UNROM to UOROM

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proveaux
Posts: 87
Joined: Wed Feb 15, 2012 10:19 pm

UNROM to UOROM

Post by proveaux » Sun Aug 12, 2012 7:47 pm

UNROM to UOROM
Bend up eprom pins 1, 2, 24, 30, 31, and 32.
Bend up MC74HC32 pin 3.Can be left as is.
Solder pin 1 and 24 to hole 14.
Solder pin 2 to hole 22.
Solder pin 30 to MC74HC32 pin 3.
Solder pin 32 to hole 28.

I got this from looking at tokumaru pic of his uorom test cart. Worked for me.

Edit... some games wouldn't work in cart if 24 wasn't grounded.
Last edited by proveaux on Thu Sep 06, 2012 7:45 pm, edited 2 times in total.

SnoopKatt
Posts: 47
Joined: Tue Aug 14, 2012 8:37 pm

Re: UNROM to UOROM

Post by SnoopKatt » Fri Aug 17, 2012 11:09 pm

Thanks! I'll add it to my list of conversions.

FrankWDoom
Posts: 236
Joined: Mon Jan 23, 2012 11:27 pm

Re: UNROM to UOROM

Post by FrankWDoom » Fri Nov 21, 2014 1:18 am

Some additional info, and then questions:

On a NES konami unrom board, the inputs for 7432 pin 3 (1Y) are
74161 Q3 (pin 11)
CPU A14 (cart edge pin 41)

On the TAITO-UNROM board used for Takeshi no Chousenjou, those two signals go to pins 4 and 5, 2A and 2B. So in that case it should be 2Y on pin 6 going to CHR A17.

And so the question: I'm trying to put the translated rom (http://www.romhacking.net/translations/1682/) on the original cart. I expanded and patched and test on a socketd NES cart and everything seemed ok. But I don't get anything after installed the eprom on the original board. Thoughts/ideas? Does this board do something else differently than the NES unrom board?
I'm assuming the prg layout is regular nintendo 128K prg, since it was a 28 pin mask rom.

wiring
pin 1 up
pin 2 -> hole 22 chr a16
pin 24 -> pin 16 gnd
pin 30 -> 7432 pin 6
pin 31+32 -> hole 28 5V
Attachments
TAITO UNROM back
TAITO UNROM back
TAITO UNROM front
TAITO UNROM front

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