Re: [Amforth-devel] Video quod vadis

[Christian B. <cas...@ca...>]

Am Samstag 24 Mai 2008 21:50:35 schrieb Matthias Trute:
> Christian Berger wrote:

> It would be nice if the keyboard words would work with EKEY from
> the forth200x words. That would make code page changes very easy too.

I should look into that. As I mentioned before, I'm not really that fluently 
with Forth.

> > Hmm, maybe we could have block read and write commands. But for that we'd
> > need memory allocation words.
>
> ALLOT exists ;=)

I also need to look into that. It would be great if one had something simmilar 
to the memory handling C does, only working.

> 800 bytes is less than a single ANS block, and power is not essential as
> long as a tv device is concerned ;=)

Well if you have 2048 bytes of RAM on your device total, it is a problem. 
Besides for the ethernet interface you'd still need the SPI, which is already 
used by the video. And Ethernet is _really_ expensive. It costs more than the 
rest of the system, including an additional large screen television set for 
output to larger crowds.
And a normal large TV-set only takes about 10 watts peak, probably a lot less 
with white text on black background. Small non-direct view screens even take 
less power.

> btw: On tuxgraphics there is an atmega88 with an ethernet interface and
> a webserver running on it.

Of course, there have been many projects involving ethernet and TCP/IP. So far 
most only support IPv4.

Well I'll need to look into it. Maybe there's a way to implement Ethernet with 
very little external hardware. Yes, I know there are single chip Ethernet 
interfaces around.

> > My idea would be to have a
> > tiny stripped down networking protocoll which can work with tiny buffers.
>
> Sound like you are looking for CAN.

CAN is so bloated and expensive. I2C on the contrary is widely availiable in 
microcontrollers and easy to implement in software.
Well OK, I admit it, I don't really like CAN. :)

> Bye
> Matthias

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