DIY SD Card Reader: Serial Port Interface Source?

[alvin777]

Hi. I currently have parts for making the SD Reader for the Dreamcast (all except the metal film resistor 470 ohms 0.6w - any idea which used gadget I can get this from? The stores here in my country don't have it and expensive to import), you could source the SD card reader interface (the pins) from a cheap multiple SD card reader but where can you source DIY serial port interface for the Dreamcast?

Thank you in advance.

God bless, Rev. 21:4