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WDM

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WDM (the initials of William David Mensch, the designer of the 65c816) is an instruction that reserves its signature byte for future expansion of the instruction set. None of these extra 256 opcodes were ever implemented, so WDM functions essentially as a two-byte NOP.

Basic Info
Addressing Mode Opcode Length Speed
42 2 byte 2 cycles
Flags Clobbered
N V M X D I Z C
. . . . . . . .

Trivia

The Labiak textbook does not describe the WDM instruction.

External Links