And here are the selling points for my new map (but using it will cost you nothing):

• 16-by-16 grid that holds all main opcodes
• Most instructions are displayed with their operand(s) and word/byte version
• Some less known instructions have short explanation
• Definition of the R/M field

Several features are color-coded, with special colors for:

• instruction has a R/M field
• 'reg' is the destination (for an instruction with reg and R/M operand)
• a segment register is involved
• it is a flow-control instruction
• it is a MOV
• instruction can be repeated with REP, REPZ or REPNZ
• instruction has an operation instead of register coded in the R/M field

More info about the 8086 processor is on Wikipedia.

The architect of the 8086, Stephen P. Morse, has written a book that describes the design decisions of the instruction set. You can read it online HERE.