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Groups > comp.lang.forth > #57150
| From | anton@mips.complang.tuwien.ac.at (Anton Ertl) |
|---|---|
| Newsgroups | comp.lang.forth |
| Subject | Re: 6502 anyone ? |
| Date | 2017-04-12 12:55 +0000 |
| Organization | Institut fuer Computersprachen, Technische Universitaet Wien |
| Message-ID | <2017Apr12.145508@mips.complang.tuwien.ac.at> (permalink) |
| References | (1 earlier) <ock6so$33k$3@dont-email.me> <a1198ea9-473f-477c-b88b-4f95c5f53008@googlegroups.com> <86h91uui7d.fsf@molnjunk.nocrew.org> <ockvej$6ut$1@cherry.spenarnc.xs4all.nl> <868tn5vqv8.fsf@molnjunk.nocrew.org> |
Lars Brinkhoff <lars.spam@nocrew.org> writes:
>Albert van der Horst wrote:
>> If you know the chip you realize that it has 128 16 bit registers on
>> the zero page.
>
>Of course proper use of the zero page is important in 6502 programming.
>But can you honestly call them registers? They reside in external RAM,
>so that's goes against the regular meaning of registers. If you ignore
>that implementation detail, the programming model still don't expose
>them as 16-bit register-like entities. You can only deal with chunks of
>8 bits at a time.
Right. And you have to always go through one of the real registers to
get something there or out of there. The only register-like quality
the zero page had was that you could use two-byte units for
addressing, similar to index or address registers in other CPUs.
- anton
--
M. Anton Ertl http://www.complang.tuwien.ac.at/anton/home.html
comp.lang.forth FAQs: http://www.complang.tuwien.ac.at/forth/faq/toc.html
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6502 anyone ? john <anon@example.com> - 2017-04-11 13:07 +0100
Re: 6502 anyone ? rickman <gnuarm@gmail.com> - 2017-04-11 23:31 -0400
Re: 6502 anyone ? Mark Wills <markwills1970@gmail.com> - 2017-04-12 01:27 -0700
Re: 6502 anyone ? Lars Brinkhoff <lars.spam@nocrew.org> - 2017-04-12 10:46 +0200
Re: 6502 anyone ? Mark Wills <markwills1970@gmail.com> - 2017-04-12 01:57 -0700
Re: 6502 anyone ? Lars Brinkhoff <lars.spam@nocrew.org> - 2017-04-12 12:24 +0200
Re: 6502 anyone ? hughaguilar96@gmail.com - 2017-04-12 14:37 -0700
Re: 6502 anyone ? lehs <skydda.barnen@gmail.com> - 2017-04-12 17:16 -0700
Re: 6502 anyone ? hughaguilar96@gmail.com - 2017-04-12 18:10 -0700
Re: 6502 anyone ? lehs <skydda.barnen@gmail.com> - 2017-04-12 23:46 -0700
Re: 6502 anyone ? rickman <gnuarm@gmail.com> - 2017-04-13 03:00 -0400
Re: 6502 anyone ? lehs <skydda.barnen@gmail.com> - 2017-04-13 00:37 -0700
Re: 6502 anyone ? lehs <skydda.barnen@gmail.com> - 2017-04-13 00:42 -0700
Re: 6502 anyone ? rickman <gnuarm@gmail.com> - 2017-04-13 12:57 -0400
Re: 6502 anyone ? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-04-13 12:01 -0500
Re: 6502 anyone ? lehs <skydda.barnen@gmail.com> - 2017-04-13 10:42 -0700
Re: 6502 anyone ? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-04-13 12:55 -0500
Re: 6502 anyone ? lehs <skydda.barnen@gmail.com> - 2017-04-13 11:13 -0700
Re: 6502 anyone ? rickman <gnuarm@gmail.com> - 2017-04-13 14:24 -0400
Re: 6502 anyone ? lehs <skydda.barnen@gmail.com> - 2017-04-13 11:57 -0700
Re: 6502 anyone ? rickman <gnuarm@gmail.com> - 2017-04-13 15:15 -0400
Re: 6502 anyone ? rickman <gnuarm@gmail.com> - 2017-04-13 14:23 -0400
Re: 6502 anyone ? john <anon@example.com> - 2017-04-12 10:25 +0100
Re: 6502 anyone ? albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-04-12 12:27 +0200
Re: 6502 anyone ? Lars Brinkhoff <lars.spam@nocrew.org> - 2017-04-12 12:53 +0200
Re: 6502 anyone ? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-04-12 12:55 +0000
Re: 6502 anyone ? rickman <gnuarm@gmail.com> - 2017-04-12 12:20 -0400
Re: 6502 anyone ? Mark Wills <markwills1970@gmail.com> - 2017-04-12 05:10 -0700
Re: 6502 anyone ? Michael Barry <barrym95838@yahoo.com> - 2017-04-12 22:41 -0700
Re: 6502 anyone ? Joel Rees <joel.rees@gmail.com> - 2017-04-13 02:14 -0700
Re: 6502 anyone ? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-04-13 11:01 +0000
Re: 6502 anyone ? jim.brakefield@ieee.org - 2017-04-13 06:33 -0700
Re: 6502 anyone ? Mark Wills <markwills1970@gmail.com> - 2017-04-13 07:24 -0700
Re: 6502 anyone ? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-04-13 09:51 -0500
Re: 6502 anyone ? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-04-13 17:16 +0000
Re: 6502 anyone ? hughaguilar96@gmail.com - 2017-04-13 13:08 -0700
Re: 6502 anyone ? Joel Rees <joel.rees@gmail.com> - 2017-04-14 08:06 -0700
Re: 6502 anyone ? rickman <gnuarm@gmail.com> - 2017-04-13 13:00 -0400
Re: 6502 anyone ? "HAA" <someone@microsoft.com> - 2017-04-13 10:42 +1000
Re: 6502 anyone ? hughaguilar96@gmail.com - 2017-04-12 18:45 -0700
Re: 6502 anyone ? "HAA" <someone@microsoft.com> - 2017-04-14 13:01 +1000
Re: 6502 anyone ? rickman <gnuarm@gmail.com> - 2017-04-14 01:21 -0400
Re: 6502 anyone ? hughaguilar96@gmail.com - 2017-04-13 23:23 -0700
Re: 6502 anyone ? john <anon@example.com> - 2017-04-12 10:08 +0100
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