[ColorForth] 25x graphics

[John Drake <jmdrake_98@xxxxxxxxx>]

I assume that one of the processors on a 25x could
be programmed to work in a similair way to the
video co-processor on the F21.  Of course, like you,
I would rather see 18 bit video as opposed to 4 bit
video.  Or perhaps one could use 3 processors to
create 3, 4bit "video planes".

The other interesting posibility is 3D video.  
Some people dismiss MISC chips for 3D video because
of the lack of a floating point co-processor or
even a divide instruction.  But after getting more
information from Jeff's site about the 
implementation of CORDIC functions on the F21
I believe that quality realtime 3D graphics is
possible on the 25x.  I also read that someone
was working on a 3D graphic wordlist for the F21.
Did anything ever come of that?

--- Mark Slicker <maslicke@xxxxxxxxxxx> wrote:
> I was thinking a bit about how one might implement
> video using the
> 25x. The 25x apears powerful enough to eliminate the
> need for a
> frame buffer. Some quick calulations will show that
> a core at 2400 MIPS is
> capable of updating a screen of 1024x768 pixels at
> 60 Hz. 18 bits are
> capable of a respectable number of colors. The
> parallel architechture
> should allow for many interesting stratagies for
> drawing. 
> 
> Perhaps someone could tell me this, I don't know
> much of electronics yet,
> how would the electrical interface for the video
> work? I've implemented a
> VGA video controller once on an FPGA, it was very
> simple. The vertical and
> horizontal syncs were generated by counters and
> additional logic. The
> colors (RGB) were either on or off for an 8 color
> display. Every thing 
> was calculated based off a fixed clock. With this
> interface, I'd assume
> you'd need some digital to analog converters, and
> perhaps something to
> syncronize everything to get the timing right. Let
> me know what you know
> about this, or perhaps point me in the right
> direction (books, links, 
> ect).
> 
> Mark
> 
> 
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