Search found 362 matches

by getafixx
Wed Nov 20, 2019 9:32 am
Forum: phpBB Issues
Topic: What happened to the Nesdev phpBB theme?!?!
Replies: 74
Views: 9211

Re: What happened to the Nesdev phpBB theme?!?!

Yeah this is pretty terrible. It looks like the same bland "overhaul" that happened to NintendoAge when it was bought out.

I hope this is only temporary...?
by getafixx
Wed Nov 13, 2019 11:58 am
Forum: NES Hardware and Flash Equipment
Topic: Graphics issue on an NROM board. My first Reproduction.
Replies: 29
Views: 6981

Re: Graphics issue on an NROM board. My first Reproduction.

Nugem wrote: I used a M27C512, I will ground it and re-test. Thank you very much.
Then you need to also ground A14 and A15 on your chip, otherwise you may get the same sort of issue.
by getafixx
Wed Nov 13, 2019 10:51 am
Forum: NES Hardware and Flash Equipment
Topic: Graphics issue on an NROM board. My first Reproduction.
Replies: 29
Views: 6981

Re: Graphics issue on an NROM board. My first Reproduction.

What chip did you use for CHR? If you used anything higher than a 27C64 then that pin is not NC - it's A13, and you need to wire it to GND. The reason it's missing the "ring" around the solder hole is you damaged it when pulling the old chip out. Every pin hole has a "ring" to solder to, regardless ...
by getafixx
Sat Nov 09, 2019 12:49 pm
Forum: GBDev
Topic: Latching the Real Time Clock (RTC) in MBC3
Replies: 13
Views: 1830

Re: Latching the Real Time Clock (RTC) in MBC3

Would it not be easier to just use a dedicated RTC chip (something like this) and relay that info back to the CPLD/FPGA when the console needs it? Keeps power consumption from the CPLD away from the battery.
by getafixx
Wed Oct 09, 2019 9:08 am
Forum: NES Hardware and Flash Equipment
Topic: Not using center screw for nes cartridge is fine?
Replies: 8
Views: 6322

Re: Not using center screw for nes cartridge is fine?

tepples wrote: This drawback of hot melt adhesive never stopped Drakon though.
I forgot about him... I wonder if he's still "modding" after his online reputation took a nosedive?
by getafixx
Sun Sep 29, 2019 1:46 pm
Forum: NES Hardware and Flash Equipment
Topic: MMC6 having no sound output? - EDIT fixed it
Replies: 0
Views: 4594

MMC6 having no sound output? - EDIT fixed it

I'm working on incorporating MMC6 support into my MMC3 mapper, and I've got the Star Tropics games working in that I can create and save and play the game just fine, but I have absolutely no sound output. I've tried on a clone and a couple of other consoles so far...and I can't figure out what it c...
by getafixx
Thu Sep 26, 2019 2:05 pm
Forum: NES Hardware and Flash Equipment
Topic: NES file selection menu, is there a demo for one?
Replies: 3
Views: 3734

Re: NES file selection menu, is there a demo for one?

lidnariq wrote:That's basically what the PowerPak's NES-side firmware is. Source is available, but I don't know how retargetable it would be.
Thanks for the link! I totally forgot about the PowerPak source.

But yikes... talk about jumping in with both feet. Guess I got some reading to do.
by getafixx
Wed Sep 25, 2019 2:33 pm
Forum: NES Hardware and Flash Equipment
Topic: NES file selection menu, is there a demo for one?
Replies: 3
Views: 3734

NES file selection menu, is there a demo for one?

Hey all, As the title says I'm looking for a NES rom demo or tutorial for a file selection menu. I'm fiddling with the idea of a cheap micro controller based SD flash cart, but I am not sure where to start for info about how to implement a file menu selector with a NES rom. And googling "NES file me...
by getafixx
Sun Dec 30, 2018 1:05 pm
Forum: NESdev
Topic: SimCity prototype found!
Replies: 74
Views: 25314

Re: SimCity prototype found!

GreyRogue wrote: If the source for an existing MMC5 flash cart mapper is available, it shouldn't be too hard to fix.
Krikzz released his MMC5 mapper source a while back for the EverDrive N8 cart.
by getafixx
Sun Nov 04, 2018 5:48 pm
Forum: NES Hardware and Flash Equipment
Topic: INLretro Dumper-Programmer exits to command line
Replies: 8
Views: 6562

Re: INLretro Dumper-Programmer exits to command line

A first step would be to naturally create a support ticket on his website. Nobody can help you better than the man himself.
by getafixx
Thu Oct 11, 2018 10:17 am
Forum: SNESdev
Topic: 16 bit to 8 bit multiplexers options (other than 74xx257)
Replies: 10
Views: 5893

Re: 16 bit to 8 bit multiplexers options (other than 74xx257

Why not just go the route of using a CPLD? That can easily handle all of those functions, and take up very little space.
by getafixx
Tue Aug 28, 2018 9:09 pm
Forum: Other Retro Dev
Topic: 5V compatible CPLD used as level shifter?
Replies: 8
Views: 10409

Re: 5V compatible CPLD used as level shifter?

What is the point ? You're using a CPLD as a simple buffer to lower signal voltage (for "high" logic state) from +5V to +3V. You can do the same with a simple buffer/level shifter. Why bother use a CPLD at all ? Tepples already answered below, but the idea is to use it instead of having to add addi...
by getafixx
Mon Aug 27, 2018 2:04 pm
Forum: Other Retro Dev
Topic: 5V compatible CPLD used as level shifter?
Replies: 8
Views: 10409

Re: 5V compatible CPLD used as level shifter?

lidnariq wrote:Correct, a 3V device with 5V tolerant inputs still emits its logical outputs at 3V, so are compatible with a subsequent not-5V-tolerant 3V device.
But could it be used safely in reverse, to drive the NES data bus for example?

Code: Select all

NES <---bidirectional---> CPLD <---bidirectional---> 3V ROM
by getafixx
Mon Aug 27, 2018 1:52 pm
Forum: Other Retro Dev
Topic: 5V compatible CPLD used as level shifter?
Replies: 8
Views: 10409

5V compatible CPLD used as level shifter?

I was wondering if using a 5V tolerant CPLD in between a 5V and 3V bus would cause any issues. I don't see any reason why it would, but figured I'd throw the question here to see if anyone has any reason why that isn't a good practice. Just seeing as a CPLD is needed for most custom mappers and such...
by getafixx
Mon Jul 23, 2018 2:49 pm
Forum: NES Hardware and Flash Equipment
Topic: VRC IV pinout
Replies: 22
Views: 22305

Re: VRC IV pinout

Thanks! I'll give these a go.