TI 58/59 ROM modules and OP instructions

[rprosperi]

(12-30-2017 07:43 AM)Dieter Wrote:  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?

This is a good question, thanks for posting the examples Dieter. I ran across this last year when I got a TI-58C with a couple ROM modules and looked at some of the library functions.

Not having used a 58/59 back in the day, I had no background on the OP commands, and guessed they are not used in programs as they are much slower than the equivalent commands used to replace them (recalling how obsessed with program speed everyone was).

Or possibly programs in ROM could not access the OP commands, due to some internal architectural limitation? Anyhow, I look forward to reading answers here.