Because .MCR and .MCD are often just raw 128KB memory card dumps, you can frequently convert them by simply changing the file extension in your file explorer. Locate your .mcr file. Right-click and select . Change the ending from .mcr to .mcd .
In the menu, choose Save As . In the “Save as type” dropdown, select Bleem! Memory Card (*.mcd) . Choose a destination folder and give the file a name. Click Save .
The software requires to run.
This is the most common raw memory card format. It is exactly 128 KB (131,072 bytes) in size, matching the precise storage capacity of an original physical PS1 memory card.
Ensure the converted file is placed in the correct directory, usually labeled saves , memcards , or bios inside your emulator's folder. The Save Data Shows as "Corrupted" In-Game mcr to mcd converter
This format is used primarily by DuckStation, the current gold standard for PS1 emulation. While it also represents a 128 KB memory card, some emulators format or index the internal headers slightly differently.
# Write chunks and calculate offsets offsets = [] current_offset = 2 # In sectors (1 sector = 4096 bytes). Header takes 2 sectors.
Some advanced converters allow you to define what 1 full circle equals in both units.
In the world of PS1 emulation, these extensions represent the "containers" that hold your game progress. Because
def read_varint(data, offset): value = 0 size = 0 while True: byte = data[offset + size] value |= (byte & 127) << (size * 7) size += 1 if (byte & 128) != 128: break return value, offset + size
In the niche world of retro gaming and software preservation, the MCR to MCD converter
Download and open (a free, open-source PS1 memory card editor). Click File > Open and select your .mcr save file.
Imagine a simple legacy rung: ---[ Start_PB ]---[ MCR ]---[ Output_Conveyor ]--- Change the ending from
Example: MCR = 1000 cells/sec, tolerance = 10 ms → CDVT = 10 cells.
If the rename trick fails, or if you need to merge, edit, or check the contents of your memory card, is the gold standard tool for retro gamers. Step-by-Step Instructions:
A warning will appear saying the file might become unusable. Click .
CDVT (cells) = MCR (cells/sec) × Tolerance_time (sec)