>The SPI mode was used to talk to the card and is straight
>forward as well.

Hmm, in the process of further researching I find that the actual binary
commands used do not seem to be disclosed anywhere. The nearest that I can
get seems to be a Sandisk Product Manual which seems to have the most info
in it, but still no binary command structure. Then there are the ACMD
series, and it is not clear if these are "tacked on the end" (binary wise)
or are the same binary value as the appropriate CMD command, but with a
different function. It does seem to describe the various status bits
however.

Did you have access to a full MMC/SD spec document, or work it out another
way?

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