The EMS adapter uses the .ps1 extension for PSX saves, if your PSX save is in .mcd, .vgs or .mcr format you should be able to simply rename it to *.ps1 and use it with the EMS software.
If your PSX save is in another format, such as .gme you will need to use a tool such as PSXGameEdit to convert it to Bleem (*.mcd) format and then rename it accordingly
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EMS Memory Adapter FAQ