operand
Noun
Meaning
The symbol, quantity, or thing upon which a mathematical operation is performed; -- called also faciend.
Source: Webster's dictionarySynonyms
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Accumulator mode uses the accumulator as an effective address, and does not need any operand data.
Addressing modes could involve up to two displacements and two memory indirections per operand as well as scaled indexing, making the longest conceivable instruction 23 bytes.
B also introduced the increment and decrement operators (++ and --); Their prefix or postfix position determines whether the value is taken prior or post alteration of the operand.
An interesting side effect of this implementation is that a program can store a 64-bit value (the longest operand format) to memory while in one endian mode, switch modes, and read back the same 64-bit value without seeing a change of byte order.
An accumulator machine has a combined left operand and result in an implicit accumulator for most arithmetic instructions.
An immediate operand CONST to these instructions is always sign-extended.