From: Jim Choate <ravage@ssz.com>
Date: Thu, 9 Oct 1997 20:46:47 +0800
To: cypherpunks@ssz.com (Cypherpunks Distributed Remailer)
Subject: Re: 6502 ML programming (fwd)
Message-ID: <199710091302.IAA17486@einstein.ssz.com>
MIME-Version: 1.0
Content-Type: text



Forwarded message:

> Date: Thu, 9 Oct 1997 02:32:27 -0400
> From: ghio@temp0133.myriad.ml.org (Matthew Ghio)
> Subject: Re: 6502 ML programming

> Jim Choate <ravage@ssz.com> wrote:
> > 
> > There in no 'DATA' construct in 6502 assembly.
> > 
> > This is some sort of macro that either the assembler or programmer
> > defined. All official Rockwell/Commodore [1] 6502 assembly mnemonics are
> > three letter.
> 
> True, but most assemblers would let you insert static data into the object
> file using various pseudo-ops like that.
> 
> 
> > Idealy a jump table was created that had the various target addresses for
> > your routines.
> 
> Oh, those were fun to debug too...
> 
> 
> > The most efficient way to store data in 6502 is to put it in the first 256
> > bytes of ram, then it could be called in no more than 2 clock cycles.
> 
> Actually that took three cycles.  One to fetch the opcode, one to fetch the
> target address, and one to fetch the data byte.  If you wanted to do it in
> two cycles, you had to write the data into the operand of the instruction
> that loaded it (self-modifying code).

Wow, we actualy agree on all points...that has to be a first.


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