It's tough to be precisely asking when the memory of such an old purchase has vanished.
The books, they were to purchase as I did, dealt with Linux, the LPC1769 and CMSIS-DAP.
Thanks for responding
Hellmut
It was a couple of years ago and 2 HD crashes made me lose the downloaded books and the link from where to download them. One of them was Linux a 1769 ARM board.
Thanks in advance
Hellmut