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

A few years [late 90s] back NASA was looking for 8088 processors to re-supply their in-use space shuttle computer systems.  They may not yet be ready for you Guenther.

But this surely demonstrates that a lot can be done with very little.  In this case, I suspect the shift registers are absolutely not needed and that one would learn a lot more by choosing the matrix approach.

I too appreciate the minimalist approach [it frees up a lot of building time] but pjv thinks at light speed.  I have his RTO system up and running here [has been reliable for months], but without any introductory material on multiple threads it took months for me to begin to understand it.  

In this case, the LED matrix is a much simpler concept to understand, but a lot of people don't grasp that you can turn on and off groups of I/O in a systematic fashion.  Adding that the scan must shift from 3 row of 8bits to one row of 3bits, isn't a good confidence builder for a newcomer.

All my problems in teaching always become resolved by getting down to the student's level.  Lower the learning curve and more will follow.

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