Search found 507 matches

by Markfrizb
Wed Feb 26, 2020 9:16 am
Forum: SNESdev
Topic: Sufami Turbo
Replies: 1
Views: 10

Sufami Turbo

I was recently asked about a little known Sufami Turbo game (Car Rangers) and I was intrigued on how this system worked. The Wiki on this system is here: https://en.wikipedia.org/wiki/Sufami_Turbo So I acquired a base and a few sub cartridges to research. Although I have Zero interest in making a re...
by Markfrizb
Wed Jan 29, 2020 10:45 am
Forum: Reproduction
Topic: (SNES) Changing Chrono Trigger (J) into (U)
Replies: 16
Views: 2555

Re: (SNES) Changing Chrono Trigger (J) into (U)

Update on this: The MAX4674's were a winner. The game works perfectly with these multiplexers. I don't think most people use the 74HC T 257s, there might be a reason there why it didn't work right. The HCTs are slightly slower per the spec sheet but not by much. I connected /RD to the MAX4674 /EN i...
by Markfrizb
Tue Jan 07, 2020 12:34 pm
Forum: SNESdev
Topic: SNES cart chip database
Replies: 7
Views: 1512

Re: SNES cart chip database

Thanks for mentioning that. It's not my database and I'm not sure if jensma is actually still working on it but I can let him know. I just glanced at the first page and noticed that. I revisited the page and saw several more instances, not just 32kB/256kb but also 2kB/16kb mixtures. It would be eas...
by Markfrizb
Tue Jan 07, 2020 9:32 am
Forum: SNESdev
Topic: SNES cart chip database
Replies: 7
Views: 1512

Re: SNES cart chip database

Ice Man wrote:
Fri Jan 03, 2020 4:33 am
Something like this?
https://jensma.de/snes/index.php
I just glanced at the database and saw this.....
12983A62-8298-41F7-960E-46613FADD2FE.jpeg
While a 32kilo Byte is the same as a 256kilo Bit, for those that don’t the difference, it could lead to confusion...
by Markfrizb
Tue Nov 12, 2019 3:36 pm
Forum: NES Hardware and Flash Equipment
Topic: SNES Partially Loads Game
Replies: 13
Views: 6069

Re: SNES Partially Loads Game

Super Mario All Stars has sram detection and it could be that the SRAM in the cart is bad..... Hence, the black screen. SMWAS won't even boot if it doesn't see sram on the cart...

Maybe it's that??

Edit: maybe not after reading more of the posts.... :/
by Markfrizb
Wed Jun 12, 2019 10:11 pm
Forum: SNESdev
Topic: Wierd SNES issue
Replies: 1
Views: 4516

Re: Wierd SNES issue

Maybe the load caps for the crystal is the difference? Does it have load caps? They’d be real small, usually in the pico farrad range... probably SMT packages. I don’t really know but would be my first guess from what you described of a before and after symptoms.
by Markfrizb
Tue Apr 30, 2019 6:59 am
Forum: Reproduction
Topic: Tengai Makyou Zero / Far East of Eden Zero English Repro
Replies: 23
Views: 12970

Re: Tengai Makyou Zero / Far East of Eden Zero English Repro

The PCB used in the official cartridge is an SHVC-LDH3C-01, which was used by one -- and only one -- title: the one mentioned here. The SPC7110F appears to be a custom graphicsdecompression chip of some sort, tied to a "data ROM" of some kind, and has an additional chip that offers a battery-backed...
by Markfrizb
Fri Feb 15, 2019 1:31 pm
Forum: NES Hardware and Flash Equipment
Topic: Is SA-1 3.3v tolerant?
Replies: 10
Views: 6037

Re: Is SA-1 3.3v tolerant?

Hey Fisher,

I make a SA1 adapter pcb that uses the 5v 27c322 rom. It's clean and easy (no hand wiring). All fits inside the case. PM me for details if you're interested.
by Markfrizb
Sat Nov 03, 2018 11:31 pm
Forum: Other Retro Dev
Topic: Neo Geo AES controller port replacement?
Replies: 4
Views: 12184

Neo Geo AES controller port replacement?

Hey all,

I have an AES where someone soldered wires to all the pins of the controller ports (ruining them). No idea why they did this. Does anyone know if this connector is available thru part houses like digikey?

Lastly, I need a power brick for it. I'm looking for one of these too.

Thanks!
by Markfrizb
Tue Jul 31, 2018 9:10 am
Forum: NES Hardware and Flash Equipment
Topic: Help on level shifting with resistors
Replies: 16
Views: 7619

Re: Help on level shifting with resistors

We use these roms for years and no problems", etc... which means nothing. They're claiming exactly this! Also, the guy while trying do do a better explanation said this (translated): "The processors of the SNES are made to work at TTL tension levels, like: Low logic level from 0v to 1.8v High logic...
by Markfrizb
Tue Jul 31, 2018 7:46 am
Forum: NES Hardware and Flash Equipment
Topic: Help on level shifting with resistors
Replies: 16
Views: 7619

Re: Help on level shifting with resistors

I could figure out the "datasheet" used as reference: 19732210_1223199171140442_4714194938019949955_n.jpg Maybe he's saying that the Snes can accept 3 volt data pulses from the cart but there is NO way he can justify the overvoltage of the rom from the console. I asked for the complete one just to ...
by Markfrizb
Tue Jul 31, 2018 4:42 am
Forum: NES Hardware and Flash Equipment
Topic: Help on level shifting with resistors
Replies: 16
Views: 7619

Re: Help on level shifting with resistors

Interestingly the guy claims to have the SNES datasheet, and that it states clearly that all components are totally 3.3v tolerant. I asked him a link to see it by myself!! Edit: As I tought, the guy says it's available on the Internet and that he can't post a link to it on YT. The guy also states t...
by Markfrizb
Fri Jul 27, 2018 7:50 pm
Forum: Reproduction
Topic: x2+x3 multicart using a x2 donor.
Replies: 9
Views: 9561

Re: x2+x3 multicart using a x2 donor.

I have to admit, I'm curious why the flip flop on the pcb? To Fishers point, the correct way to integrate 3v parts is to level shift the addresslines down to 3v to protect the roms. The CX4, in effect, will upshift the datalines as it exits the CX4. I don't know if the CX4 datalines (on the roms si...
by Markfrizb
Fri Jul 27, 2018 5:03 am
Forum: Reproduction
Topic: x2+x3 multicart using a x2 donor.
Replies: 9
Views: 9561

Re: x2+x3 multicart using a x2 donor.

I have to admit, I'm curious why the flip flop on the pcb? To Fishers point, the correct way to integrate 3v parts is to level shift the addresslines down to 3v to protect the roms. The CX4, in effect, will upshift the datalines as it exits the CX4. I don't know if the CX4 datalines (on the roms sid...
by Markfrizb
Thu Jul 26, 2018 6:46 pm
Forum: Reproduction
Topic: x2+x3 multicart using a x2 donor.
Replies: 9
Views: 9561

Re: x2+x3 multicart using a x2 donor.

Fisher wrote:That's great!
Good job!
By the way, you're using level shifters, right?
Don't see any level shifters...