An homemade snes flashcard , you can erase and program them with a sanni card reader or compatible reader/dumper SNES

PCB finition is ENIG with chamfered connector pcb.

with sanni card reader , flash them as HIROM for less or egal to 2MB game. and flash them as EXHIROM for 2 to 4MB game.

4mb max rom size , HIROM , and 256 kbit of sram , they use mx29lv320 or mx29l3211 in SOIP-44 flashchip. Sram size can be adjusted via the switch to 64kbit or 16kbit for make it correspond to the game you want play All my sram pcb use a big smd capacitor with the sram , so without battery , the sram keep the data few minutes , you have the time to change the battery without loose your saves.

it have a pic12f629 or 675 programmed with supercic , so it allow boot on all regions ( europe / usa / asia ) , if you have a black screen just press reset for make the pic change his internal region.

games with enhancement chip will NOT work , same for LOROM one

Sanni card reader github

use the snes header database for check if lorom/hirom or if have an enhancement chip. SNES Header database

if you need a minimal device for write them , i designed one : minimal sanni card reader snes

if need a complete sanni card reader : Sanni Card READER HW3 custom build marv17