steps. Data could be stored in 110 memory register. The FX-603P series supported 20 labels for programs and subroutines called P0 .. P19 - twice the amount of the predecessor models. Each program or subroutine could have up to 10 local labels called LBL0 .. LBL9 for jumps and branches.
The FX-603P supported indirect addressing both for memory access and jumps and therefore programming model could be considered Turing complete.
The FX-603P was upward compatible to the FX-602P could load FX-602P programs from Compact Cassette.
Read more about this topic: Casio FX-603P
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