Edit: they are available now! See last post for details.
Hey group, I'm almost finished with a project and wanted to gauge the possible interest in it.
I think one of the main issues early on was the lack of the ability to install 32mbit DIP EPROMs (or bigger) inside the carts. Thus, the tsop adapter was a great solution (still is). A friend not long ago opened my eyes to the 27c322. They are cheap to buy, easy to program but they are massive and 16bit. Now with this adapter, they are easy.
This is a pcb that marries itself to the 1A3M (Lo rom) and 1J3M (Hi rom) carts and allows the use of 2 (yes two) of the massive 27c322 42 pin dip EPROMs. Both EPROMs can sit in sockets AND the cart shell closes normally. So it all fits neatly inside.
Here are the highlights:
This marries to the back side of a carts existing pins (see below pic). No need to remove the mask rom. The only hand wiring to do is to disable the mask rom by cutting its CE leg and tying it high to a 5v point.
Can be used with regular hi or lo rom boards
Can use it for the ExHiRom games too. (Tales of P, super Demo world, etc)
The nice aspect of this pcb is the sockets for the roms.
And yes, it will all fit inside the case (NTSC CASE. Haven't tried the SFC case)
EDIT: will fit in a SFC case too
The above pic shows a lo rom cart and I used headers to mount the pcb (so I removed the mask rom on this install).
This pcb has the 16bit to 8bit conversion IC's as well as a decoder (74xx139) for the ExHiRom games.
The roms don't have to be programmed in any special way. Just normal rom programming.
There are a few "SL" pads that you can solder jumpers to determine if its lo rom or hi rom or the ExHiRom. And there is also a selection for 27c160 EPROM usage too.
For the smaller games (27c160), the 29F1615 is a great flash rom to use. DIP package, cheap, fast program.
I made this to be a "anyone can do this" type of pcb. Yes, I know of the Buy-IC service using the Tsop flash roms. But what if the average guy with cheap programmer and average soldering skills doesn't have the necessary adapters to reprogram the tsop's? Just about every programmer on planet earth can program the 42 pin dip EPROMs. And with the socketed roms, just reprogram if you make a mistake on xxxxxx whatever game you are modding or translating, home brewing, etc.
There are 4 ic's and 6 caps. With a pencil tip iron, I have been able to solder the parts on with no trouble. The headers for socket use sink all the way to flush (note the BIG holes). This is why the roms and sockets can fit inside the case.
The remaining circuitry you see on the board is for future expansion and reset for game cycling.
With the reset button, you can now cycle through a variety of multi-game options. Anywhere from 16 games in 1 to a 2 games in 1. It just depends on how you want to stack your rom data.
The future expansion part is a work in progress.... But I'm hoping to get a tsop48/56 adapter made so that I can bank 4 x 32mbit games or more.... With an appropriate size tsop flash rom.
As I near the completion of this, I'm wanting to see how many of these I need to manuf. If there is enough interest, I may just have the fab house mount the parts. I don't want to do assembly... At least not on a mass scale.
I'll post a video sometime soon.
Thanks for looking!
Edit: the multi game feature works now using the reset to cycle between the games.
Hey group, I'm almost finished with a project and wanted to gauge the possible interest in it.
I think one of the main issues early on was the lack of the ability to install 32mbit DIP EPROMs (or bigger) inside the carts. Thus, the tsop adapter was a great solution (still is). A friend not long ago opened my eyes to the 27c322. They are cheap to buy, easy to program but they are massive and 16bit. Now with this adapter, they are easy.
This is a pcb that marries itself to the 1A3M (Lo rom) and 1J3M (Hi rom) carts and allows the use of 2 (yes two) of the massive 27c322 42 pin dip EPROMs. Both EPROMs can sit in sockets AND the cart shell closes normally. So it all fits neatly inside.
Attachment:
The attachment image.jpg is no longer available
Here are the highlights:
This marries to the back side of a carts existing pins (see below pic). No need to remove the mask rom. The only hand wiring to do is to disable the mask rom by cutting its CE leg and tying it high to a 5v point.
Can be used with regular hi or lo rom boards
Can use it for the ExHiRom games too. (Tales of P, super Demo world, etc)
The nice aspect of this pcb is the sockets for the roms.
Attachment:
And yes, it will all fit inside the case (NTSC CASE. Haven't tried the SFC case)
EDIT: will fit in a SFC case too
Attachment:
The above pic shows a lo rom cart and I used headers to mount the pcb (so I removed the mask rom on this install).
This pcb has the 16bit to 8bit conversion IC's as well as a decoder (74xx139) for the ExHiRom games.
The roms don't have to be programmed in any special way. Just normal rom programming.
There are a few "SL" pads that you can solder jumpers to determine if its lo rom or hi rom or the ExHiRom. And there is also a selection for 27c160 EPROM usage too.
For the smaller games (27c160), the 29F1615 is a great flash rom to use. DIP package, cheap, fast program.
I made this to be a "anyone can do this" type of pcb. Yes, I know of the Buy-IC service using the Tsop flash roms. But what if the average guy with cheap programmer and average soldering skills doesn't have the necessary adapters to reprogram the tsop's? Just about every programmer on planet earth can program the 42 pin dip EPROMs. And with the socketed roms, just reprogram if you make a mistake on xxxxxx whatever game you are modding or translating, home brewing, etc.
There are 4 ic's and 6 caps. With a pencil tip iron, I have been able to solder the parts on with no trouble. The headers for socket use sink all the way to flush (note the BIG holes). This is why the roms and sockets can fit inside the case.
The remaining circuitry you see on the board is for future expansion and reset for game cycling.
With the reset button, you can now cycle through a variety of multi-game options. Anywhere from 16 games in 1 to a 2 games in 1. It just depends on how you want to stack your rom data.
The future expansion part is a work in progress.... But I'm hoping to get a tsop48/56 adapter made so that I can bank 4 x 32mbit games or more.... With an appropriate size tsop flash rom.
As I near the completion of this, I'm wanting to see how many of these I need to manuf. If there is enough interest, I may just have the fab house mount the parts. I don't want to do assembly... At least not on a mass scale.
I'll post a video sometime soon.
Thanks for looking!
Edit: the multi game feature works now using the reset to cycle between the games.