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