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Contra - Revenge of the Red Falcon
http://forums.nesdev.com/viewtopic.php?f=28&t=14829
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Author:  Tormenter [ Wed Sep 14, 2016 10:37 am ]
Post subject:  Contra - Revenge of the Red Falcon

Anyone ever get this game working on real hardware? I've seen it done, but I can't seem to get it working, purple screen every single time =( I have done other unrom games with no problem.

Author:  lidnariq [ Wed Sep 14, 2016 11:00 am ]
Post subject:  Re: Contra - Revenge of the Red Falcon

Can you get the same bug to happen in any emulator?

Author:  Tormenter [ Wed Sep 14, 2016 11:25 am ]
Post subject:  Re: Contra - Revenge of the Red Falcon

lidnariq wrote:
Can you get the same bug to happen in any emulator?



Nope plays fine in that. I tried several different roms I found, and wasted 5 UNROM boards trying to get it going =(

Author:  Ice Man [ Wed Sep 14, 2016 11:51 am ]
Post subject:  Re: Contra - Revenge of the Red Falcon

You do realise it is 256kb PRG ROM and needs an UOROM board.
UNROM only holds 128kb of PRG ROM.

Or rewire the 74'32 and 74'161 to UOROM to not waste more UNROM boards.

Author:  krzysiobal [ Wed Sep 14, 2016 12:12 pm ]
Post subject:  Re: Contra - Revenge of the Red Falcon

Works fine.
Image Image

Author:  tokumaru [ Wed Sep 14, 2016 1:19 pm ]
Post subject:  Re: Contra - Revenge of the Red Falcon

Ice Man wrote:
Or rewire the 74'32 and 74'161 to UOROM to not waste more UNROM boards.

Actual UOROM boards are certainly much harder to come by than UNROM ones, so this might indeed be a better option. I did this a long time ago (pics are gone, sorry), and as far as I can remember, it wasn't hard.

Author:  krzysiobal [ Wed Sep 14, 2016 2:10 pm ]
Post subject:  Re: Contra - Revenge of the Red Falcon

You need to cut-off the VCC from pin 6 in 74*161 and connect CPU-D3 to it.
Then pin 11 of 74*161 wire to pin 1 of 74*32, then pin 4 of 74*32 to pin 2 of 74*32 and finally pin 3 of 74*32 to A17 address line of your PRG-ROM

Attachments:
unrom.png
unrom.png [ 55.31 KiB | Viewed 3233 times ]

Author:  Ice Man [ Thu Sep 15, 2016 4:08 am ]
Post subject:  Re: Contra - Revenge of the Red Falcon

Here simplified:
UNROM -> UOROM conversion (mapper 2):
Bend up pin 6 of 74HC161
Bend up pins 9 and 10 from 74HC32
Connect pin 9 from 74HC32 to pin 2,5, or 12 of 74HC32 so all 4 are connected together.
Connect pin 11 of 74HC161 to pin 10 of 74HC32
Connect pin 6 of 74HC161 to D3 of PRG ROM
Connect pin 8 of 74HC32 to A17 of PRG ROM

Author:  Tormenter [ Fri Sep 23, 2016 8:27 pm ]
Post subject:  Re: Contra - Revenge of the Red Falcon

Ice Man wrote:
Here simplified:
UNROM -> UOROM conversion (mapper 2):
Bend up pin 6 of 74HC161
Bend up pins 9 and 10 from 74HC32
Connect pin 9 from 74HC32 to pin 2,5, or 12 of 74HC32 so all 4 are connected together.
Connect pin 11 of 74HC161 to pin 10 of 74HC32
Connect pin 6 of 74HC161 to D3 of PRG ROM
Connect pin 8 of 74HC32 to A17 of PRG ROM



And the PRG is wired the same as normal I assume?


PRG Socket:
Bend up pins 1, 2, 24, 31 and 32
Solder pin 1 to pins 30, 31 and 32
Solder pin 2 to hole 24
Solder pin 24 to pin 16

Author:  Tormenter [ Fri Sep 23, 2016 9:28 pm ]
Post subject:  Re: Contra - Revenge of the Red Falcon

krzysiobal wrote:
You need to cut-off the VCC from pin 6 in 74*161 and connect CPU-D3 to it.
Then pin 11 of 74*161 wire to pin 1 of 74*32, then pin 4 of 74*32 to pin 2 of 74*32 and finally pin 3 of 74*32 to A17 address line of your PRG-ROM



That diagram is way over my head. Dont even see a 27c020 or know what chips are the 74*32 or 74*161 on the diagram hehe

Author:  Tormenter [ Fri Sep 23, 2016 9:36 pm ]
Post subject:  Re: Contra - Revenge of the Red Falcon

This is what I tried twice and come out with a purple screen.


Image

Author:  Ice Man [ Sat Sep 24, 2016 2:10 am ]
Post subject:  Re: Contra - Revenge of the Red Falcon

PRG soldered as usual.

Too many wires on the 74'32, I'll make it more clear:

UNROM -> UOROM conversion (mapper 2):
Bend up pin 6 of 74HC161
Bend up pins 9 and 10 from 74HC32
Connect pin 9 from 74HC32 to pin 2 of 74HC32 (2,5 and 12 are already connected together)
Connect pin 11 of 74HC161 to pin 10 of 74HC32
Connect pin 6 of 74HC161 to D3 of PRG ROM (DO NOT LIFT this pin)
Connect pin 8 of 74HC32 to A17 of PRG ROM

Other than that, for PRG:
Bend up pin 1, 2, 24, 31 and 32
Solder pin 2 to hole 22 (A16)
Solder pin 24 to GND (OE)
Solder pin 30 to to pin 8 of 74HC32
Solder pin 31 and 32 to hole 28 (+5V)

Author:  Fisher [ Sat Sep 24, 2016 5:56 pm ]
Post subject:  Re: Contra - Revenge of the Red Falcon

Well, I feel kind of hard to understand when someone writes what should be plugged where.
Most of the time, I need to draw what needs to be done, so I can understand.
I think this can give a little more help :-)

viewtopic.php?p=83131#p83131

Author:  Tormenter [ Sat Sep 24, 2016 11:33 pm ]
Post subject:  Re: Contra - Revenge of the Red Falcon

You said pin 31 and 32 to hole 28....so should pin 30 be lifted? I have not tried lifting it yet, but getting purple screen with it not lifted and pin 31 and 32 tied to pin 30

Author:  Tormenter [ Mon Sep 26, 2016 11:54 pm ]
Post subject:  Re: Contra - Revenge of the Red Falcon

So tried with it lifted and not lifted. (Pin 30). Here is where I am at now, still purple screen =(

Image

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