I/O Traps
From SpecNext official Wiki
| Number | $D8 |
|---|---|
| Readable | Yes |
| Writable | Yes |
| Short Description | experimental |
bits 7:1 = Reserved must be zero bit 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