An (i) for an i—29C’s usage

[Matt Agajanian]

Hi all

As the 67 uses I for the storage directly into the I register and (i) was the indirection usage, why was the 19/29C’s i operator used for indirection operations (GTO i GSB i), etc.) and not (i) like the 67/97?

Thanks

[Thomas Okken]

On the 19C/29C, the I register is register 0. I assume that the HP designers felt that the distinction between 0 and i was clear enough without using parentheses as a hint that indirect addressing is happening.

[Matt Agajanian]

(08-24-2019 12:00 AM)Thomas Okken Wrote:  On the 19C/29C, the I register is register 0. I assume that the HP designers felt that the distinction between 0 and i was clear enough without using parentheses as a hint that indirect addressing is happening.

I hadn’t thought of that. That train of thinking helps me put things in perspective.

Thanks

[Archilog]

Hello,
As an old user of the 29c (since 83), I never have had problems to use those two sides of the Indirect Register; the reciprocal is not true: when I many years later acquired a 67, the use of I or (i) were - and nowadays is - problematic.

[Matt Agajanian]

Archilog, ‘Problematic’? Please explain.

Thanks