or

The or instructions compute a bitwise and as shown in the table below. All flags are updated accordingly. Note that the carry and overflow flags are set iff (lhs | rhs)==0xff & carry_in==1 due to jankiness of the 74382's or function mode.

Instruction	Encoding	Semantics	Cycles
or acc, reg8	01 101 rrr	$\mathit{acc} \gets \mathit{acc}~\mathrm{OR}~\mathit{reg8}$	3/41/52
or acc, imm8	00 101 011 imm8	$\mathit{acc} \gets \mathit{acc}~\mathrm{OR}~\mathit{imm8}$	3

1. 4 cycles for unprefixed or acc, [pi]
2. 5 cycles for or acc, [pi] with prefix_a16 (the sequence prefix_a16; or acc, [pi] takes 6 cycles)