Hello,

Recently my mircoSD card had a bit of a traumatic experience with static electricity. It is now non-functional and it's gone. So I had another idea. I would create a disk image file using dd. I have a SD to MicroSD adapter that I was using. I tore this apart and can now see the pins of the device. I want to attach those pins (microSD end) to individual wires that attach to the pins of my MicroSD-card reader for my dreamcast. Since there's no actual card there, that would just connect two card readers and wouldn't do anything. So I want to emulate a device on the laptop side, a fake microSD card that the DC microSD reader can read. I'm not all that great at explaining, but I do have a small diagram that may help:

http://imgur.com/am6UwKo

I assume that linux can access devices directly like this, but I have no clue how I would implement this. Can someone give me some pointers?

Thanks,
Dragos

As it seems, the difference between SD and microSD is just the dimensions and not the logic. I would say the form factor is the least of your problems.

An SD card is not just like memoey which you address and read out. If it were, it would be easy to connect to SD ports back to back. Like we used to connect parallel printer ports back to back. Unfortuntaly the SD protocol is much more complicated using commands and data. You might find this article interesting:
alumni.cs.ucr.edu/~amitra/sdcard/.../sdcard_appnote_foust.pdfShare

What I also don't know is how much of the logic it integrated in the SD controller and how Linux talks to that device. But that is easy to find out in the kernel module sources. Find a popular SD interface in laptops and find the modules.

jlinkels