re: buffer theories

All grist to the mill

> 4 bit parallel interface is optimised for speed (that is where the
> money is after all)

I've seen 4-bit referred to as 'native'. I think an analogy could
be '4-bit is to SPI as assembler is to BASIC'

In BillW's link, fat16lib said he was able to write audio samples
at 44k without dropping any. Unfortunately he didn't specify
whether that's 44.1k 16-bit stereo (176k4 bytes/sec). If his
write latency is a consistent ~1ms that implies, at a rough guess,
512 bytes per 2ms or 256k bytes/sec

Some smarter preparation is certainly worth looking into, even
if the maximum SPI rate is well short of 4-bit

Joe
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