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Re: Programming the Uthernet in 6502 assembly language

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Dagen Brock wrote:
> This is great.  I'll take a more in depth look tomorrow.  Sorry, I could
> only glance for now as I'm preparing for the work week.  
> 
> This seems timely with the talk of the Uthernet II.  Can you comment on
> how
> different or similar that programming model might be?

The thing is, the Uthernet II is going to be using the W5100 which has a
TCP/IP stack built-in. So in theory, you could do a lot more with less code
(a 6502 IP stack, that is).

Now both the CS8900A in the original Uthernet, and the W5100 in the Uthernet
II communicate through a few $C0 page I/O locations in the Apple. The
CS8900A has a 16-bit data bus, so on the Apple side, you need to load $ADDR
and $ADDR+1 with the low and high bytes. The W5100 in the Uthernet II is
8-bit, so there is only one address to use.

Both chips have several kilobytes of memory that are not part of the Apple's
address space. You have to load a 16-bit pointer to address the Ethernet
chip's memory, then you access the I/O location(s) that I mentioned in the
previous paragraph.

So in summary, the programming model for both is fairly similar.

-- 
]DF$
Apple II Book: http://macgui.com/newa2guide/
Usenet: http://macgui.com/usenet/  <-- get posts by email!
Apple II Web & Blog hosting: http://a2hq.com/

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Thread

Programming the Uthernet in 6502 assembly language D Finnigan <dog_cow@macgui.com> - 2014-01-31 21:12 +0000
  Re: Programming the Uthernet in 6502 assembly language Egan Ford <datajerk@gmail.com> - 2014-02-01 09:29 -0700
  Re: Programming the Uthernet in 6502 assembly language Dagen Brock <DagenBrock@gmail.com> - 2014-02-02 21:42 -0800
    Re: Programming the Uthernet in 6502 assembly language D Finnigan <dog_cow@macgui.com> - 2014-02-03 21:31 +0000
      Re: Programming the Uthernet in 6502 assembly language Dagen Brock <DagenBrock@gmail.com> - 2014-02-04 06:56 -0800
        Re: Programming the Uthernet in 6502 assembly language D Finnigan <dog_cow@macgui.com> - 2014-02-04 19:00 +0000
          Re: Programming the Uthernet in 6502 assembly language Dagen Brock <DagenBrock@gmail.com> - 2014-02-05 12:58 -0800

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