Search found 533 matches

by Markfrizb
Tue Oct 20, 2020 8:22 am
Forum: Reproduction
Topic: Sharing my project: A Sega Genesis Cartridge PCB with FeRAM support
Replies: 4
Views: 584

Re: Sharing my project: A Sega Genesis Cartridge PCB with FeRAM support

I don't know how the extra signals on the Genesis cart bus compare to the signals straight out of the 68k itself, but in a bare 68k, the address bus is marked as stable by the /AS signal being low. I assume that the bus arbiter doesn't assert any of the relevant signals (B16, B17, B21, B26) unless ...
by Markfrizb
Mon Oct 19, 2020 6:31 pm
Forum: Reproduction
Topic: Sharing my project: A Sega Genesis Cartridge PCB with FeRAM support
Replies: 4
Views: 584

Re: Sharing my project: A Sega Genesis Cartridge PCB with FeRAM support

Hello, Its been some time since i've wanted to do this, but was unsure if posting Sega stuff in NesDev would be acceptable. I've talked to B00daW about it and he said that it would not be a problem. This is already posted in Racketboy and i though that it would be fair to share here as much of the ...
by Markfrizb
Mon Sep 07, 2020 7:27 pm
Forum: NES Hardware and Flash Equipment
Topic: Can't Get Battery Saved SNES Games To Work Or Save With Muramasa PCB Boards
Replies: 7
Views: 2431

Re: Can't Get Battery Saved SNES Games To Work Or Save With Muramasa PCB Boards

It appears that your sram is actually an 8k ram and your jumpers are set for 32k. Maybe that’s the issue??
by Markfrizb
Tue Aug 25, 2020 10:18 pm
Forum: SNESdev
Topic: SuperCIC for PIC10F322
Replies: 34
Views: 11019

Re: SuperCIC for PIC10F322

I really believe your issues are all related to cross talk. I think if you isolate and ground plane those traces, you should be good. I think the LS series chips help with noise, it’s been a looong time since I researched those so I could be wrong, but I think the SCHOTTKY process helps with noise. ...
by Markfrizb
Tue Aug 25, 2020 8:46 pm
Forum: SNESdev
Topic: SuperCIC for PIC10F322
Replies: 34
Views: 11019

Re: SuperCIC for PIC10F322

Sorry about that. It does suck, I know. Prototypes are essential before any large order.
If you want, PM me and maybe you could send me a sample to tinker with. I’ve used the 10F322’s exclusively now for a few years. After that one hiccup I mentioned earlier, it’s been golden.
by Markfrizb
Tue Aug 25, 2020 1:38 pm
Forum: SNESdev
Topic: SuperCIC for PIC10F322
Replies: 34
Views: 11019

Re: SuperCIC for PIC10F322

Iirc, there are about 8 snes OEM variants....
I sold all my unique consoles to HD Retrovision when he was testing his HD cable sets years ago.
by Markfrizb
Mon Aug 24, 2020 9:42 pm
Forum: SNESdev
Topic: SuperCIC for PIC10F322
Replies: 34
Views: 11019

Re: SuperCIC for PIC10F322

You know I was just starting to feel confident that my designs were nearing a final revision and that I wouldn't have to touch them again. I guess it'll never end... That never ends.... lol. I’m rapidly approaching the end of the alphabet for revisions on a few designs... Keep the CIC traces far aw...
by Markfrizb
Mon Aug 24, 2020 8:52 pm
Forum: SNESdev
Topic: SuperCIC for PIC10F322
Replies: 34
Views: 11019

Re: SuperCIC for PIC10F322

I had a similar issue years ago where a pcb I made worked perfectly on most consoles but there were a few consoles that it crashed on (CIC related both 10F322 and 629). I had managed to acquire most of the snes consoles revisions to test on. There were definitely consoles that were more forgiving th...
by Markfrizb
Mon Aug 24, 2020 6:08 pm
Forum: SNESdev
Topic: SuperCIC for PIC10F322
Replies: 34
Views: 11019

Re: SuperCIC for PIC10F322

What happens if you power cycle or reset a few times? When it detects a “wrong” region, it will switch over and you must power cycle or reset the console. Or if the pairing with the console goes awry, it’ll switch regions. Usually a reset twice will switch it back to whatever the consoles region is....
by Markfrizb
Sat Aug 08, 2020 8:26 pm
Forum: SNESdev
Topic: Good free snes cart design
Replies: 4
Views: 3358

Re: Good free snes cart design

Muramasa Entertainment sells universal SFC/SNES shells as well as the American square ones. There are also various PCBs with support for Lo-ROM, Hi-ROM and battery-backed SRAM. I haven't tried them yet myself, so I can't say if they are any good or not. They also have Famicom and NES PCBs with shel...
by Markfrizb
Wed Jul 29, 2020 6:00 am
Forum: SNESdev
Topic: SNES SRAM Test ROM
Replies: 9
Views: 2877

Re: SNES SRAM Test ROM

Here's what I want to do with it: I offer PCBs with parts pre-mounted, and I recently found some surface mount SRAM to try out. My plan is to be able to produce carts with everything already on the board, except the EPROM. I designed a programming board with a SNES cart connector on it so I can plu...
by Markfrizb
Tue Jul 28, 2020 8:28 pm
Forum: SNESdev
Topic: SNES SRAM Test ROM
Replies: 9
Views: 2877

Re: SNES SRAM Test ROM

I guess what makes the most sense is to have some external device run a cart integrity test before something is actually mounted on the cart.
by Markfrizb
Tue Jul 28, 2020 7:42 pm
Forum: SNESdev
Topic: SNES SRAM Test ROM
Replies: 9
Views: 2877

Re: SNES SRAM Test ROM

Huh? To what end? You’re asking for a program that would test the pcb that it’s installed into? Testing itself? Not sure I follow what you are asking about.
by Markfrizb
Tue Jul 28, 2020 1:13 pm
Forum: Reproduction
Topic: Advice for tracks tolerance of Router SNES PCB
Replies: 5
Views: 1251

Re: Advice for tracks tolerance of Router SNES PCB

I wish someone would have laid out a perfect design when I was learning about all this....but then, I wouldn't have learned as much. My best mistakes were the ones I learned the most from. Contact your pcb shop and ask them what they recommend, or what their machines are capable of without extra cos...
by Markfrizb
Sat Jun 20, 2020 2:00 pm
Forum: Reproduction
Topic: SNES game PCB cartridge with chip vs battery to save
Replies: 10
Views: 2871

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

FM18W08 unit price: qty 1 28$, qty 1000 19$. Yikes, the only way those chinese can afford to put them in snes repros if they can pull them for free from some junked equipment. Mouser and Digikey sells them for $17 range... the 64k version is around $9....still too expensive. How fast does a sram ne...