[A83] Re: hex <-> bin <-> dec techniques

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: hex <-> bin <-> dec techniques
From: Patai Gergely <patai.ti@freemail.hu>
Date: Mon, 21 Jan 2002 18:41:25 +0100 (CET)
In-Reply-To: <F125DO7STjkIYA5kcDj00001bdd@hotmail.com>
Reply-To: assembly-83@lists.ticalc.org


> Can somebody give me the techniques to change numbers
> between hex, bin and dec. Maybe also a method to show
> that hex, bin or dec...

What do you mean? I suppose you have the numbers as ASCII 
strings. When converting from/to decimal, you have to first 
get the numbers in binary form, sinc you need to do many 
calculations on them: divisions by 10 in series, and taking 
the remainders for each digit.

Hex<->Bin is quite trivial, as four binary digits are 
equivalent to one hexadecimal digit. You need to do no more 
than associating the 16 combinations with each other.

BTW here's a little trick to convert a 4-bit number in A 
into an ASCII character (it won't work with A values 
greater than 15, of course):

add a,$90
daa
adc a,$40
daa

[numbers greater than 9 will be capital letters]

PG

References:

[A83] hex <-> bin <-> dec techniques

From: "SUCKER from the old days" <sucker_pvn@hotmail.com>