Documentation bug in original 15C manual

[BruceH]

I couldn't find a list of known bugs in the original manual so sorry if this is not new.

Only minor but page 24 of the 15C Owners Handbook says "Pressing [g][pi] places the first
10 digits of pi into the calculator."

However, strictly speaking, the calculators (both original and LE) do not do this. Instead [g][pi] places a rounded to 10 digits approximation to Pi into the calculator. (And the example on page 62 gets this right.)

[Luiz C. Vieira (Brazil)]

I'd also add that the digits are placed in the X-register, not into the calculator as in some unknown place... (I still have my head back in the 80's, when manuals usually cleared issues instead of bringing them in...)

[Mark Storkamp]

Quote:

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I couldn't find a list of known bugs in the original manual so sorry if this is not new.

Only minor but page 24 of the 15C Owners Handbook says "Pressing [g][pi] places the first
10 digits of pi into the calculator."

However, strictly speaking, the calculators (both original and LE) do not do this. Instead [g][pi] places a rounded to 10 digits approximation to Pi into the calculator. (And the example on page 62 gets this right.)

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Actually, it doesn't put it into the calculator either. It's already there. Rather it moves it into the X register. Or better yet it makes a copy of the constant rounded to 10 places and puts it into the X register, which is really a BCD representation of the decimal number system, and not the actual number itself. (assuming of course it doesn't calculate it on the fly)

[Luiz C. Vieira (Brazil)]

Quote:

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(...) BCD representation of the decimal number system, and not the actual number itself. (assuming of course it doesn't calculate it on the fly)

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Interesting perspective... If we are talking about memory usage versus program instructions (time to compute being a factor, too), how many digits of a constant (two digits = 1 byte) would be worth computing instead of storing in system memory? There must be a break even point...

Cheers.

Luiz (Brazil)

Edited: 1 May 2012, 6:55 p.m.

[Steve Simpkin]

Quote:

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... how many digits of a constant (two digits = 1 byte) would be worth computing instead of storing in system memory?

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42

(Sorry, couldn't resist)

[Luiz C. Vieira (Brazil)]

Long Live 'The Hitch Hikers' (it will end in tears...)

(neither could I)

GREAT! Loved it!

Edited: 1 May 2012, 9:27 p.m.

[Mike Morrow]

So that's why I've been getting all those wrong answers! :-)