@PaulRB Thank you.
I tried to order some TPIC6B595 but find different types : TPIC6B595N ** or without the "N" ? And find SIPO (serial in parallel out) or PISO, PIPO or SISO. Which one do I need ?
I read most of the posts on the net about the same problem I have to better understand what I'm doing. In one discussion I read that if you need to move the steppers in one direction only, then you could use A4988 drivers hooking up all DIR signals to GND or 5v (thus saving pins) along with a multiplexer, but it didn't explain how.
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