Page 1 of 1
Creative 72-Pin cart to Famicom adapter project
Posted: Wed Jan 08, 2020 7:51 pm
by Ben Boldt
I have been working on an adapter to put 72-pin carts in a Famicom. I wanted it to mechanically key everything to prevent anything backwards. I still need to make all connections, but I think it is looking pretty cool, so I thought I would share:
Re: Creative 72-Pin cart to Famicom adapter project
Posted: Thu Jan 09, 2020 12:15 am
by TmEE
Those "teeth" on top look nice lol
Re: Creative 72-Pin cart to Famicom adapter project
Posted: Fri Jan 10, 2020 2:17 pm
by Ben Boldt
Question for you guys actually, I had not considered this until now. This adapter would leave unconnected inputs to the CIC chip in the 72-pin cart:
Code: Select all
-------
+5V -- |36 72| -- GND
CIC toMB <- |35 71| <- CIC CLK
CIC toPak -> |34 70| <- CIC +RST
I put 10k pull-ups on pins 34, 70, and 71. Does that sound like the right thing to do?
Re: Creative 72-Pin cart to Famicom adapter project
Posted: Fri Jan 10, 2020 2:21 pm
by lidnariq
Don't need to care. The CIC in the NES doesn't do anything (other than the lock asserting RESET on the PPU and CPU), and nothing checks if it's working.
Additionally, the SM590 uses dynamic logic, so it'll crash a couple ms after it powers up without a clock anyway.
Re: Creative 72-Pin cart to Famicom adapter project
Posted: Fri Jan 10, 2020 2:40 pm
by krzysiobal
Those pins from black cartridge connector can easily become loose and ultimately go deep inside plastic when not soldered into PCB.
Especially if this is currently produced 60/72 pin connector made in people republic of china.
Re: Creative 72-Pin cart to Famicom adapter project
Posted: Fri Jan 10, 2020 3:00 pm
by Ben Boldt
krzysiobal wrote: ↑Fri Jan 10, 2020 2:40 pm
Those pins from black cartridge connector can easily become loose and ultimately go deep inside plastic when not soldered into PCB.
Especially if this is currently produced 60/72 pin connector made in people republic of china.
Oh crap.........
Yes this is a China 2.50mm 72-pin connector. I don't have any PCB it can solder to unfortunately. Well I guess I better use it sparingly.
Here was an earlier prototype (on left side), it was too hard to pull out the cartridge, due to almost nowhere to grab onto the cartridge:
I think it has an interesting 1990s geometric style to the newer one.
lidnariq wrote: ↑Fri Jan 10, 2020 2:21 pm
Don't need to care. The CIC in the NES doesn't do anything (other than the lock asserting RESET on the PPU and CPU), and nothing checks if it's working.
Additionally, the SM590 uses dynamic logic, so it'll crash a couple ms after it powers up without a clock anyway.
Okay, good to know thanks.
Also, just as a note, this adapter has nothing to do with 3.3V translation we were talking about in the other thread, it is entirely different/new project, only intended to put a 72-pin cart in a 60-pin Famicom.
Another note, for the preservationists out there, this cart had gone for a swim at some point in its life, because it has a water-damaged label and the PCB had pretty bad corrosion.