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This register contains the interrupt vector.
| Group Offset Read/Write |
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|
| $3F | V7 | V6 | V5 | V4 | V3 | V2 | V1 | V0 |
This byte is presented on the data bus during an interrupt acknowledge cycle. After SYSRESET this register is set to $0F, the MC680xx un-initialized vector.
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