Noun
The symbol, quantity, or thing upon which a mathematical operation is performed; -- called also faciend.
Source: Webster's dictionaryAccumulator mode uses the accumulator as an effective address, and does not need any operand data. Source: Internet
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. Source: Internet
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. Source: Internet
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. Source: Internet
An accumulator machine has a combined left operand and result in an implicit accumulator for most arithmetic instructions. Source: Internet
An immediate operand CONST to these instructions is always sign-extended. Source: Internet