| 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