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Date: Mon, 15 Oct 2012 00:40:58 +0100
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Subject: Re: Feedback on my python framework I'm building.
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On 2012-10-14 23:38, Dave Angel wrote:
> On 10/14/2012 08:48 AM, Roy Smith wrote:
>> In article <507a3365$0$6574$c3e8da3$5496439d@news.astraweb.com>,
>>  Steven D'Aprano <steve+comp.lang.python@pearwood.info> wrote:
>>
>>> Remember using PEEK and POKE commands with BASIC back in
>>> 1978? Pretty much impossible in Python.
>> But, trivial to implement as an extension :-)
> PEEK and POKE were intended to be used with memory mapped devices.
> Simplest example is the 6502 chip, which had no I/O bus -- it was all
> memory mapped.  Want to change baud rate?  poke a byte somewhere.
>
> These days, the only device I can think of that's usually memory mapped
> is the video.  And few programs talk to it that way.
>
> Now, INP and OUT (or various similar names) were for doing port I/o.
> But I suspect that modern systems aren't going to let you do much of
> that either.
>
It depends on the CPU. Some have specialised instructions for I/O,
others don't.