> Does that reader use the higher transfer rate?  Might be time to
> look at the conversation between the reader and the card.

On the scope it appears to be around 19MHz per data pin at 3.4V

I went out this evening for a look at what's available. No 4GB in
sight and a Transcend 8GB was on sale so I bought one. Worked
first time to my great relief so I'll get some more

Maybe it's just a peculiarity with 4GB. Spent too many fruitless days
on it already (and on the initial project to no avail, which is why I
ended up using the Strontium 8GB in the first place), will have to put
them on the backburner and get on with the project using 8GB. No
doubt the 8GB will be gone soon as well

The 4GB work OK in other devices so they'll get used

At some point I'd like to back-engineer the 4-bit protocol, in as
simple a form as I expect to need it

At some point

Joe


-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2015.0.5646 / Virus Database: 4284/9097 - Release Date: 02/11/15

--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.