Indexed addressing modes add a 16-bit extension word to the instruction.
2.
Indirect and indexed addressing could be combined at any level of indirection or indexing.
3.
Indexed addressing added 5 memory cycles ( 50 �s ) for each level of indexing.
4.
Bits are always specified by absolute addresses; there is no register-indirect or indexed addressing.
5.
The 1130 used magnetic-core memory, which the processor addressed on word boundaries, using direct, indirect, and indexed addressing modes.
6.
The addressing modes provide register, immediate, absolute, relative, deferred ( indirect ), and indexed addressing, and can specify autoincrementation and autodecrementation of a register by one ( byte instructions ) or two ( word instructions ).
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