Vs. roms on an NES - NESdev BBS

Vs. roms on an NES
by rbudrick on 2007-09-04 (#26709)

So the PowerPak can run Vs. roms. How do I mod an NES to have a coin slot? Yeah, I know colors would be messed up on most games.

How do I add a second monitor for Playchoice games to the crap on the other screen? I know probably impossible, but I thought I'd ask.

-Rob

by Dwedit on 2007-09-04 (#26710)

Run it on a famicom and blow into the second controller

by Dwedit on 2007-09-04 (#26717)

Okay, for real, you hack the rom to respond to Select to insert coins instead of the other way. I did it once when I hacked VS SMB to be mapper 3.

by bunnyboy on 2007-09-04 (#26718)

You have to add in extra vram, wram, and some data lines. The vram and wram can be done from the cart side (I believe the PowerPak provides for both right now...). The data lines have to be soldered on the NES side, it is not something the cart can electrically do.

There is a very good site explaining it at http://www.raphnet.net/electronique/nes_vs/nes_vs_en.php. Skip to step 7 and 8 (pages 9 and 10) for the coin and dips part. The mic in the second controller for Famicom uses one of those extra data lines, which is why blowing on it works

Palette changes are also explained there, but it can also be done by changing the palette already in rom instead of adding a new subroutine.

Pretty much forget about doing the Playchoice dual monitors. Those are driven by a separate Z80 processor.

by tepples on 2007-09-05 (#26720)

bunnyboy wrote:
Pretty much forget about doing the Playchoice dual monitors. Those are driven by a separate Z80 processor.

Unless you want to try hacking them to run on a connected Sega Master System or something

by rbudrick on 2007-09-05 (#26721)

tepples wrote:
bunnyboy wrote:
Pretty much forget about doing the Playchoice dual monitors. Those are driven by a separate Z80 processor.

Unless you want to try hacking them to run on a connected Sega Master System or something

Lol, 10 cookies to whoever makes that happen!

-Rob

by No Carrier on 2007-09-06 (#26740)

I'm sure evildragon can do it.. or at least say he did it for three days, before he gives in and says it was all a hoax.

NC

rbudrick wrote:
tepples wrote:
bunnyboy wrote:
Pretty much forget about doing the Playchoice dual monitors. Those are driven by a separate Z80 processor.

Unless you want to try hacking them to run on a connected Sega Master System or something

Lol, 10 cookies to whoever makes that happen!

-Rob

by tokumaru on 2007-09-06 (#26781)

No Carrier wrote:
I'm sure evildragon can do it.. or at least say he did it for three days, before he gives in and says it was all a hoax.

How can we ever forget that?! =)

by rbudrick on 2007-09-07 (#26793)

No really. All this can be yours.

-Rob