Starfox 2 repo - Does it require 27c801-200 or will 27c801-100 work ?

auptonaupton
in The Brewery
been working on a starfox 2 repro for myself and have quadruple checked all my wires for continunity but I can't get the cart to boot... I'm using the old snesdev schematics, the only thing different is i'm using a 27c801-100F1 which works fine with non-SFX titles. I even tried writing starfox 1 to a 27c801-100F1 and that wouldn't boot either. Does anyone know if the -200 speed make all the difference ?



I'm using the PAL Winter Gold cart as it's supposed to be the fastest and yes I have swapped bin'd the rom with snestool.



Thanks!

Comments

  • Champ MastersChamp Masters
    I just recently made a Star Fox 2 repo using the snesdev schematics, just like you.

    I used a 27c801-100f1 eprom and everything worked out fine.

    The only difference is that I use a US version of Stunt Race FX for my donor cart.

    I'm not too familiar with PAL stuff or the whole swapbin method, but your issue may lie with that??

    Does your swapbin'd ROM boot up fine on an emulator?

    If it boots up on the emulator, then i don't see why it wouldn't work once you write it to the EPROM.



    Oh, BTW, I did not use SwapBin on my ROM file, and it booted up with no problems.
  • josete2kjosete2k
    200 is in ns, so -200 is slower than -100. Your eprom is ok.



    I've made some StarWing2 PAL using StuntRaceFX as a donor and all worked fine.



    Winter Gold should be fine too.
  • josete2kjosete2k
    Did you search the pinout?

    image
  • GorillazeroGorillazero




    Did you make sure the game worked before doing the repro? Check connectivity (i.e. wires and solder pads) and your wiring is going to the right legs, verify your rom boots before burning. Mine was done using the the romhacking.net hack that removes any corrupted parts of the beta rom. I used hot glue to make sure none of my wires touched or pulled out when I closed the board into the snes case.



    http://www.romhacking.net/translations/829/
  • auptonaupton
    Thanks everyone for your replies. Champ Masters may be on to something. In normal lo/hi rom conversions to 27c801 the binary needs to be swapped, which means the binary data you write to 27c801 will not run on an emulator. In this particular case if the rom is still expected to run in an emu then I suspect that the swapbin method is not needed since i'm converting from TSOP to EPROM and the pinout is very different. I'm going to test this out later tonight and report back. Thanks!
  • RetroRewiredRetroRewired
    Does anyone have the wiring diagram? http://snesdev.romhack.de/sf2.htm is 404.
  • auptonaupton
    I'll post it tonight.
  • Jon2887Jon2887
    Whenever I need to make a Star Fox 2 using a 27c801 I just swapbin it like normal and switch the 2 pins like normal. Everything else just lines up normally.
  • auptonaupton
    I tried using a non-swapped rom and that didn't work either...  Maybe the board is toast? Sigh...





  • auptonaupton
    I just traced the problem to the zif socket itself that i'm using... pins 17 and 18 are fused on the inside... note to self... don't buy cheap zif sockets... they're cheap for a reason!
  • RetroRewiredRetroRewired
    I just wanted to post the Starfox 2 I just made with that diagram. This is the first reproduction I've made, thanks for the image.







  • RetroRewiredRetroRewired
    Oh yeah, I forgot to put the battery back in haha. I'll do that now.
  • josete2kjosete2k
    Mine's:



    image



    StarWing2 in Europe using Stunt Race FX donor board. You don't need a SFX2 chip.
  • auptonaupton
    I'm fairly certain the board is fried... I've rewired it to 3 different sockets and it won't boot...



    The only possibilities are either the Winter Gold board and or SFX chip is fried, or the ROM which does work in an emu is bad. I've tried 3 different ROMS (each with different crc32/md5 checksums) all without the 512k header so I'm leaning towards the board and or chips... If anyone with a working cart can share the crc32 or md5 checksum for the file they used, that would at least let me remove one variable.



    The saga continues tonight.



  • josete2kjosete2k
    Can you post any picture of your board?
  • josete2kjosete2k
    This is a Yoshi's Island board but pinouts are the same:



    image
  • auptonaupton
    Up close it's beyond ugly and embarrassing, but it is after having to change sockets 3 times, this is deffinetely not the best display of my soldering ability... Throughout all the repeticious changes and tests I ended up lifting up pad A18 and had to re-route it directly to the leg 112 on the SFX chip directly. All pins are wired 1-to-1 except the 6 that need to be re-routed as instructued by the snesdev diagram. 



    Based on the diagram its really a simple TSOP to eprom conversion... but now it's certainly turned into a mission



  • auptonaupton
    Victory! 



    It was the Winter Gold board... I used a spare Doom cart, wired it up the same way and it works just fine... Never had a board die while working on it, I suppose there's a first time for everything. Thanks everyone!





    startfox2_victory
  • Champ MastersChamp Masters
    Nice job, glad it worked out for you! 
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