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XFROM is a DEV9 subsystem which consists of a flash memory attached to the [[SPEED]] chip.
XFROM was a DEV9 subsystem that consisted of a memory card flash memory attached to the SPEED chip.


It is only used in a functional state inside the [[PSX]]. In the PSX, it uses the same 8 MByte chip brand and model that is also used inside official memory cards. However, reverse engineering has shown that the driver for XFROM has code for handling chips with a capacity of 8, 16, 32, 64 and 128 MByte. [https://github.com/ps2dev/ps2sdk/blob/master/iop/dev9/extflash/src/extflash.c#L51-L57 Driver based on reverse engineering ]


SCPH-5xxxx consoles also have the drivers to access it (rom0:XFROMMAN & rom0:XFLASH) and the OSDSYS was updated to upload these drivers to the IOP and look for updates on XFROM following the same path convention that is used for memory card updates. Yet, there are no known variants of the [[Network Adaptor]] containing the compatible variant of [[SPEED]] for use on a SCPH-5xxxx console.
It was only seen in a functional state inside the PSX. It used the same chip brand and model than normal memory cards. However, the driver for XFROM has code for handling chips of 8, 16, 32, 64 and 128mb. As seen on the following [https://github.com/ps2dev/ps2sdk/blob/master/iop/dev9/extflash/src/extflash.c#L51-L57 Driver based on reverse engineering ]
 
 
SCPH-5xxxx also have the drivers to access it (rom0:XFROMMAN & rom0:XFLASH) and the OSDSYS was updated to upload these drivers to the IOP and look for updates on XFROM following the same path convention that memory card updates.
 
 
yet there was never found a compatible SPEED chip inside any of the network adapter versions
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