In SX Microcontrollers, SX/B Compiler and SX-Key Tool, kgracey wrote:

Hello Eduardo,

There was a period of time in the early SX production [which I remember] that involved changes that affected debugging and/or comparator functionality. This was probably back in 1997 or so. My recollection is that there were very few of these on the market. That was a long time ago and memory fades.  

Scenix used a more extensive date code as you pointed out. This date code should be printed on the chip package, most likely silk-screened (not laser printed, like the Parallax versions). 

Ask the supplier for the date code on the chips, post it here and I'll research our files for more information. It's possible that they'd program but not debug, in which case the SX-Blitz should work. Whatever you do, get a handful of them before you buy the whole lot. 

Better yet, spend a few extra dollars and buy them from Parallax and you know they'll work.

Sincerely, 

Ken Gracey
Parallax, Inc.

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