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PostPosted: Wed Jul 16, 2014 10:43 pm 
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Joined: Mon Oct 21, 2013 11:32 pm
Posts: 18
Trying to do uxrom 512 with 161 and 32 chips. But still - gray screen.
Is where error with schematic?

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Last edited by mr-volk on Sat Aug 09, 2014 12:12 pm, edited 1 time in total.

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PostPosted: Thu Jul 17, 2014 12:32 am 
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Joined: Mon Oct 21, 2013 11:32 pm
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Seems solution
ground 7 and 10 pins. Thx for nikita600.
Try later.


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PostPosted: Thu Jul 24, 2014 2:44 am 
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Joined: Fri Jul 04, 2014 2:34 pm
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Location: Germany
Hi, you found a solution now? I tried the same with ground pin 7 and 10, still grey screen.
Hope we find a fix soon!


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PostPosted: Sat Jul 26, 2014 7:36 am 
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Joined: Fri Jul 04, 2014 2:34 pm
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Location: Germany
Sorry for the double post but I read that using a 74HC377 and 2x74HC32 works as well? Is this true? Can anyone confirm that it is working and if yes, how is it wired? I'd love help for this project.


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PostPosted: Sat Jul 26, 2014 11:13 am 
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Joined: Sun Sep 19, 2004 11:12 pm
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Location: NE Indiana, USA (NTSC)
The inputs of the 74HC377 would be wired the same way they are on the Color Dreams board. Each output would be wired to one input of each of the 74HC32's OR gates, with CPU A14 to the other input.


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PostPosted: Tue Jul 29, 2014 2:49 am 
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Joined: Fri Jul 04, 2014 2:34 pm
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Location: Germany
Would you mind creating a diagram for that?
Does A14 go into the 1st pin of the 74377?
Help appreciated, since I'm pretty new to those custom mappers.


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PostPosted: Sat Aug 02, 2014 6:29 am 
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Location: Germany
EDIT: I converted the game to MMC3. All works now.


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PostPosted: Sat Aug 09, 2014 12:09 pm 
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Joined: Mon Oct 21, 2013 11:32 pm
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ground 7 and 10 pins
all other is right


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PostPosted: Sat Aug 09, 2014 12:31 pm 
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Joined: Fri Jul 04, 2014 2:34 pm
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Location: Germany
I tried that. Only grey screen. Maybe I soldered something wrong.
Either way, I made TNROM board with SMB2 and it works now.
Thank you.


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PostPosted: Wed Dec 27, 2017 9:39 am 
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Joined: Tue Apr 11, 2006 4:08 am
Posts: 274
Location: Poland
Is this scheme correct? Because it is not clear whether the problem was finally solved.
I need to do UxROM 512KB, unfortunately I do not have 74xx377 but I have a lot of 74xx161 and xx32.


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PostPosted: Wed Dec 27, 2017 10:56 am 
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Joined: Sun Sep 19, 2004 11:12 pm
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Location: NE Indiana, USA (NTSC)
Two 74161 and two 7432 make one oversize UxROM. You need to route D3 through one '161 and '32 to PRG ROM A17, as for the UNROM to UOROM mod, and do similarly with D4 to PRG ROM A18 through the other 161/32 pair.


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