I made a multi-function SNES PCB

Discussion of hardware and software development for Super NES and Super Famicom.

Moderator: Moderators

Forum rules
  • For making cartridges of your Super NES games, see Reproduction.
Post Reply
User avatar
poorstudenthobbyist
Posts: 79
Joined: Fri Jun 24, 2016 4:20 pm

I made a multi-function SNES PCB

Post by poorstudenthobbyist » Wed Jun 10, 2020 2:03 pm

I've been working on this one for a while. I don't want this to come off like an advertisement or anything, but I've seen some posts of people showing off their own boards here so I figured it was safe to post.

This board has two EPROM slots and supports SRAM up to 256 Kbit. With the EPROMs, you can make:

1) Single game with one 160/322 ("Single ROM")
2) Single game split between two 160's ("Split 160's")
3) Single game up to 64 Mbit ("ExHiROM")
4) Two games, each on their own 160/322, switching between the two with the reset button, with up to 128 KBit SRAM available to use for each ("Multicart")

Just solder the set of four pads on the back for which of these options to make! I've made a board already with sockets for all the through hole parts so I can test them before placing on a permanent board. Very handy!

Any comments on changes are welcome, as I'll be ordering more boards soon with ENIG finish and want this to be as good as it can be! Though I'm mostly looking for silkscreen changes for clarity since I'm not fond of moving traces or adding parts on a board that's already confirmed working without testing it again :D
Attachments
Back
Back
Front
Front

lidnariq
Posts: 9383
Joined: Sun Apr 13, 2008 11:12 am
Location: Seattle

Re: I made a multi-function SNES PCB

Post by lidnariq » Wed Jun 10, 2020 2:30 pm

Personally, I'd like to have labels for the various solder jumps so that I can see what's wrong when something's wrong without having to cross-reference to a schematic.

Also, are you dealing with 32K HiROM cart RAM vs 32K LoROM cart RAM? I don't think I see enough solder jumpers for that.

User avatar
poorstudenthobbyist
Posts: 79
Joined: Fri Jun 24, 2016 4:20 pm

Re: I made a multi-function SNES PCB

Post by poorstudenthobbyist » Wed Jun 10, 2020 2:55 pm

The labels are a good idea, but I wonder how legible the silkscreen will be. I'll try it out and see if it's serviceable.

And you're talking about RAM A13/A14 going to A16/A17 for HiROM? Yep, that's accounted for.

User avatar
poorstudenthobbyist
Posts: 79
Joined: Fri Jun 24, 2016 4:20 pm

Re: I made a multi-function SNES PCB

Post by poorstudenthobbyist » Wed Jun 10, 2020 6:44 pm

If you're wondering, the eighteen solder pads on the back breakdown like this:

9 for address lines A15 - BA7
2 for A13/A14 SRAM address lines
4 for SRAM decoder inputs 1A, 1B, 1G, and 2G (2A and 2B are BA5 and BA6 for both)
1 for SRAM decoder output 1Y3
1 for SRAM /CE from the decoder outputs
1 for /OE on the databus multiplexers

Post Reply