Peter Dannegger wrote:
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The Philips data handbook IC20 is the Bible of all 8051 gurus.

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Around the office I literally refer to our Philips 8051 book as "the Bible." I just confirmed that it is the same "IC20" handbook though I've got a '98 edition...

but then again, I have my "old Bible" in my desk too: The 1978 Mostek Z80 Microcomputer System Micro-Reference Manual (34 pager pocket size). I've collected about 3 from Mostek or Zilog over the years. :)

At one time I could disassemble Z80 hex dumps in my head.

aka J --- been there, djnz that