so i want to make a xybots repro, but i cant find any tengen carts with 32 pin rom chips (since the prg rom is 128 kb). all the ones i checked have 28 pins (rbi baseball, rolling thunder). any suggestions?
How closely do the pinouts match?
You can:
-tie /OE and /CE together if necessary
-make a conversion adapter thing out of perf board
-virtually swap around address and data lines in software
since it is an unlicensed tengen game, i assumed it did not require rewiring of the eproms. is this true?
If there's room for the 32 pin chip to fit in the cart you're Ok. Just bend the socket's pins 1,2,31,32 to the side. When you solder the socket in you may want to put some electrical tape down to prevent shorts. Then just hook the bent up pins to the proper places. Of course, you have to follow the usual procedures to match up the chip's pins 3-31 to the proper places if you need to.
Not if it's a 1Mbit ROM in a 28-pin package; JEDEC 27010 are 32-pin.
Lloyd Gordon wrote:
If there's room for the 32 pin chip to fit in the cart you're Ok. Just bend the socket's pins 1,2,31,32 to the side. When you solder the socket in you may want to put some electrical tape down to prevent shorts. Then just hook the bent up pins to the proper places. Of course, you have to follow the usual procedures to match up the chip's pins 3-31 to the proper places if you need to.
yea, i dont know how to match up the chips pins 3-31 to the proper places. how do i go about doing this? i never really understood the eprom conversions (rewiring). any help would be great. thanks
I have decided to make this cart for my collection, what rewiring had to be done on this. Could someone post a picture of a finished cart.
Thanx eh
no rewiring is required, just a straight solder. you have to use skull and crossbones though
Thank you.... Ill get right on it.
I have had no luck at all tonight, this game just will not work for me I have re soldered it several times and all I get is a grey screen sometimes blue. I also got a pink screen and a green screen once.
I used a 27c512 for the CHR and a 27c010 for the PRG no pins bent all traces fine, both chips programmed and checked out fine.
Im just at my wits end on this one.
I even took my NES apart and checked the pin connector and made sure this NES had the CIC mod.
crap, im sorry that was wrong. the chr should be fine, but the PRG is wired like this:
bend up pins 1,2,24,30,31,
pin 24 to pin 22
pin 2 to hole 24
pin 30 to hole 1
that should work
Thank you I got it working now.