6502.org Forum  Projects  Code  Documents  Tools  Forum
It is currently Sat Nov 23, 2024 9:46 pm

All times are UTC




Post new topic Reply to topic  [ 30 posts ]  Go to page Previous  1, 2
Author Message
PostPosted: Thu Apr 26, 2012 2:23 am 
Offline
User avatar

Joined: Mon Aug 08, 2011 2:48 pm
Posts: 808
Location: Croatia
Quote:
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?


Top
 Profile  
Reply with quote  
PostPosted: Thu Apr 26, 2012 5:05 am 
Offline
User avatar

Joined: Thu Dec 11, 2008 1:28 pm
Posts: 10986
Location: England
If you need a no, then it would be a no from me - sorry. Too many projects already.


Top
 Profile  
Reply with quote  
PostPosted: Thu Apr 26, 2012 2:39 pm 
Offline
User avatar

Joined: Mon Aug 08, 2011 2:48 pm
Posts: 808
Location: Croatia
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...


Top
 Profile  
Reply with quote  
PostPosted: Sun Jun 24, 2012 12:50 am 
Offline
User avatar

Joined: Mon Aug 08, 2011 2:48 pm
Posts: 808
Location: Croatia
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...


Top
 Profile  
Reply with quote  
PostPosted: Sun Jun 24, 2012 3:06 am 
Offline
User avatar

Joined: Fri Aug 30, 2002 9:02 pm
Posts: 1748
Location: Sacramento, CA
try this link:

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

Daryl


Top
 Profile  
Reply with quote  
PostPosted: Sun Jun 24, 2012 7:04 pm 
Offline
User avatar

Joined: Mon Aug 08, 2011 2:48 pm
Posts: 808
Location: Croatia
I was looking for that. Thanks.


Top
 Profile  
Reply with quote  
PostPosted: Mon Jun 25, 2012 4:23 pm 
Offline
User avatar

Joined: Mon Aug 08, 2011 2:48 pm
Posts: 808
Location: Croatia
The only thing now missing is the 14.31MHz oscillator, which is kinda hard to find on ebay. And a usable jtag...


Top
 Profile  
Reply with quote  
PostPosted: Tue Jun 26, 2012 12:38 am 
Offline
User avatar

Joined: Mon Aug 08, 2011 2:48 pm
Posts: 808
Location: Croatia
Is the 14.31MHz oscillator in fact a 14.318MHz oscillator?


Top
 Profile  
Reply with quote  
PostPosted: Tue Jun 26, 2012 4:35 am 
Offline
User avatar

Joined: Tue Nov 16, 2010 8:00 am
Posts: 2353
Location: Gouda, The Netherlands
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.


Top
 Profile  
Reply with quote  
PostPosted: Tue Jun 26, 2012 5:06 am 
Offline
User avatar

Joined: Mon Aug 08, 2011 2:48 pm
Posts: 808
Location: Croatia
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...


Top
 Profile  
Reply with quote  
PostPosted: Sat Jul 21, 2012 6:21 pm 
Offline
User avatar

Joined: Mon Aug 08, 2011 2:48 pm
Posts: 808
Location: Croatia
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?


Top
 Profile  
Reply with quote  
PostPosted: Wed Aug 08, 2012 2:40 am 
Offline
User avatar

Joined: Mon Aug 08, 2011 2:48 pm
Posts: 808
Location: Croatia
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?


Top
 Profile  
Reply with quote  
PostPosted: Wed Nov 07, 2012 10:34 pm 
Offline
User avatar

Joined: Mon Aug 08, 2011 2:48 pm
Posts: 808
Location: Croatia
From the other topic:
Quote:
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.


Top
 Profile  
Reply with quote  
PostPosted: Thu Nov 08, 2012 2:05 am 
Offline
User avatar

Joined: Fri Aug 30, 2002 9:02 pm
Posts: 1748
Location: Sacramento, CA
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

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


Top
 Profile  
Reply with quote  
PostPosted: Thu Nov 08, 2012 3:55 am 
Offline
User avatar

Joined: Mon Aug 08, 2011 2:48 pm
Posts: 808
Location: Croatia
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?


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 30 posts ]  Go to page Previous  1, 2

All times are UTC


Who is online

Users browsing this forum: No registered users and 57 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to: