>>http://home.clear.net.nz/pages/joecolquitt/4bit_sm.jpg
>=20
> Is it a PIC32MX120F? :-)

dsPIC
=20
> The pins I use are Harwin pins originally though for prototyping vias

Nah. I'm cheap - component lead cut-offs. I'll use proper SIL pins
if it's something pluggable
=20
> Are You doing 4bit SDcard access?

Having a go. Analysis of proprietary 4-bit devices to try to back-
engineer the CMD and data structure looks promising. SPI transfers
at high speed are practical only up to a point because the card takes
longer to respond to the read command than it does to transfer the
sector requested, ie > 50% of the PIC's time is spent waiting for
data. The sector transfer can be very fast (10s of MHz) but there's
nothing that can be done about the response time in SPI mode

Giving the topic diversion some legitimacy, you would not be able to
experiment with large PICs which are in QFN or TQFP packages if
perf board was your only mounting option

Joe
--=20
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