Demul Mpr 21931: Ic501 Repack 2021

You likely need the corresponding ic501 ROM dump to match the rest of the game’s chips for Demul to recognize the set.

Here is deeply technical, repair-focused content regarding the repack. This is aimed at arcade repair technicians and advanced hardware modders. demul mpr 21931 ic501 repack

The path to the ROM/BIOS folder is not correctly set in the DEmul options. You likely need the corresponding ic501 ROM dump

#!/bin/bash # ic501_repack.sh - Convert original IC501 dump to repacked version DUMP=$1 KEY=$2 dd if=$DUMP of=header.bin bs=1 count=1024 dd if=$DUMP of=scramble.bin bs=1 skip=6720 count=256 python3 -c "import sys; data=open(sys.argv[1],'rb').read(); key=open(sys.argv[2],'rb').read(); out=bytearray([(data[i]^key[i%len(key)]) for i in range(256)]); open('repack_scramble.bin','wb').write(out)" scramble.bin $KEY cat header.bin repack_scramble.bin > ic501_repacked.bin echo "Repacked image: ic501_repacked.bin" ic501_repacked.bin echo "Repacked image: ic501_repacked.bin"