Search found 371 matches

by getafixx
Mon Oct 05, 2020 10:30 am
Forum: NES Hardware and Flash Equipment
Topic: iNes mapper 163 vhdl code for XC9536???
Replies: 19
Views: 3725

Re: iNes mapper 163 vhdl code for XC9536???

Isn't a XC9536 only have 36 macrocells? The XC9572 is pin-compatible with a XC9536 of the same package. Both of those are obsolete products, though, so you may want to check out the XL variant. It's a 3V part so you'll need a voltage regulator, but they have 5V tolerant I/O so level shifting isn't ...
by getafixx
Mon Aug 31, 2020 12:25 pm
Forum: GBDev
Topic: Scrolling hum bar when using GBA Flash carts on NDS Lite
Replies: 1
Views: 1388

Scrolling hum bar when using GBA Flash carts on NDS Lite

I have found a weird issue when using a NDS Lite to play GBA Flash carts. It's tough to capture on camera, but if you watch the sleeping man in the lower right side you can see it in your peripheral vision: https://www.dropbox.com/s/x20jtkrl61ubf92/2020-08-31%2013.17.57.mp4?dl=0 I can see it on the ...
by getafixx
Mon Aug 24, 2020 9:06 pm
Forum: SNESdev
Topic: SuperCIC for PIC10F322
Replies: 34
Views: 13964

Re: SuperCIC for PIC10F322

Like Mark's findings, I had a similar issue with one of my old designs that used the 27C322 chips. It turned out that using 74LS257 instead of 74HCT257 fixed it for the consoles that were picky. It worked on any console, 100% of the time, if using the LS branded chips. With the HCT it was fine on al...
by getafixx
Fri Aug 21, 2020 10:18 am
Forum: General Stuff
Topic: Looks like NESCartDB is down (again)...
Replies: 75
Views: 47391

Re: Looks like NESCartDB is down (again)...

Has anyone cloned this site yet?

I might be able to get a back-up of it hosted temporarily, if someone has a back-up.
by getafixx
Fri Aug 07, 2020 9:53 am
Forum: NES Hardware and Flash Equipment
Topic: AX5904 MM1 clone incompatibility, or RAM issue?
Replies: 6
Views: 4063

Re: AX5904 MM1 clone incompatibility, or RAM issue?

I finally got round to testing this with 100ns RAM (as I mentioned, I was using 55ns before). Unfortunately, nothing changed :( Maybe 120ns is really the fastest you can go without issues. I wonder if it would be possible to create a small delay on the /CE line with just a capacitor and a resistor....
by getafixx
Fri Jun 19, 2020 10:17 am
Forum: Reproduction
Topic: SNES game PCB cartridge with chip vs battery to save
Replies: 10
Views: 3439

Re: SNES game PCB cartridge with chip vs battery to save

I see that picture shows a Ramtron part, that company no longer exists but I believe was bought by Fujitsu. I suppose it's possible they kept the Ramtron branding, I don't know, seems doubtful. Could be old stock or recycled. They re-branded. Those chips are FM18W08 (or FM28V020 for 3.3V systems), ...
by getafixx
Fri May 15, 2020 12:10 pm
Forum: NES Hardware and Flash Equipment
Topic: MMC1 free implementation on CPLD released
Replies: 34
Views: 13375

Re: MMC1 free implementation on CPLD released

Just double checked mine, i've only got 49 LE used for a full MMC1 - and that could even be trimmed down a few LE if I cleaned things up. Capture.PNG I see the name in your screenshot is "CoolBoy", though. So i'm assuming this isn't *just* the MMC1, but an MMC1 with a bunch of extra logic needed for...
by getafixx
Sat Mar 21, 2020 9:26 am
Forum: SNESdev
Topic: SuperCIC 12F629 problem with Super Famicom console
Replies: 11
Views: 5326

Re: SuperCIC 12F629 problem with Super Famicom console

Actually retrostage had reset issues too, in some of his earlier designs. Maybe he has better ground flooding. I am not familiar with his layouts so I don’t know. The older designs had issues with cross-talk, but those were rectified back in 2015. The issue was mainly just lazy routing, TBH. But ho...
by getafixx
Fri Mar 13, 2020 8:28 am
Forum: Reproduction
Topic: TL-ROM Splatterhouse
Replies: 55
Views: 14653

Re: TL-ROM Splatterhouse

The MMC3 hack of Splatterhouse uses W-RAM doesn't it? In which case you need a TSROM donor, not TLROM.
by getafixx
Wed Nov 20, 2019 9:32 am
Forum: phpBB Issues
Topic: What happened to the Nesdev phpBB theme?!?!
Replies: 79
Views: 35111

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: 10757

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: 10757

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: 5697

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: 8289

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: 8232

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...