Grumpy

(all hex values)

Is, E7A, minus 820, equal to 65A?

Willie

iTrader: (1)

I just happen to still have an old solar powered Casio calculator, Model fx-995, which is as flat as a credit card. It has the ability to calculate stuff in binary, octadecimal (is this the proper term?) and hexadecimal.

The answer is YES. Any more?

Willie

Grim Reaper

Yes, and it cross checks back into decimal:

E7A = 3706
820 = 2080
65A = 1626

Grim Reaper

I had to do mine by hand.

Willie

iTrader: (1)

Hey Glenn,

You mean you don't have an abacus or slide rule? Excuse me while I go watch a movie on Beta....

Grim Reaper

Actually, I do have a slide rule but it's in decimal and log only. I had to use it in high school.

Hand calculators were just coming out, you were not permitted to use them in exams, cost hundreds of dollars, size of a suitcase and required 220v.

Grumpy

Thanks for the double check.

Kids......

First computer I used took 4 guys to carry and used a 12 Kw generator. And the display was Nixie tubes. Nice soft orange display <G>. Called a FADAC, Field Artillery Digital Automatic Computer. It was truely state of the art at the time.....

11sORbust

I'm slowly learning assembly, why does 820 = 2080?

jwscab

if you guys are using computers that are windows based, you can open up the calculator, put it into scientific mode, click the hex button, type your number in hex, then click the decimal button, and wha-la, your hex number in decimal. simple as pie......as a matter of fact, just use the calculator in hex mode to do all your math.

so.....820(hex) = 2080 decimal. not really related to assembly at all.

AlexJH

Hexadecimal is a 16- based numbering system (what we'd use if we had 16 fingers).

The numbers go 0123456789ABCEDF

To do it by hand, you say 8*16^2 + 2*16^1 + 0*16^0

(16^0 = 1)

2048 + 32 = 2080 decimal.

If you're getting into assembly, I highly recommend buying the book, 'Bebop to the Boolean boogie' because it explains tons of things about how computers do math. Lame name, I know, but it's really a great book.

I think this link will get you to it:

http://www.amazon.com/exec/obidos/AS...055294-8367810

JP86SS

iTrader: (1)

You guys don't have 16 fingers?
I thought for sure a couple of them did the way they can count so quick.

http://tunerpro.markmansur.com/
goto support/white papers/ understanding hex

Thanks to Mark for putting this together.
Helps to keep us "HexaDummies" in proper order

Grumpy

If you count toes and fingers, Sleepy, and Sneezy have 16 that way.

305q_ta86

iTrader: (1)

Apeiron

If you ever want to part with that, let me know, I have a collection.