> I once was having difficulties getting a SD type card to work, i had 
> an
> electronics education type board and with its one debounced switch 
> (and
> one non debounced) i serially clocked in 135 bits of config 
> information
> and a further 2 bytes of data.
> Then i did the whole thing in reverse and got it to read back out 
> those
> same 2 bytes.
> Nothing filled my heart with greater joy than watching that little 
> LED
> flash the same sequence back at me.

My greatest similar joy, long long long ago, was seeing a 9 track tape 
jerk almost imperceptibly as one block was read, then keying through 
the processor memory with hex keypad and display and writing down what 
was there, erasing the memory (by hand - 00 00 00 00 ...), winding the 
tape back, repeating the read, reading the memory again AND finding 
that the contents were identical to the last time. ie it really WAS 
reading the mag tape OK. Many things have been far trickier than that 
but I don't think there has been a greater gee whizz moment of 
actually seeing something work for the first time. That was a hand 
assembled MC6800 program with the processor running at 1 MHz and JUST 
fast enough to handle blocks from the tape if cunning programming 
tricks were played.


        Russell



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