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PostPosted: Mon May 28, 2018 10:20 am 
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Joined: Fri Dec 02, 2016 12:08 pm
Posts: 7
Hey all, I'm looking to build a dev board for trying out various SA1 ROM hacks, and I was wondering if there were any boards that wouldn't work? I've looked at all of the different PCB types, and they all seem to have slightly different variations on each other. I just want to pick up the cheapest SA1 game to modify, but one that will be the most compatible. Also, my plan is to just install a socket in place of the old ROM chip, but just rewire the necessary pins, would that be the right method?


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PostPosted: Mon May 28, 2018 10:52 am 
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Joined: Sun Apr 13, 2008 11:12 am
Posts: 7233
Location: Seattle
The only major differences between the different SA1 boards are the amount of RAM provided.

The PCB code tells you what any given board provides:
1L3B means
1 ROM
L SA-1
3 - battery-backed 8KiB SRAM (also seen: 0=none, 5=32KiB)
B - battery (also seen: N=no)
fifth digit: amount of not-battery-backed RAM
sixth digit: not-battery-backed RAM technology

Adding a socket is probably fine; the SA1 is fast compared to the rest of the SNES so avoid having a rat's nest of traces.


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PostPosted: Mon May 28, 2018 11:23 am 
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Joined: Fri Dec 02, 2016 12:08 pm
Posts: 7
lidnariq wrote:
The only major differences between the different SA1 boards are the amount of RAM provided.

The PCB code tells you what any given board provides:
1L3B means
1 ROM
L SA-1
3 - battery-backed 8KiB SRAM (also seen: 0=none, 5=32KiB)
B - battery (also seen: N=no)
fifth digit: amount of not-battery-backed RAM
sixth digit: not-battery-backed RAM technology

Adding a socket is probably fine; the SA1 is fast compared to the rest of the SNES so avoid having a rat's nest of traces.


Awesome! I didn't know the PCB codes were identifiable in this way, this definitely helps thanks! And yeah, I agree a rat's nest of wires is undesirable, my plan is to only use wires for the few pins that need to be rerouted.


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PostPosted: Fri Jun 01, 2018 7:43 pm 
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Joined: Sun Dec 02, 2012 8:17 am
Posts: 488
Location: East Texas
Really, what you'll ideally want is a 1L5B-xx where the "XX" is -11 or -12.... any number above -10. This is a 256k sram cart but can be easily expanded to 1mB sram.

Here is a dev. cart I made a while back. I upgraded the sram so it could test all games.
The rom, of course, is in a socket.

Oh, and I glued down the pcb so I wouldn't stress the adapter pins when changing roms out.


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