I/O Traps Register

Number	TBRegisterNumber::$D8
Readable	TBRegisterReadable::Yes
Writable	TBRegisterWritable::Yes
Short Description	ShortDesc::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