SFC graphical issues(video included)

Nope, not a bad idea. I use them but as I said, big hole in the back of the cart

Pinouts are usually what causes differences between EPROM and EEPROM chips, some are similar and require very little rewiring. I think for the SNES / SFC the 27C080 for example needs a couple of legs on the EPROM lifted and rewired to match a SNES MaskROM. I think I have one sitting on my desk if you want a photo of what it would look like.

 

If rewiring would be needed it seems optimal to get a perfboard and then run some wire between it and the cart. Not exactly elegant but seems a ton simpler than trying to rewire a chip. You don't happen to know of a chip that can just be dropped in do you?

Edit: Actually if I use the same type of chip I could rewire the board traces without too much work I imagine.

 

Only MaskROMs can be dropped in, Nintendo went the non-standard route with their chips - probably to try and prevent the exact thing we are trying to do

27C801 is the chip I have here two legs get swapped over, that's much easy Found some photos of when I gave it a shot. Turned out well, hope the photos give you some idea on what needs to be done, for the 27C801 at least. I'm not sure how SNES / SFC ROMs need to be padded if there's excess space on the end, whether the data on the ROM needs to be repeated over and over until full or if it just reads from the beginning.

Here's the photos, hot off the upload. If you want I could do a rundown on the entire process if you want me to.

 

Am

Am I mistaken or could you have left the legs straight and cut the traces and run your own trace on the board(using those same 2 wires) so you could swap out chips as much as you want without redoing this mod every time?

 

Yep, that would work, my endgame was getting a TSOP40 32Mbit AM29F032B working though, not a 8Mbit 27C801. It was more to check that my progress was headed in the right direction. The TSOP40 PCB (Type II) is already wired to work as a drop in replacement for a SNES MROM, so I didn't cut any more traces. In theory you could slap in a switch and toggle between 27C801s and MROMs.

When you bundle all the costs together though, wouldn't a flash cart be a far better way to run this test ROM? (That is still your own endgame right?) If you aren't concerned with cost, go for the EPROM route, it's a great way to learn at the very least.

 

I have a few endgames. Yes I want to run this test rom. And be able to run games.(I know that I'm far more limited in compatibility using Mario Paint instead of SD2SNES) Improving my EE skills is a plus.

ZIF 2USD
Mario Paint 7USD
EPROM 3USD
Programmer 41USD
53USD total unless I'm missing something

SD2SNES 200USD

SD2SNES is also out of stock there but if it weren't am I missing something that makes SD2SNES cheaper?

So my partner said she would approve of a Super Everdrive which is about 80. Kinda a happy medium. Is that a good cart?

 

Why not both? How could you regret having so many cool gadgets?

Ahh yes, I was looking at the Super EverDrive before sorry, not the SD2SNES. I can't say I've used the Super EverDrive, but I can say that I have an SD2SNES (I haven't used it yet though...). Best bet might be to post a new thread enquiring about the Super EverDrive, I'm sure there's got to be some folk on here who have it!

I'd also fire up another thread about a decent programmer, from past experience though the PCB50B didn't get much praise from others. Maybe that has changed, it's a new age we live in!

 

Lol the reason not to have so many gadgets is that my family has 1k/month income. not much to be splurging with.

 

Oh boy do I know the feeling - I splurged instead of having a family, it's the only way! Are you time rich perhaps? If you have plenty of time on your hands I'd definitely go the EPROM route.

Don't forget you'll need a UV EPROM eraser too! I'd be curious to see what people recommend for a low end EPROM programmer. I noticed the Mini Pro TL866 (which seems to be quite popular these days) doesn't do 27C801 chips but does do 27C080 chips. It is satisfying to make your own EPROM, but a flash cart wins on convenience!

 

Definitely time rich. This here is what my days consist of I'm a stay at home parent who dabbles to fill school time.

 

Lucky! Sounds pretty awesome to me! EPROM, EPROM, EPROM!

 

You can program the 27c801 on the tl866. Just select the 27c080 and turn off device id check.

 

I wonder why they don't slap it in their support device list then? Surely it would be advantageous to have more chips than less right? Thanks for the hint, I'll add that on my list of magic hints!

 

Yes there are loads of chips not on the tl866 software that just needs same programming algorithm but different id check value. Should be trivial for them to do.

 

I'll hafta grab that later. Ended up ordering the Everdrive. Can't wait to have access to 25% of games. I decided It would be better to order the Everdrive and have it in less than 2 weeks and get this problem debugged rather than waiting on the individual pieces of the kit to arrive then building it myself. Plus his shells work on both systems so I can use the ED without shell swapping.

 

Well that's a winner then! How long does shipping take within the states? Pretty zappy?

 

The quote said about 7-15 days.

 

Got http://www.ebay.com/itm/5PCS-SN74LV...953326?hash=item2ca6f9daae:g:1EgAAOSwX~dWpxIY in. Now just waiting for http://www.ebay.com/itm/like/250851844356?ul_noapp=true&chn=ps&lpid=82 to arrive and I'll be ready to build my SNES bot.

 

Did you not get an MCP23017?

 

Does not seem so. The two chips I ordered are what I was told was needed by someone I was discussing the project with. They are the first chips I've ever ordered so just took their word for it. Should I order one of those?