Re: [colorforth] How to recreate the 31 July color.com

[Jason Kemp <jason.kemp@xxxxxxxxxxxxxxxx>]

Dear Albert & John,

Thank you.  I shall look at these works.  Hmm, I think I ought to look 
at NASM too.

There is just so much to learn.

Jason

Albert van der Horst said the following on 23/02/2008 12:08:
> On Fri, Feb 22, 2008 at 06:11:41PM -0700, John Comeau wrote:
> <SNIP>
>   
> > I ran byte-by-byte and assembler-line-by-assembler-line comparisons
> > until I got everything but the actual numeric opcodes the same; GNU's
> > "as" and MASM just choose different variants.
> >     
>
> I'm very proud that my reverse engineering system doesn't
> have that problem, but of course it is written in Forth.
>
> It distinguishes between
>   MOV, T| BX| R| AX'|
> and
>   MOV, F| AX| R| BX'|
> (move register ax from bx, move register bx to ax)
> which are actually different opcodes in Intel.
>
> I used the same comparison technique as you.
> If you imagine that you have multi megabyte executables, the opcode
> problem could become unbearable.
>
> More on my site below. Choose FTP, then pub then colorforth.
>
> Groetjes Albert
>
> --
> Albert van der Horst, UTRECHT,THE NETHERLANDS
> Economic growth -- like all pyramid schemes -- ultimately falters.
> albert@spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst
>
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