Memory Maps

I am working on an application that consumes the data from Retroarch. The issue that I am facing is that the memory map does not seem to reflect the ones as described with the PSX and the N64 documentation.

PSX
"KSEG1", 0xA0000000 , 0xBFFFFFFF
"KSEG2", 0xC0000000 , 0xFFFFFFFF
"KSEG0", 0x80000000 , 0x9FFFFFFF

N64
"RDRAM Memory", 0x00000000,0x03EFFFFF
"Cartridge Domain 2 Address 1", 0x05000000,0x05FFFFFF
"Cartridge Domain 1 Address 1", 0x06000000,0x07FFFFFF
"Cartridge Domain 2 Address 2", 0x08000000,0x0FFFFFFF
"Cartridge Domain 1 Address 2", 0x10000000,0x1FBFFFFF
"Cartridge Domain 1 Address 3", 0x1FD00000,0x7FFFFFFF

I have found that the memory range for "KSEG", 0x00000000 , 0x8FFFFFFF and "External SysAD Device", 0x80000000,0x80200000, when accessed will crash Retroarch.

What is the memory map that Beetle and Mupen actually uses and how is it split in Retroarch? I have tried searching through the code, but I have not been successful in locating this information effectively.

Start by searching the RetroArch source for the Beetle and Mupen core integrations and their memory-map handling, since no specific file or test is named. Compare the implemented PSX and N64 ranges with the documentation quoted in the issue, then document the actual split and clarify which ranges cause the reported crashes.