I got a Pirate, not working, Super Mario Kart.
After doing some tests, I tried to read it. Got only FF's...
So, the ROM was bad. I changed the epoxy blob for a flash and bang! Worked.
I had some very weird rendering issues, wich were surprisingly solved by disconnecting pins 14 and 28 from the bootleg DSP-1.
So far so good. I noticed it didn't have a save battery.
After adding a 16kb SRAM to the mix, using this circuit as reference I ended with this: The circuit I used for the battery is:
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1K -Batt+--->|----/\/\----+--IC Vcc | 1N4148 | GND | Console's --->|--+ Vcc 1N4148
Does it makes sense?
I saw in some circuits a transistor on the SRAM's /CS pin but one showed it connected to /RESET pin and other to a specific MAD pin.
Is it really necessary? Won't I be continously losing the saves?
Thanks in advance