Search found 122 matches

by qwertymodo
Fri Jun 29, 2012 10:17 am
Forum: 1990's Gaming
Topic: SNES Nonvolatile SRAM board
Replies: 16
Views: 26750

Re: SNES Nonvolatile SRAM board

Can anybody confirm this schematic? The part marked FM18L08 is actually going to be an FM28V020, but the footprint and pinout are the same, so for the sake of the schematic, it's fine (I'm just too lazy to add the new part). The _A/A_ and _D/D_ signals indicate the two sides of the level shifter. _A...
by qwertymodo
Thu Jun 28, 2012 6:33 pm
Forum: 1990's Gaming
Topic: SNES Nonvolatile SRAM board
Replies: 16
Views: 26750

Re: SNES Nonvolatile SRAM board

Ok, I'm just ordered some level shifters, so I'll try it one more time with the FM28V020 properly driven (LDO regulator + level shifters on all logic lines). If this doesn't work, then I'm calling it a bust unless anyone else has any ideas. Especially after the amount of pain I went through to hand ...
by qwertymodo
Mon Jun 25, 2012 7:39 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

I would offer pak cloning as part of the deal if I had a computer with a serial port... but I don't, so no DexDrive. >.<
by qwertymodo
Fri Jun 22, 2012 4:46 pm
Forum: 1990's Gaming
Topic: SuperCIC (key) PCB
Replies: 0
Views: 3695

SuperCIC (key) PCB

I've been playing around with EAGLE a bit more to get more comfortable with it, and I decided to whip up a couple of simple boards. I doubt I'll actually get this one fabricated; at most, I'd use 2 of them, and I doubt there's much demand for SuperCIC keys broken out to the original footprint (mostl...
by qwertymodo
Mon Jun 18, 2012 5:57 pm
Forum: 1990's Gaming
Topic: SNES Nonvolatile SRAM board
Replies: 16
Views: 26750

Re: SNES Nonvolatile SRAM board

No luck, I've tried twice more with my two remaining samples, once with A13/A14 lifted and grounded and once with them grounded without lifting them. The one where I didn't lift A13/A14 won't even boot when attached to the cart (but the cart boots just fine without any SRAM at all), and the one with...
by qwertymodo
Mon Jun 18, 2012 11:52 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

Ok, after pulling apart several third-party 1M controller paks to get a good idea of the circuitry involved, I finally found one that I think will be simple to replicate easily (just diodes and resistors + a single memory chip). Once I trace out the connections, I can start work on building one myse...
by qwertymodo
Mon Jun 18, 2012 11:49 am
Forum: 1980's Gaming
Topic: DMG Gameboy Ribbon Cable
Replies: 6
Views: 9445

Re: DMG Gameboy Ribbon Cable

Alright, I have a possible match. I'll order a sample and see if it works :)

http://www.molex.com/molex/products/dat ... ECTORS.xml
by qwertymodo
Mon Jun 18, 2012 11:33 am
Forum: 1980's Gaming
Topic: DMG Gameboy Ribbon Cable
Replies: 6
Views: 9445

Re: DMG Gameboy Ribbon Cable

Just thought I'd post here to report (if for no other reason than to be able to reference it myself later) that the proper name for this type of ribbon cable is FFC (Flexible Flat Cable) and sometimes misnamed FPC (Flexible Printed Circuit), so that should help in my search (or if anybody else cares...
by qwertymodo
Sat Jun 16, 2012 8:34 pm
Forum: 1990's Gaming
Topic: SNES Nonvolatile SRAM board
Replies: 16
Views: 26750

Re: SNES Nonvolatile SRAM board

Unfortunately, my only access to a logic analyzer or oscilloscope was in the university EE labs, and school just got out for the year. I considered the fact that I might have fried the chip, so I am willing to try once more (I have 3 samples of the FM28V020's), but at least I know the rest of the SN...
by qwertymodo
Sat Jun 16, 2012 2:02 pm
Forum: 1990's Gaming
Topic: SNES Nonvolatile SRAM board
Replies: 16
Views: 26750

Re: SNES Nonvolatile SRAM board

Bummer, the FM28V020 (with a 5V->3.3V LDO regulator and A13/A14 pulled to GND) doesn't work either. It has its own strangeness. The FM16W08 has no weird symptoms, it just doesn't actually save. You save, it says it succeeded, you go to load and there's nothing. The FM28V020, on the other hand, cause...
by qwertymodo
Sat Jun 16, 2012 11:09 am
Forum: 1990's Gaming
Topic: SNES Nonvolatile SRAM board
Replies: 16
Views: 26750

Re: SNES Nonvolatile SRAM board

Ok. I've found one thing that might be an issue. Does the SNES pulse /CE on the cart or does it just pull it to GND? The FeRAM latches addresses on the falling edge of /CE, so if the SNES is just pulling it to GND, then that would explain it.
by qwertymodo
Sat Jun 16, 2012 10:58 am
Forum: 1990's Gaming
Topic: SNES Nonvolatile SRAM board
Replies: 16
Views: 26750

Re: SNES Nonvolatile SRAM board

Ok, so it doesn't work :( I tested all the traces for continuity and checked my soldering for bridges, so now I'm at the point of thinking perhaps the chip just isn't compatible. I'm poring over the relevant datasheets, but so far coming up empty. If anybody with more insight into such things would ...
by qwertymodo
Fri Jun 15, 2012 5:50 pm
Forum: The Trading Post
Topic: Non volatile n64 memory card and game cart
Replies: 2
Views: 3180

Re: Non volatile n64 memory card and game cart

Looks like it won't be that easy, unfortunately. Looks like the ROM and SRAM both use additional internal logic for multiplexing the addresses, as opposed to the SNES where address decoding was handled by an external chip (MAD-1 or 74xxx). I don't think SSB can be done easily. The memory card is ano...
by qwertymodo
Fri Jun 15, 2012 1:54 pm
Forum: The Trading Post
Topic: Non volatile n64 memory card and game cart
Replies: 2
Views: 3180

Re: Non volatile n64 memory card and game cart

The main problem with SSB (or any N64 SRAM games) is that I can't seem to find the datasheet, or even just the pinout, for the SHARP LH52V246 chip. If anybody happens to have that pinout, then I could look in to modding it. The controller pak has been done before and is well documented as well, so n...
by qwertymodo
Fri Jun 15, 2012 10:09 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

I'll have to take a look at SSB to see what chip they're using for saving (I know it's SRAM, but I don't know the pinout or capacity or even the package). I have a copy, so I'll take a look when I get home. Right now, I haven't had the time to look into actually designing the cards that I'm discussi...