(soft reset = 0)
| Bits | Description |
|---|---|
| 7:1 | Reserved must be zero |
| 0 | 1 to enable +3 FDC traps on ports 0x2ffd and 0x3ffd |
* An i/o trap generates a multiface nmi and is indicated in nextreg 0x02
* Traps cannot be triggered by the dma or while the multiface, divmmc or external nmi is active