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PostPosted: Thu Apr 26, 2012 2:23 am 
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is there anyone who would volunteer to take over this project, if i should get too busy with other things(faculty), of course i would ship you the components and hardware?


Yes, no, maybe?


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PostPosted: Thu Apr 26, 2012 5:05 am 
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If you need a no, then it would be a no from me - sorry. Too many projects already.


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PostPosted: Thu Apr 26, 2012 2:39 pm 
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Thanks for replying.
I didn't plan to buy the components yet, and if(when) i do, i will work on it for a while, i guess, and if i get stuck with it, it would probably be in a phase where the hardware is completed...


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PostPosted: Sun Jun 24, 2012 12:50 am 
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There was a link about a video generator that used the xc95108 cpld and another Sony chip. Now i got them both, but i can't find that link anymore...


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PostPosted: Sun Jun 24, 2012 3:06 am 
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try this link:

http://elm-chan.org/works/crtc/report.html

Daryl


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PostPosted: Sun Jun 24, 2012 7:04 pm 
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I was looking for that. Thanks.


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PostPosted: Mon Jun 25, 2012 4:23 pm 
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The only thing now missing is the 14.31MHz oscillator, which is kinda hard to find on ebay. And a usable jtag...


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PostPosted: Tue Jun 26, 2012 12:38 am 
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Is the 14.31MHz oscillator in fact a 14.318MHz oscillator?


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PostPosted: Tue Jun 26, 2012 4:35 am 
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Dajgoro wrote:
Is the 14.31MHz oscillator in fact a 14.318MHz oscillator?

Yes. The frequency is apparently 4 times the NTSC colorburst frequency, which is 3.579545
But doesn't Croatia use PAL ? According to the article:
Quote:
This is changes for PAL configuration. Change R10 to 16k ohms, tie pin# 7 to ground, change color sub-carrier clock to external 4.43MHz, and master clock have to be changed to 13.5MHz.

Which is strange, because 4 * 4.43361875 = 17.734475 MHz, and not 13.5 MHz.


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PostPosted: Tue Jun 26, 2012 5:06 am 
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Arlet wrote:
Dajgoro wrote:
Is the 14.31MHz oscillator in fact a 14.318MHz oscillator?

Yes. The frequency is apparently 4 times the NTSC colorburst frequency, which is 3.579545
But doesn't Croatia use PAL ? According to the article:
Quote:
This is changes for PAL configuration. Change R10 to 16k ohms, tie pin# 7 to ground, change color sub-carrier clock to external 4.43MHz, and master clock have to be changed to 13.5MHz.

Which is strange, because 4 * 4.43361875 = 17.734475 MHz, and not 13.5 MHz.


Yes we use PAL here, but all the tv sets work with both...


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PostPosted: Sat Jul 21, 2012 6:21 pm 
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In the archive file that is downloadable on the website, there are abel files to program the cpld.
How exactly to i program the cpld with them using the Xilinx lpt jtag?


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PostPosted: Wed Aug 08, 2012 2:40 am 
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I think that the Propeller chip is a better solution to this device, since it has a built in video generator for pal/ntsc and vga. And not to mention 8 cores @20mips.
http://en.wikipedia.org/wiki/Parallax_Propeller
Any comments?


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PostPosted: Wed Nov 07, 2012 10:34 pm 
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From the other topic:
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If i use the pic18f4455 and the 8.86MHz crystal as clock and pll i should get 8 mips, same thing with the atmega32, but the atmega doesn't have the parallel slave port, so i can't interface it.
I also should add an external ram to act as a framebuffer. The 16f877 is much simpler, but it is slower as well, and i wonder what would be the max resolution if the mcu has only 2mpis.


Lets put aside the 3d stuff for now.
For start ill just try to get plain text to show up on the screen.


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PostPosted: Thu Nov 08, 2012 2:05 am 
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For plain black & white text, you can use any AVR that has 1k of RAM easily.
I used an ATMega8 with a 16MHz clock and two resistors on my SBC-4 Daughter board. It provides a 40x25 character display. Because of a design imperfection, there is a 1 pixel gap between the charcters that would make horizontal lines (DOS box drawing or the underline) have small gaps. Other than that, it runs very well.

There are a few options for connecting to a host.

See this for more info:
http://sbc.rictor.org/dauterm.html

Daryl

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Please visit my website -> https://sbc.rictor.org/


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PostPosted: Thu Nov 08, 2012 3:55 am 
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The parallel slave port is fancy because the mcu gets an interrupt on read/write, and you can also read data from the mcu.
2 mips is kinda slow, what if i placed an external framebuffer ram, and a 8 bit counter that would iterate through the line and the mcu would only have to care about sync and updating the framebuffer?


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