A85: Re: Most unused opcode

To: <assembly-85@lists.ticalc.org>
Subject: A85: Re: Most unused opcode
From: "Dines Justesen" <dines@resnet.gatech.edu>
Date: Thu, 12 Nov 1998 14:17:15 -0500
Delivered-To: assembly-85-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-85@lists.ticalc.org


The following instructructions is not seem in asm programs very often :

ADD A(IX+d)  *8EDD)
CPD (A9ED)
CPI (A1ED)
DEC IX/IY (2BDD/FD)
IND(R) (AAED/BAED)
INI(R) (A2ED/B2ED)
JP(IX) (E9DD)
JP(IY) (E9FD)
OTDR (BBED)
OTIR (B3ED)
OUTD (ABED)
OUTI(A3ED)

However, parts of these instructions (like 2B) corresponds too often used
instructions. You would also have to make sure that no data included this
pattern.

Dines

----- Original Message -----
From: Richard Owen Lewis <richardlewis@cedarcity.net>
To: <assembly-85@lists.ticalc.org>
Sent: Thursday, November 12, 1998 1:06 PM
Subject: A85: Most unused opcode


>
>This is a survey kind of thing.  I need to know what you guys think the
>most unused Z80 opcode is on the 85.
>
>Yes, there is a purpose to this.  I need to have some kind of marker byte,
>inside my code, so at runtime, I can have a program search through the
>code,  pick out my marker, patch in some code that needs to be there, and
>then when its done, put it back the way it was.
>
>If this proves to be completely unfeasable, I'll just have to work on a new
>relocation routine (my old one is buggy, and I don't remember how it works
>anyway =)
>
>Yes, this is for Summit, in case somebody is wondering.
>
>

Follow-Ups:

Re: A85: Re: Most unused opcode

From: kaus <kaus@cybrzn.com>