RE: what is Hex?
- From: "Macarty, Jay {PBSG}" <Jay.Macarty@xxxxxxxx>
- To: <programmingblind@xxxxxxxxxxxxx>
- Date: Wed, 20 Feb 2008 17:31:51 -0600
When I worked on the HP 3000, we used octal notation to represent a 24
bit value in 8 octal digits (3 bits per octal number). Can't recall if
that was because of the register size, the addressing base, the word
boundary, all the above, or what.
-----Original Message-----
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Dale Leavens
Sent: Wednesday, February 20, 2008 3:01 PM
To: programmingblind@xxxxxxxxxxxxx
Subject: Re: what is Hex?
You use two octal numbers, one for the upper and one for the lower
nibble of
a byte. Frankly I have never really used octal notation for anything
serious. There may well be other uses.
----- Original Message -----
From: <yarringt@xxxxxxxxxxxxx>
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Wednesday, February 20, 2008 1:37 PM
Subject: Re: what is Hex?
> I'm confused. I get using a hex number to represent the upper and
lower
> nibble of a byte, but how could you
> use an octal number to represent the upper and lower nibble, or a
4-bit
> register value? -Debbie
>
> Dale Leavens wrote:
>> Close,
>>
>> Hex (hexadecimal) is base 16 and it is used because of the
architecture
>> of computers where a byte is made up of 8 bits. Rather than represent
the
>> position of 1s and 0s as an 8 bit binary number you can represent the
>> contents of the byte with a Hexadecimal number. Octal (base 8) was
and is
>> sometimes also used to represent the upper or lower nibble of a byte
or
>> the value of a 4 bit register.
>>
>> Hope this informs.
>> .
>
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