SHVC-1 J3M-20 Pinout Simplification

VirtualAndyVirtualAndy
in The Brewery
I found this simplified layout on the forum identified in the picture by the user Kogami. 

image



As I am having trouble figuring out differing pinout layouts from various sites like Romlab I was wondering if anyone could let me know whether this same layout could be utilized for a M27C322 eprom instead of the 27C801. Since it would be more convienient to use less eproms for space saving purposes. 



If it is not the same would anyone be able to edit this plan using the same sort of picture layout in order for it to be correct with the M27C322 eproms. I wish to use the same PCB boards or possibly J3M-11 boards.



Thank you to all, I think this would help a lot of users. I myself being a visual learner find it very helpful to see this so cut and paste so to speak. 



P.S. here is the original post in which the topic is discussed and the user Kogami posted a link to the image 

http://www.digitpress.com/forum/showthread.php?120604-Some-of-my-recent-repro-carts/page8

Comments

  • GorillazeroGorillazero
    Those are different roms initially IRC. The pinout is similar, what the difference is how the decoder is wired and the ROM files split.
  • VirtualAndyVirtualAndy
    I understand the splitting of roms would differ since those eproms are all 8 bit and the M27C322 is 16 bit, therefore a SNES game like Dragon Quest 1 & 2 would require only one M27C322 EPROM because it is only 2MB in size. Also the location of certain pins is obviously different as seen here image. So my question now is if the decoder is wired different how would it be wired? would you just ignore the oe2, oe3, and oe4 tabs in the image as there is only one eprom and match the other tabs to their correct location on the M27C322 eprom?
  • VirtualAndyVirtualAndy
    Since I hit a road block it seems with replies I decided to try and reillustrate the image myself, however it is flawed as I'm not sure where some of the connections are in relation to the eprom and pcb board as well I'm not sure if the connections I did link to are correct. Any help would be appreciated also sorry for the crudeness of the illustration.

    image
  • ol2ol2
    Here's a working diagram found through a google search



  • Moothead2Moothead2
    Why bother? For 2MB games just grab two 27C801 and a NBA 95 cart and swap bin the ROM. Much easier and a lot cleaner with less things to go wrong. For 4MB games I'd very much recommend the 29F032 TSOP way of doing it. Sure it will cost a bit more but again it's a lot less hassle and much much cleaner.
  • VirtualAndyVirtualAndy
    It does seem like a lot of extra work and wiring, in regards to your comment about using two 27c801 and the NBA 95 cart, could I instead just use a 29F016 TSOP. Since it uses the same board as the 29f032 and is half the size so less expensive for games that dont require more then 2MB? As well is their anything bigger then the 29f032 for games like Tales of phantasia? I've heard of people just using two 29f032 chips. Could you instead use x1 29f032 chip and x1 29f016 chip? 
  • Moothead2Moothead2
    If the pinout is the same I can't see why you couldn't use a 29F016, but I don't think there anything bigger that 32Mb are out there. I just use 29F032 because that's all I have.
  • VirtualAndyVirtualAndy
    I believe pin 21 on the 29f016 is a Not connected pin, which is the only difference I found between the two. Does anyone know if this would make a difference?
  • Moothead2Moothead2
    Just had a look and 29F016 seems to have 48 pins as opposed to the 40 on the 29F032 so it probably wouldn't work anyway. Even if it did you'd have to have a TSOP48 to DIP36 adapter made.
  • VirtualAndyVirtualAndy
    hmm sounds equally like a lot of extra work to have a special adapter made. All I wanted was a simple 16bit solution similar to the 29f032...
  • VirtualAndyVirtualAndy
    Wait I've found an old post featuring a user who used a 29f016 with a DIP36-TSOP40 Adapter http://www.nintendoage.com/forum/messageview.cfm?catid=22&threadid=105167
  • auptonaupton
    On a somewhat related note, I too have been recently prepping to build my first translation/reproduction cart and I'm looking for one final confirmation. For hirom games that are split into multiple 27c801 chips. Is it safe to assume that all the common pins on all 27c801 chips that do *NOT* have to be re-routed to different addresses should be soldered together?



    For example, is it safe to assume that Pin #3 on all (4) 27c801 chips should all daisy chain off of Pin #3 from the previous 27c801 ? or is it better to solder Pin #3 in this example from all (4) 27c801 chips to Pin #3 on the board's Pin #3 slot?



    I understand the re-routing of addresses, but the process which chips 1-4 are patched into the board confuses me a bit.



    Thank you in advance.
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