Action name: OpBinaryThis command makes the current instruction or data operand type binary. IDA always uses 123b notation for binary numbers even if the current assembler does not support binary numbers.
When you use this command, IDA deletes the manually entered operand.
If the cursor is on the first operand (the cursor is before ',') then the first operand will be affected; otherwise, all other operands will be affected.
See also Edit|Operand types|Number submenu.