Groups > comp.sys.apple2.programmer > #781

Re: Dual 65C816/65C02 programs

From	Egan Ford <datajerk@gmail.com>
Newsgroups	comp.sys.apple2.programmer
Subject	Re: Dual 65C816/65C02 programs
Date	2013-07-27 15:04 -0600
Organization	XMission http://xmission.com/
Message-ID	<kt1ckm$vge$1@news.xmission.com> (permalink)
References	(4 earlier) <df594e1e-9fff-4500-a727-bb19c4d89758@googlegroups.com> <ksbr2i$82p$1@news.xmission.com> <205ff4d1-03fa-462b-8b43-4345473ff2c8@googlegroups.com> <kseioh$cs2$1@news.xmission.com> <98019f17-3110-4775-acef-17d7e36710d9@googlegroups.com>

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On 7/25/13 9:25 AM, gids.rs@sasktel.net wrote:

> Due to 16-bit registers used in 16 mode, detection and redirection would also not work, since there pretty much will never be any common code, unless you are using emulation mode from 16-bit mode.  But the IIGS is about speed, and you will want to use 16-bits to benefit from that speed.

Yes that is very true, however there are a few exceptions, e.g. JMPs and 
tests on flags.  E.g LDA addr, you do not care what the value is, but 
you can test for zero flag.  But then there is a challenge of what bank 
if on a 16-bit system....

> You are way better off to have two separate programs so that both 8-bit code and 16-bit code are not in memory at the same time.
>
> Step 1: Identify computer
> Step 2: run 16-bit program if IIGS found
>        : run 8-bit program if IIGS not found
>
> RAM memory is way more precious than disk space.

Completely agree.  That was my first post in this thread, "I can think 
of one reason why you wouldn't want to do that--code size. The code 
segment would most likely take 2x RAM.".

This thread has turned in to a "could I", vs. a "should I".

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Thread

Dual 65C816/65C02 programs D Finnigan <dog_cow@macgui.com> - 2013-07-14 02:35 +0000
  Re: Dual 65C816/65C02 programs Egan Ford <datajerk@gmail.com> - 2013-07-14 21:35 -0500
    Re: Dual 65C816/65C02 programs D Finnigan <dog_cow@macgui.com> - 2013-07-15 21:34 +0000
      Re: Dual 65C816/65C02 programs Charlie <charlieDOTd@verEYEzon.net> - 2013-07-15 20:47 -0400
      Re: Dual 65C816/65C02 programs gbody4@bigpond.com - 2013-07-15 18:52 -0700
        Re: Dual 65C816/65C02 programs Dagen Brock <DagenBrock@gmail.com> - 2013-07-19 07:49 -0700
          Re: Dual 65C816/65C02 programs Egan Ford <datajerk@gmail.com> - 2013-07-19 10:55 -0600
            Re: Dual 65C816/65C02 programs Dagen Brock <DagenBrock@gmail.com> - 2013-07-19 13:21 -0700
              Re: Dual 65C816/65C02 programs Egan Ford <datajerk@gmail.com> - 2013-07-20 11:52 -0600
                Re: Dual 65C816/65C02 programs D Finnigan <dog_cow@macgui.com> - 2013-07-20 22:47 +0000
                Re: Dual 65C816/65C02 programs Egan Ford <datajerk@gmail.com> - 2013-07-21 11:19 -0600
                Re: Dual 65C816/65C02 programs D Finnigan <dog_cow@macgui.com> - 2013-07-21 17:35 +0000
                Re: Dual 65C816/65C02 programs gids.rs@sasktel.net - 2013-07-25 08:25 -0700
                Re: Dual 65C816/65C02 programs Egan Ford <datajerk@gmail.com> - 2013-07-27 15:04 -0600

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