[colorforth] Color Forth for MISC (was:Hello, World! and other simple programs)

[Jecel Assumpcao Jr <jecel@xxxxxxxxxxxxx>]

On Thursday 26 July 2001 14:07, Jeff Fox wrote:
> I haven't been able to get colorforth running on
> a machine yet.  I have thought of implementing
> a version on F21 but would like to get a copy
> running on a PC.

Same here, though on my father's PC I did get to see some colored 
rectangles briefly before it rebooted. It has an ATI card, but it is 
not AGP. Two other machines just showed black screens. How about a 
standard VGA mode version (640x480 @ 16 colors... yuck!)?

Anyway, I never did develop a CF for the Atmel AVR processor because as 
I thought about a way to get around the "no write to program memory" 
problem and decided to look into token threading I found some really 
great tools at http://www.tinyboot.com

Not only did it have a mixed token threading/subroutine threading 
design, it also runs on the AVR, the 8051 and the Motorola DragonBall. 
The AVR version doesn't allow you to define new words interactively, 
however.

But I noticed that the people for whom I am doing this project have 
more ambitious plans for the future, so I suggested that we might do 
better with a MISC in FPGA instead. A 15K gate Spartan 2 costs $7, so 
even with an external Flash memory it is half the price of the 
ATmega103 we now have. A quick test of the free Xilinx tools with Dr. 
Ting's nice P16 VHDL design resulted in a 25K layout running at a 
surprising 50 MHz for the slowest speed grade chip. I am sure that a 
design that used RAM for the stacks instead of individual flip flops 
would be much smaller.

If I go this route, I would have something that would be almost F21 
compatible. So my question is: any suggestions for porting CF to this 
thing?

-- Jecel

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