The R5C592 drivers are used to interface the memory card reader hardware with Windows OS.
Ricoh Memory Stick Host Controller R5C592
File: Ricoh_Memory_Stick_32-64bit.zip
3d67dc1e18a0d155712ea0a58ac88f88fc6e4c428d2dcec0aa349d2db8555c50
Ricoh Memory Stick Host Controller R5C592/PCIe xD-Picture Card Controller
File: Ricoh-WinAll-8xx_6.10.01.05.zip
454027a8112e9ef4cdaa1e6f1d8ea81915c13bbde1fd55193f41ab3cd8a0106a
Ricoh Memory Stick Host Controller / SD/MMC Host Controller
File: Ricoh-WinAll-8xx_6.10.01.04.zip
7c939892ec1b88ebc8af7ad66de7fadb7915f9aca376403ef7de1068e1d1b807