Re: Hex to ascii


----- Original Message -----
From: "Robert Redelmeier" <redelm@xxxxxxxxxxxxxxx>
Newsgroups: comp.lang.asm.x86
Sent: Wednesday, September 13, 2006 1:46 PM
Subject: Re: Hex to ascii



"Robert Redelmeier" <redelm@xxxxxxxxxxxxxxx> wrote in message
news:KtXNg.715$vJ2.191@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Displacer <spamtrap@xxxxxxxxxx> wrote in part:
Hi, I need to convert a hex byte into its 2 byte ascii
number. What I'm doing is building a file name based on a
single byte. The file name is mapxx where xx is a 2 digit
ascii number, such as map12. Anyway my question is if my
routine is called with a value of 0Ch, how do I convert
that into the needed 31h 32h, which is plugged into the
file name to make map12?

Very common question. Assuming hex < 99 in AL:

AAM
AAM ax, 3030h

two ASCII digits are in AX. The AAM instruction
(ASCII Adjust after Multiply) does the work for you.


Nice! I'm thinking that would produce a nice nybble split for byte hex
routines if you use 'AAM imm8' with 10H for imm8... correct?
http://www.x86.org/secrets/opcodes/aam.htm

You must've missed Randall Hyde's 8/31 post "Faster HexToBuffer Routines"
since you didn't suggest using 'AAM imm8' in my or Chuck's brute force hex
routines.


Rod Pemberton

.

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