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PostPosted: Thu May 19, 2005 4:42 pm 
It works!
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PostPosted: Thu May 19, 2005 8:01 pm 
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Joined: Mon Sep 27, 2004 2:57 pm
Posts: 1249
Congratulations!! :)

I never have the will to do something like that. :(
That's why I quit working on JQ. :P

So you took the top off of the nes instead of cutting holes in everything?
Brilliant! :D I never thought of that!


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PostPosted: Thu May 19, 2005 9:11 pm 
Thanks :)
I still had to cut the cart, but if I leave the top off the NES I can pull the EEPROMs out without having to remove the cart everytime, which is pretty nice.


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PostPosted: Sat May 21, 2005 11:52 am 
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Joined: Sat Oct 02, 2004 12:07 pm
Posts: 163
i see you have it fixed, part of the problem you were having i believe, is due to pin 27 on the CHR rom... the Mask ROM has this set to +5v where the (E)EPROM uses this for an address line. you either have to mirror the CHR multiple times (like you did, i believe) in the (E)EPROM or disconnect pin 27


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PostPosted: Sat May 21, 2005 3:26 pm 
Also, if you EEPROM (or EPROM) is CMOS (it most likely is, too), don't leave any pins floating. Always tie them to +5V or GND through a 10K resistor.

CMOS should never be left floating.


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PostPosted: Sat May 21, 2005 11:34 pm 
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Joined: Mon Sep 27, 2004 2:57 pm
Posts: 1249
The reason CMOS shouldn't have floating pins is because when a pin isn't connected to something, it tends to randomly toggle on or off, because of the electrical fields and other convenient stuff in the air. :)


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