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and what about using a 27C512 in an 1024Kb UNROM? what should be done with the hole for the highest address pin? Do you mean a 27C010/27C020 (1024/2048 Kb)? Since the 27C512 is only 512Kbits. I'm a cheap guy that uses EPROMs and I've found the best way for me is to go with the 27C512s (28 pins) for...

Does a SGROM board even have pads for WRAM? As for decoding, there's no way it can't, since the MMC1 must already have /CART, PRG A14, and PRG A13 connected so it can decode the MMC1 register addresses. Those are enough (and M2, which is also connected) to generate the CE for WRAM. The MMC1B2 is in...

Sweet thanks. Then I'm thinking of converting my SGROM (PRGROM+CHRRAM) to an SNROM. So what I'd have to do is have address decoding to assign the NV WRAM addresses $6000-7FFF (8 kb). Hopefully it wouldn't be any more complicated than that. The SG has a 6113B1 and MMC1B2. Can I use the address decodi...

I have an MMC1 cart with CHRRAM and I want to use it for a game with save slots. Would the save slots be in the same address range as the CHRRAM? If so then I'd just hook up the battery to RAM VCC using this topic as a reference. If I'm on the right track, then what range of voltage should be at CHR...

Well, I've bought some OTP's in the past (by accident actually), and they were cheap but I don't have a great success rate just soldering them in yet. After shipping I averaged about a buck a piece for 40 reprogrammable 256k x 8's here , which seems like one hell of a deal even if a few don't work. ...

haha, I'm going to take a stab at answering my own question. An EPROM pull is a used EPROM which was "pulled" out of it's original circuit, right?

I need some more eproms and found some eprom pulls. The site gave a description: "Fully [UV] erasable 27C020 EPROM pulls have straight full length leads.... Nice quality - no solder- full length leads- used. G13797". Are there any other surprises waiting in store for me? I'd just hate to o...

I don't think I've ever seen credits for a console game with just 2 or 3 names (I've never played atari either though). For example, MM1 credits: 1 planner 4 character designers 1 programmer 2 sound programmers Granted, people are using a lot more advanced tools now than back in the day, but that's ...

Maybe the problem is lack of collaboration. You don't see any commercial video games that just have one name in the credits (though it would be interesting if anybody knew of any exceptions).

Whichever way you go, there's a lot of move control you can add based off of context. Just as an example: Double Dragon 2: a = punch b = kick a+b = jump -> after the opponent's been hit = grab a while the opponent's grabbed = knee to the face down + a while the opponents grabbed = elbow to the head ...

"I understand this method would be slow like you said but what are the better/other ways to do it?" Somebody already mentioned this, but store the graphics data that needs to be modified in the CPU's RAM (with the value you initially write to the PPU). Later when you need to modify the gra...

Ok, it sends out a composite video signal.

And it sounds like the PPU is an FPGA not a microprocessor, is that right?

Is it a derivative of the 6502? And (briefly) how does it send images to the TV or communicate with the CPU?

As always thanks for your time.

How do you know if an EPROM has been erased or if it still has data on it?

You still have to get the programmer, don't you? =)

That's alright. Instead of buying the programmer myself I'm pretty sure I can get my wife to buy it for me for Christmas. I think getting a programmer for Christmas will officially make me a geek. (Yes, I'm in!)