2.11BSD on two RL02 drives? Probably not, but...

Noel Chiappa jnc at mercury.lcs.mit.edu
Fri Aug 4 12:51:50 CDT 2017

    > From: Paul Koning

    >> do industrial SD cards exist?

    > If you have a ready-made SD interface, these cards work nicely. If you
    > need to build one from scratch it gets tricky, because the interface is
    > fairly high speed serial (packet based) signaling, and the
    > initialization sequence before you can do any I/O is fairly convoluted.

I'm not clear, reading this, if they use the standard SD-interface?

If so, yes, it's non-trivial to interface to (as I previously mentioned, Dave
and I wound up defining a uengine, and writing a uassembler to produce code
for it, after Dave decided trying to do the init with a state machine was too
much pain).

    > It is reasonably well documented in the SD standard, but still, it
    > takes a while to get all the code working. BTDT.

Tell _us_ about it! :-) (Of course, that issue we had with noise, and the
wierd latching inputs, made it even more painful...)


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