It is currently Sat Dec 16, 2017 9:30 pm

All times are UTC - 7 hours



Forum rules


1. NO BLATANT PIRACY. This includes reproducing homebrew less than 10 years old, with the exception of free software.
2. No advertising your reproductions, with the exception of free software.
3. Be nice. See RFC 1855 if you aren't sure what this means.



Post new topic Reply to topic  [ 230 posts ]  Go to page Previous  1 ... 9, 10, 11, 12, 13, 14, 15, 16  Next
Author Message
PostPosted: Tue Jan 29, 2013 12:49 pm 
Offline
User avatar

Joined: Sat Dec 01, 2012 4:10 am
Posts: 65
recently i got my 27c322 chip and wanted to start to build my own cart, but then i noticed that my latch and switch are 74ls4053 and 74ls174. i did some research if the fact that both chips are from the ls family would work out with the project. i read that the reaction time of ls chips are lower than the one of hc chips. is this in any way bad if the chips are working at lower speed?
i ask because before i start soldering everything together i would like to know if everything is also working without any issues.
thanks in advance:)


Top
 Profile  
 
PostPosted: Tue Jan 29, 2013 1:01 pm 
Offline
User avatar

Joined: Wed Dec 06, 2006 8:18 pm
Posts: 2806
There are other NES carts that use the LS series. It should be ok.


Top
 Profile  
 
PostPosted: Tue Jan 29, 2013 1:16 pm 
Offline
User avatar

Joined: Sat Dec 01, 2012 4:10 am
Posts: 65
thanks MottZilla:)
i will try it


Top
 Profile  
 
PostPosted: Wed Jan 30, 2013 12:52 am 
Offline
User avatar

Joined: Wed Apr 07, 2010 1:14 am
Posts: 484
Location: Iran
@ elseyf

Use breadboard or at least use IC socket, don't solder the chips directly to the PCB.
Also be careful with 27C322.
What programmer do you use for programming 27C322?
You must program it in 27C080 (8bit) mode two times :
First Half : A20 --> GND
Second Half : A20 --> +5v
The best way is to program it on a breadboard and wire Zif socket to breadboard manually.
Also ignore D8~D15 (Q8~Q15) completely as if they don't exist!


Top
 Profile  
 
PostPosted: Wed Jan 30, 2013 6:35 am 
Offline
User avatar

Joined: Sat Dec 01, 2012 4:10 am
Posts: 65
@FARID:
thanks for the tip.
I use willem pcb3.5, i will try it out.


Top
 Profile  
 
PostPosted: Tue Mar 19, 2013 1:49 pm 
Offline
User avatar

Joined: Sat Dec 01, 2012 4:10 am
Posts: 65
After i got the time to work on this i am facing a problem:
When i programmed the 27C322 in 8bit mode with 27C080 settings, all i get is scrambled data from the eprom when i verify the content of it. I tripple checked all my connections of the adapter i built myself and they actually match the pinout of a 27C080 and there are no shorts. I can not figure it out what the problem is.
everything works fine when i program my flash chips, eproms and eeproms (i used all kinds upto 4mbits) in 8bit mode.
May there be an issue with voltage? I am using 5V fron USB as i do not know which adapter is used by willem pcb3 board to get myself one.


Top
 Profile  
 
PostPosted: Mon Apr 01, 2013 10:19 am 
Offline
User avatar

Joined: Mon Mar 30, 2009 4:40 pm
Posts: 306
any news on a PCB for this badboy yet? My wallet is waiting to pay :)


Top
 Profile  
 
PostPosted: Mon Jul 08, 2013 12:58 pm 
Offline

Joined: Tue Jan 11, 2011 4:41 am
Posts: 41
Hi
Can i use 74HCT174E and 74HC4053B1?


Top
 Profile  
 
PostPosted: Tue Jul 09, 2013 5:31 am 
Offline
User avatar

Joined: Wed Apr 07, 2010 1:14 am
Posts: 484
Location: Iran
gorgyrip wrote:
Hi
Can i use 74HCT174E and 74HC4053B1?


Yes, they are good enough, you can use them.


Top
 Profile  
 
PostPosted: Tue Jul 09, 2013 11:29 pm 
Offline

Joined: Tue Jan 11, 2011 4:41 am
Posts: 41
FARID wrote:
gorgyrip wrote:
Hi
Can i use 74HCT174E and 74HC4053B1?


Yes, they are good enough, you can use them.


Thank you. Everything it's connected. 4053 will arrive in about a week and i still need to find a 1nf cap.


Top
 Profile  
 
PostPosted: Wed Jul 10, 2013 12:29 am 
Offline
User avatar

Joined: Wed Apr 07, 2010 1:14 am
Posts: 484
Location: Iran
gorgyrip wrote:
FARID wrote:
gorgyrip wrote:
Hi
Can i use 74HCT174E and 74HC4053B1?


Yes, they are good enough, you can use them.


Thank you. Everything it's connected. 4053 will arrive in about a week and i still need to find a 1nf cap.


1nF(102) ceramic capacitor is really easy to find everywhere :

Image


Top
 Profile  
 
PostPosted: Wed Jul 10, 2013 3:20 am 
Offline

Joined: Tue Jan 11, 2011 4:41 am
Posts: 41
FARID wrote:

1nF(102) ceramic capacitor is really easy to find everywhere :

Image


I know the code, but i can't seem to find it at my local store.


Top
 Profile  
 
PostPosted: Mon Jul 15, 2013 8:52 am 
Offline

Joined: Tue Jan 11, 2011 4:41 am
Posts: 41
Today i received the 4053 and i also found a 1nf cap (in a jamma bootleg board).
I used megaman USA roms. For megaman 1 and 2 i used this patches to convert them to mmc3:
http://acmlm.kafuka.org/board/thread.php?id=7357

megaman 3 chr it's only 128k
megaman 1 prg it's only 128k
I dubbled both.

Megaman 4,5,6 works fine, but megaman 1 and 2 have huge glitches.
If i start megaman 3, press reset and select megaman1, the game has less glitches.
If i start megaman 4,5 or 6, press reset and select megaman1, the game works.

How can i fix this?
And pins 14 and 15 of 74174 and pin 7 of 4053 should i leave unconnected?


Top
 Profile  
 
PostPosted: Mon Jul 15, 2013 9:46 am 
Offline
User avatar

Joined: Wed Apr 07, 2010 1:14 am
Posts: 484
Location: Iran
Pins 14 and 15 of 74174 --> Leave them floating
pin 7 of 4053 --> Tie it to GND


Top
 Profile  
 
PostPosted: Mon Jul 15, 2013 10:06 am 
Offline

Joined: Tue Jan 11, 2011 4:41 am
Posts: 41
Pin 7 connected to GND, nothing changed.

I know this is the first thing i should have done, but... Anyway, I tested the patched megaman 1 and 2 roms on a tgrom board and i get the same glitches.
But why do they work on a multicart if i first start megaman 4?
Can you please look at the patches?


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 230 posts ]  Go to page Previous  1 ... 9, 10, 11, 12, 13, 14, 15, 16  Next

All times are UTC - 7 hours


Who is online

Users browsing this forum: No registered users and 2 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:  
Powered by phpBB® Forum Software © phpBB Group