|
A
|
accumulator
|
stores the result of arithmetic
operations as well as one of the
operands
|
|
TMP
|
temporary
|
stores the second operand of
arithmetic operations
|
|
S
|
secondary
|
a temporary storage place for
accumulator values, most often
used in calculated memory
addresses for indirect loads and stores
|
|
PC
|
program counter
|
contains the address of the
next instruction in memory
to be executed.
|
|
IR
|
instruction register
|
contains the actual instruction
which is being currently executed.
|
|
MAR
|
memory address register
|
contains the address of the
memory word to be read or
written
|
|
MBR
|
memory buffer register
|
contains the value of the
word to be written into memory,
or the value of the word just
read from memory
|