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TI 58/59 ROM modules and OP instructions
12-30-2017, 07:43 AM
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TI 58/59 ROM modules and OP instructions
I have been looking at some programs in the TI58/59 ML-01 master library module, and there is a detail that makes makes me wonder: There are numerous places where the OP 2x and OP 3x instructions that increment / decrement a data register would have made sense, but instead a more elaborate command sequence has been used, like x<>t 1 INV SUM 01 x<>t instead of a simple OP 31. In a similar way the sign function OP 10 is avoided, instead this is accomplished by dividing x by its absolute value (which also requires special care for x=0).

So it looks like the OP commands are deliberately avoided in TI's ROM modules. But why? Is there a certain technical reason for this?

Dieter
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TI 58/59 ROM modules and OP instructions - Dieter - 12-30-2017 07:43 AM



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