1. Only a base register could be selected in the field selector in memory. 2. Registers 12 through 15 can be used as base registers . 3. The Level field selected a particular bank descriptor table base register ( B16-B23 ). 4. This addressing mode has a side effect in that the base register is altered. 5. They calculate the address by adding a 12-bit signed offset to a base register . 6. The base register can be used as-is with the 12-bit offsets of the loads and stores. 7. Both indirect addressing and a base register could be selected in the indirect address in memory. 8. This can be by offsets, from a pointer on the belt, or from various special-purpose base registers . 9. Index registers are used by instructions to modify the offset of the specified or assumed base register . 10. This can be by offsets from the current top-of-stack address, or by offsets from a stable frame-base register .
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