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Hi,
Interesting find on the reset operation.
The SLRCON register was worth a shot, just in case it was marginal timing.
A couple of questions that may help narrow down the problem.
1) Have you tried different speed or brand SD card?
2) If you do not use the HDF support and only use ADFs, does the problem still occur?
3) Have you checked the silicon errata for the PIC?
Keep debugging,
Ian
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