Search found 122 matches

by qwertymodo
Sat Oct 13, 2012 7:17 pm
Forum: 1990's Gaming
Topic: Official SNES controllers using 4021's
Replies: 1
Views: 1925

Official SNES controllers using 4021's

I recently purchased a bunch of PAL SNES controllers, and was surprised to find that some of them contained a pair of 4021 IC's rather than the typical single V520B. This may not be news to anybody, but I hadn't heard of it before or seen one before, and I thought it was interesting. I have seen PAL...
by qwertymodo
Sat Oct 13, 2012 7:14 pm
Forum: The Trading Post
Topic: FS: Nonvolatile 1M (4x) N64 Memory Cards
Replies: 32
Views: 20433

Re: FS: Nonvolatile 1M (4x) N64 Memory Cards

Ok, so I finally got one of the 1x cards working consistently without the battery. It took me a little bit to understand the passive circuitry to work out why it worked fine with the battery and failed without it, despite the memory being nonvolatile. I have a couple other thoughts I'm going to play...
by qwertymodo
Sat Oct 13, 2012 3:12 pm
Forum: The Trading Post
Topic: FS: Nonvolatile 1M (4x) N64 Memory Cards
Replies: 32
Views: 20433

Re: FS: Nonvolatile 1M (4x) N64 Memory Cards

However, the digital route would be kind of nice, I'd just need a 4-bit counter and a decoder (and maybe one of these since it would be nice to remember which card you were using last time). Of course, a 2-digit 7-segment display would be nice as well. I mean heck, if I'm going to go over the top, m...
by qwertymodo
Sat Oct 13, 2012 3:07 pm
Forum: The Trading Post
Topic: FS: Nonvolatile 1M (4x) N64 Memory Cards
Replies: 32
Views: 20433

Re: FS: Nonvolatile 1M (4x) N64 Memory Cards

Probably 2x4-way switches. It would be a bit tricky since the 4Mbit chips are 16-bit. They do, however, have a byte-mode operation mode, so they can work as 8-bit, it just makes the bank switching more complicated. Also, all said and done, I'd probably have to charge at least $80 for it. Yes, I have...
by qwertymodo
Sat Oct 13, 2012 4:00 am
Forum: The Trading Post
Topic: FS: Nonvolatile 1M (4x) N64 Memory Cards
Replies: 32
Views: 20433

Re: FS: Nonvolatile 1M (4x) N64 Memory Cards

Yeah, there's no way to have a card bigger than 256Kbit without bank switching. Any way, I tried building one tonight and it works... sporadically. The chip I used was a pull from another project and it might have gotten fried. Actually, it's quite likely that's exactly what happened. I've settled o...
by qwertymodo
Mon Oct 08, 2012 4:10 pm
Forum: The Trading Post
Topic: FS: Nonvolatile 1M (4x) N64 Memory Cards
Replies: 32
Views: 20433

Re: FS: Nonvolatile 1M (4x) N64 Memory Cards

Some good news, and some news I'm really just not sure about... I got my free F-RAM samples today to play around with, but it turns out I ordered the wrong part numbers... I accidentally ordered the 4Mbit chips instead of the 1Mbit chips. It should still work (16x card, anyone?), but the chips are $...
by qwertymodo
Mon Oct 08, 2012 11:17 am
Forum: 1990's Gaming
Topic: Cart emulator progress thread
Replies: 403
Views: 159190

Re: Cart emulator progress thread

Does anybody know if the Gameshark save backup compression has been figured out? I know it's only tangentially related to the 64Drive, but the addition of memory pak management made me think of it. For those of you who don't know, the N64 Gameshark had a feature that allowed backing up a save file f...
by qwertymodo
Sat Sep 29, 2012 5:56 pm
Forum: The Trading Post
Topic: FS: Nonvolatile 1M (4x) N64 Memory Cards
Replies: 32
Views: 20433

Re: FS: Nonvolatile 1M (4x) N64 Memory Cards

Some good news, for anyone that's curious. The latest 64Drive menu appears to have added Memory Pack dumping, so I will be able to offer data transfers if and when I manage to get this all figured out. Also, seeing as it's already been established that the Ramtron F-RAM chip does work in this applic...
by qwertymodo
Fri Sep 28, 2012 11:56 pm
Forum: 1980's Gaming
Topic: NES, voltage & amps
Replies: 6
Views: 8982

Re: NES, voltage & amps

Kumimono wrote:USB 3 is about 900 amps... Wouldn't risk it. :)
900 MILLI amps... 900 amps would require (crunches some numbers in my head...) a 4.5kw power supply, and that's if all of the power was fed straight into the USB port. Holy balls >.<
by qwertymodo
Fri Sep 28, 2012 10:18 pm
Forum: The Trading Post
Topic: FS: Nonvolatile 1M (4x) N64 Memory Cards
Replies: 32
Views: 20433

Re: FS: Nonvolatile 1M (4x) N64 Memory Cards

Sorry, my summer was crazy. Worked 2 jobs, 60 hours a week. I now have a new laptop and don't have all my projects moved to the new machine. I'm still interested in pursuing this, but I got hung up on the SNES FRAM conversion (which sadly still isn't working), so it will be awhile before I can commi...
by qwertymodo
Fri Sep 28, 2012 5:16 pm
Forum: 1990's Gaming
Topic: GameShark LED Re-Enabling
Replies: 1
Views: 2097

Re: GameShark LED Re-Enabling

It's a standard part, just be sure you get the 74HC, not 74LS or anything else like that.
by qwertymodo
Fri Sep 28, 2012 5:05 pm
Forum: 1990's Gaming
Topic: Looking for N64 3rd Party Expansion Pak info
Replies: 0
Views: 2566

Looking for N64 3rd Party Expansion Pak info

I'm wanting to take a shot at an N64 on-board RAM transplant, and towards that goal, I need 2 4Mbit RAM chips. I know I can get one out of an official Expansion Pack, but those are a bit expensive, so I was wanting to know if anyone can tell me which 3rd party Expansion Packs use 1 4Mbit chip as opp...
by qwertymodo
Wed Jul 25, 2012 8:44 am
Forum: 1990's Gaming
Topic: Trouble with hard wiring SNES controller
Replies: 2
Views: 2441

Re: Trouble with hard wiring SNES controller

If the B button works, but nothing else does, I would bet the problem is with the CLK line (yellow wire). Check not only the wire, but also follow the trace on the board coming out from that hole for continuity and make sure you didn't mess up the trace when you desoldered the connector.
by qwertymodo
Fri Jul 06, 2012 5:11 pm
Forum: 1980's Gaming
Topic: DMG Gameboy Ribbon Cable
Replies: 6
Views: 9445

Re: DMG Gameboy Ribbon Cable

Well, that was the wrong pitch :( I got it figured out though, 1.25mm pitch, not 1.0. Unfortunately, I can't get any 1.25mm pitch samples from Molex, but I believe they should work. Also, Molex doesn't have SMD connectors in the 1.25 pitch, so no drop-in replacement. Kyocera has a line of 1.25mm SMD...
by qwertymodo
Tue Jul 03, 2012 6:25 pm
Forum: Technical Questions and Answers
Topic: Question about LiPo battery + charge circuit
Replies: 1
Views: 5553

Question about LiPo battery + charge circuit

I've read a lot about Li+/LiPo charging and the circuitry necessary for safe charging, and while I have a grasp on the general concept, I really can't figure out the specifics for the design I'm working on, so I figure this is a good place to come and ask. I mean hey, you guys build portable console...